@article{2-s2.0-85163973009,

title = {Phosphate Petrochronology of the Belcina REE Mineralization (Ditrău Alkaline Massif, Romania)},

author = { U. Klötzli and J. Burda and P. Ţibuleac},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85163973009&doi=10.3390%2fmin13060739&partnerID=40&md5=48b9b0827e1df5b828953631baf0a9d2},

doi = {10.3390/min13060739},

issn = {2075163X},

year  = {2023},

date = {2023-01-01},

journal = {Minerals},

volume = {13},

number = {6},

publisher = {MDPI},

abstract = {A notable REE mineralization in Europe is associated with the Ditrău Alkaline Massif (DAM) in the Eastern Carpathians (Romania). It is an expression of the latest hydrothermal phase in the DAM and is found in the form of mineralized carbonate veins cross-cutting the complex in the NW (Jolotca region) and the SE (Belcina region) parts of the DAM. In the Belcina veins monazite-(Ce), xenotime-(Y) and apatite, together with Fe-Mg-rich carbonate, thorite, thorogummite, gedrite and plagioclase are rock-forming. Three different textural and chemical types of the monazite-(Ce) and the xenotime-(Y) document a three-stage evolution. The relative phosphate age succession (from older to younger) thereby is xnt1 > xnt2 (>)+ mnz1 + Fe2O3 + Fe-gedrite > mnz2 + Fe-dolomite (+ plagioclase) > mnz3 + xnt3 + apatite. Phosphate chemistry shows that these crystallized from hydrothermal fluids, whereby each phosphate type follows a separate evolutionary path suggesting growth from (at least) three independent and successive hydrothermal fluids. Chemistry and pathways within the DAM suggest that these hydrothermal fluids could be derived from a subsurface carbonatitic intrusion. Mnz1,2 and xnt1,2 ages are tightly clustered at 215.8 ± 0.7 Ma (Norian; Upper Triassic). The third-generation phosphate ages are younger, but are associated with large analytical uncertainties and did not deliver geologically useful ages. The mean age of ca. 216 Ma is interpreted as the timing of the Belcina REE mineralization, which together with the fluid chemistry, supports a model of the presence of a late-stage, independent carbonatitic intrusion about 10 Ma after the main igneous activity (ca. 235–225 Ma) forming the DAM, synchronous with extension-related magmatism in the region. © 2023 by the authors.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85130772072,

title = {Petrochronological Evidence for a Three-Stage Magmatic Evolution of the Youngest Nepheline Syenites from the Ditrău Alkaline Massif, Romania},

author = { U. Klötzli and J. Burda and Q.L. Li and Y. Liu and G. Jakab and L. Ionescu and P. Ţibuleac},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85130772072&doi=10.3390%2fmin12050657&partnerID=40&md5=2e7191e73b65ea2e2abfb341bd25a616},

doi = {10.3390/min12050657},

issn = {2075163X},

year  = {2022},

date = {2022-01-01},

journal = {Minerals},

volume = {12},

number = {5},

publisher = {MDPI},

abstract = {The Ditrău Alkaline Massif (DAM) is an igneous massif in the Eastern Carpathian Mountains of Romania. Numerous geochronological and geochemical studies have proposed a long formation history (ca. 70 m.y.) of the DAM from Middle Triassic to Cretaceous times, which is hardly reconcilable with geochemical evolutionary models and the geotectonic environment during the Mesozoic in this part of the Eastern Carpathian Mountains. In order to put tighter age constraints on the igneous processes forming the DAM, two nepheline syenites from the so-called Ghiduţ and Lăzarea suites were investigated. Based on field and geochemical evidence, the two rock suites represent the younger part of the DAM intrusives. Detailed zircon characterization, in situ zircon SIMS U-Pb dating, and geochemical modelling were used to establish the timing of zircon crystallization and thus to set time constraints on the igneous formation of these parts of the DAM. The intrusion of the dated Ghiduţ suite sample took place at 232 ± 1 Ma in the Karnium, whereas the Lăzarea suite nepheline syenite sample was intruded at 225 ± 1 Ma in the Norium. Together with published geochemical and geochronological data, three different magmatic events can thus be identified: Ghiduţ suite at 231.1 ± 0.8 Ma, Ditrău suite at 230.7 ± 0.2 Ma, and Lăzarea suite at 224.9 ± 1.1 Ma. Although the ages of the events 1 and 2 are statistically indistinguishable, the combination of geochemical and petrochronological data certainly favor independent intrusion events. Thus, the igneous events forming the younger parts of the DAM encompassed a time span of ca. 13 m.y. Additionally, each igneous event can tentatively be divided in an older syenitic stage and a younger nepheline syenitic one, each with an age difference of some 100,000 years. No indication of any post 215 Ma igneous or hydrothermal activity was found. The new data and interpretation significantly improve our understanding of the temporal and geochemical evolution of the DAM and of alkaline complexes as such, demonstrating that the underlying igneous processes (melt generation; assimilation; fractionation; and the duration of plumbing systems) work on the same time scale for both sorts of magmatic rock suites. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.},

note = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85099243883,

title = {Tracing proto-Rheic - Qaidam Ocean vestiges into the Western Tatra Mountains and implications for the Palaeozoic palaeogeography of Central Europe},

author = { J. Burda and U. Klötzli and J. Majka and D. Chew and Q.L. Li and Y. Liu and A. Gawęda and M. Wiedenbeck},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099243883&doi=10.1016%2fj.gr.2020.12.016&partnerID=40&md5=e784fb89951c2e31c70d4b4aee664d33},

doi = {10.1016/j.gr.2020.12.016},

issn = {1342937X},

year  = {2021},

date = {2021-01-01},

journal = {Gondwana Research},

volume = {91},

pages = {188-204},

publisher = {Elsevier Inc.},

abstract = {Zircon petrochronology from amphibolites and retrogressed eclogites from the basement of the Western Tatra Mountains (Central Western Carpathians) reveals a complex rock evolution. An island-arc related basaltic amphibolite from Žiarska Valley shows three distinct zircon forming events: igneous zircon growth at ca. 498 Ma (Middle/Late Cambrian) and two phases of amphibolite-facies metamorphism at ca. 470 Ma (Early Ordovician) and at ca. 344 Ma (Early Carboniferous). A retrogressed eclogite from Baranèc Mountain records two zircon forming events: metamorphic zircon growth under eclogite-facies conditions at ca. 367 Ma (Late Devonian) and amphibolite-facies metamorphism at ca. 349 Ma (Early Carboniferous). These data contribute towards understanding and correlating major tectonothermal events that shaped the eastern margin of Gondwana in the Early Palaeozoic and its subsequent Variscan evolution. The metabasites record vestiges of two completely independent oceanic domains preserved within the Central Western Carpathians: (1) An Ediacaran to Cambrian oceanic arc related to the proto-Rheic - Qaidam oceans and metamorphosed to amphibolite-facies in the Early Ordovician subduction of the proto-Rheic - Qaidam arc during the Cenerian orogeny (ca. 470 Ma) and (2) Late Devonian oceanic crust related to a back-arc basin (Pernek-type), formed by the opening of the Paleotethys and metamorphosed to eclogite-facies during Devonian subduction (ca. 367 Ma). The common Variscan and later evolution of these oceanic remnants commenced with amphibolite-facies metamorphic overprinting in the Early Carboniferous (amphibolite: ca. 344 Ma; retrogressed eclogite: ca. 349 Ma) related to an Early Variscan consolidation and the formation of Pangea. None of the investigated rocks of the Central Western Carpathians show any evidence of being chronologically or palaeogeographically related to the Rheic Ocean, therefore any prolongation of the Rheic suture from the Sudetes into the Alpine-Carpathian realm is highly problematic. Instead, the Southern and Central Alpine Cenerian orogeny can be traced into the Central Western Carpathians. © 2020 International Association for Gondwana Research},

note = {12},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85089480016,

title = {Inherited or not inherited: Complexities in dating the atypical ‘cold’ Chopok granite (Nízke Tatry Mountains, Slovakia)},

author = { J. Burda and U. Klötzli and B. Woskowicz-Ślęzak and Q.L. Li and Y. Liu},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85089480016&doi=10.1016%2fj.gr.2020.05.018&partnerID=40&md5=730aa12e0acef16529067cec349f5468},

doi = {10.1016/j.gr.2020.05.018},

issn = {1342937X},

year  = {2020},

date = {2020-01-01},

journal = {Gondwana Research},

volume = {87},

pages = {138-161},

publisher = {Elsevier Inc.},

abstract = {Zircon U-Pb SIMS dating combined with in-context (in thin section) monazite and xenotime U + Th-total Pb dating was used to clarify the Palaeozoic evolution of the ‘cold’ Chopok granite (Nízke Tatry Mountains; Slovakia). Four distinct zircon, monazite and xenotime age domains testify to a prolonged evolution from igneous formation to multi-stage metasomatism and hydrothermal overprinting. The geological interpretation of age patterns from ‘cold’ granites, expected to have low zircon saturation temperatures (<800 °C) and relatively high amounts of zircon inheritance, requires special care, especially for what concerns proper attribution of zircon inheritance and igneous growth ages. These issues can be resolved using zircon saturation temperatures (TZrn) as proxy for the amount of zircon inheritance in combination with the temperature differences between TZrn and the granite solidus. In this respect, the Chopok granite is an atypical ‘cold’ granite. Due to TZrn being substantially lower (ca. 80 °C ± 50 °C) than the granite solidus temperature, practically no zircon inheritance was found. The zircon age data indicates that the Chopok granite is a product of an Early Ordovician (475.8 ± 3.3 Ma) magmatic event, corresponding with the widespread Early Palaeozoic magmatism recorded throughout the European Variscan belt. This is further corroborated by phosphate mineral ages. The post-magmatic activity recorded in the U-Pb systematics of zircon and phosphates overgrowths can be related to the different phases of the evolution of the Variscan orogen: Early Carboniferous (ca. 352 Ma) metasomatism documents the main Variscan orogenic event, whereas the Permo-Triassic age (ca. 255 Ma) reflects thermo-tectonic activity associated with large-scale crustal extension, contemporaneous with the initial continental leading to the break-up of Pangea. © 2020 International Association for Gondwana Research},

note = {5},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85062604031,

title = {Cadomian protolith ages of exotic mega blocks from Bugaj and Andrychów (Western outer Carpathians, Poland) and their palaeogeographic significance},

author = { J. Burda and B. Woskowicz-Ślęzak and U. Klötzli and A. Gawęda},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062604031&doi=10.1515%2fgeochr-2015-0102&partnerID=40&md5=7883f55ecfe71091daaffd896692c601},

doi = {10.1515/geochr-2015-0102},

issn = {17338387},

year  = {2019},

date = {2019-01-01},

journal = {Geochronometria},

volume = {46},

number = {1},

pages = {25-36},

publisher = {Sciendo},

abstract = {This study presents the first zircon U-Pb LA-MC-ICP-MS ages and whole-rock Rb/Sr and Sm/Nd data from exotic blocks (Bugaj and Andrychów) from the Western Outer Carpathians (WOC) flysch. The CL images of the zircon crystals from both samples reveal typical magmatic textures characterized by a well-defined concentric and oscillatory growth zoning. A concordia age 580.1 ± 6.0 Ma of the zircons from the Bugaj sample is considered to represent the crystallization age of this granite. The zircon crystals from the Andrychów orthogneiss yield an age of 542 ± 21 Ma, interpreted as the uppermost Proterozoic, magmatic crystallization age of the granitoid protholith. The initial (at ca. 580 Ma) 87 Sr/ 86 Sr ratios of the Bugaj granitoids (0.72997 and 0.72874) are highly radiogenic, pointing to the assimilation of an older, possibly strongly Rb enriched source to the Bugaj melt. The Nd isotope systematics (ϵ Nd580 -1.4 and 0.4) also point to a significant contribution of such a distinct mantle source. On the basis of the sequence of magmatic events obtained from U-Pb zircon ages, we suggest that exotic mega blocks deposited to the WOC basins were related to the Brunovistulicum Terrane. They belong to the group of Vendian/Cambrian granitoids representing the latest, posttectonic expression of the Cadomian cycle. © 2018 J. Burda et al, published by Sciendo.},

note = {8},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85077840927,

title = {Continuous magma mixing and cumulate separation in the High Tatra Mountains open system granitoid intrusion, Western Carpathians (Poland/Slovakia): A textural and geochemical study},

author = { A. Gawęda and K. Szopa and R. Włodyka and J. Burda and Q. Crowley and M. Sikorska},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077840927&doi=10.24425%2fagp.2019.126447&partnerID=40&md5=698c07c81d3e61a8c8e2eb1056cd7fbc},

doi = {10.24425/agp.2019.126447},

issn = {00015709},

year  = {2019},

date = {2019-01-01},

journal = {Acta Geologica Polonica},

volume = {69},

number = {4},

pages = {549-570},

publisher = {Polish Academy of Sciences},

abstract = {In this study the formation of the polygenetic High Tatra granitoid magma is discussed. Felsic and mafic magma mixing and mingling processes occurred in all magma batches composing the pluton and are documented by the typical textural assemblages, which include: mafic microgranular enclaves (MME), mafic clots, felsic clots, quartz-plagioclase-titanite ocelli, biotite-quartz ocelli, poikilitic plagioclase crystals, chemically zoned K-feldspar phenocrysts with inclusion zones and calcic spikes in zoned plagioclase. Geochemical modelling indicates the predominance of the felsic component in subsequent magma batches, however, the mantle origin of the admixed magma input is suggested on the basis of geochemical and Rb-Sr, Sm-Nd and Pb isotopic data. Magma mixing is considered to be a first-order magmatic process, causing the magma diversification. The cumulate formation and the squeezing of remnant melt by filter pressing points to fractional crystallization acting as a second-order magmatic process. © 2019 Polish Academy of Sciences. All rights reserved.},

note = {4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85043779838,

title = {Variscan post-collisional cooling and uplift of the Tatra Mountains crystalline block constrained by integrated zircon, apatite and titanite LA-(MC)-ICP-MS U-Pb dating and rare earth element analyses},

author = { A. Gawęda and K. Szopa and D. Chew and G.J. O'Sullivan and J. Burda and U. Klötzli and J. Golonka},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85043779838&doi=10.1016%2fj.chemgeo.2018.03.012&partnerID=40&md5=9dac9b7086008c706e17d681280bebc6},

doi = {10.1016/j.chemgeo.2018.03.012},

issn = {00092541},

year  = {2018},

date = {2018-01-01},

journal = {Chemical Geology},

volume = {484},

pages = {191-209},

publisher = {Elsevier B.V.},

abstract = {LA-ICP-MS U-Pb dating of apatite, titanite and zircon from the metamorphic cover of the Western Tatra granite was undertaken to constrain the timing of metamorphic events related to the final stages of Variscan orogenesis and subsequent post-orogenic exhumation. Zircon was found only in one sample from the northern metamorphic envelope. U-Pb ages from the outermost rims of zircons define a concordia age of 346 ± 6 Ma, while the inner rims yield a concordia age of 385 ± 8 Ma. Apatite from three samples from the northern metamorphic envelope yield U-Pb ages of 351.8 ± 4.4 Ma, 346.7 ± 5.9 Ma and 342.6 ± 7.1 Ma. Titanite from an amphibolite from the southern metamorphic envelope yields a U-Pb age of 345.3 ± 4.5 Ma. The age of c. 345 Ma is interpreted to represent the climax of metamorphism and the onset of simultaneous exhumation of the entire Tatra Mountains massif, and is recorded mainly in the northern part of the metamorphic cover. In the southern metamorphic envelope, distinct populations of apatite can be recognized within individual samples based on their rare earth element (REE) and actinide contents. One population of apatite (Ap1) yields a relatively imprecise U-Pb age of 340 ± 31 Ma. This population comprises apatite grains with very similar trace element compositions to apatite in the northern amphibolite samples, which suggests they crystallized under similar metamorphic conditions to their northern counterparts. A second apatite population (Ap2) yields an age of c. 328 ± 22 Ma, which is interpreted as neocrystalline apatite that formed during a late-Variscan (hydrothermal?) process involving (P; F; Ca; REE)-rich fluid migration. The youngest generation of apatite (Ap3) yields a U-Pb age of 260 ± 8 Ma and may have resulted from thermal resetting associated with the regional emplacement of Permian A-type granites. The proposed tectonic model assumes that rapid uplift (and cooling) of the Tatra block initiated at ca. 345 Ma, contemporaneous with anatexis. Subsequent fluid migration, possibly facilitated by extension related to the opening of Paleo-Tethys, affected only the southern part of the Tatra block. © 2018 Elsevier B.V.},

note = {10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-85020240132,

title = {The evolution of Eastern Tornquist-Paleoasian Ocean and subsequent continental collisions: A case study from the Western Tatra Mountains, Central Western Carpathians (Poland)},

author = { A. Gawęda and J. Burda and J. Golonka and U. Klötzli and D. Chew and K. Szopa and M. Wiedenbeck},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020240132&doi=10.1016%2fj.gr.2017.04.021&partnerID=40&md5=b869e7d91fe488fbdee5e4171fc07843},

doi = {10.1016/j.gr.2017.04.021},

issn = {1342937X},

year  = {2017},

date = {2017-01-01},

journal = {Gondwana Research},

volume = {48},

pages = {134-152},

publisher = {Elsevier Inc.},

abstract = {The crystalline basement of the Tatra Mountains in the Central Western Carpathians, forms part of the European Variscides and contains fragments of Gondwanan provenance. Metabasite rocks of MORB affinity in the Tatra Mountains are represented by two suites of amphibolites present in two metamorphic units (the Ornak and Goryczkowa Units) intercalated with metapelitic rocks. They are interpreted as relics of ocean crust, with zircon δ18OVSMOW values of 4.97–6.96‰. Zircon REE patterns suggest oxidizing to strongly oxidizing conditions in the parent mantle-derived basaltic magma. LA-MC-ICP-MS U-Pb dating of magmatic zircon cores yields a crystallization age of c. 560 Ma, with inherited components at c. 600 Ma, corresponding to the Pannotia break-up event and to the formation of the Eastern Tornquist–Paleoasian Ocean. However, the zircon rims of both suites yield evidence for two different geological histories. Zircon rims from the Ornak amphibolites record two overgrowth phases. The older rims, dated at 387 ± 8 Ma are interpreted as the result of an early stage of Variscan uplift while the younger rims dated at 342 ± 9 Ma are attributed to late Variscan collisional processes. They are characterized by high δ18OVSMOW values of 7.34–9.54‰ and are associated with migmatization related to the closure of the Rheic Ocean. Zircon rims from the Goryczkowa amphibolites yield evidence of metamorphism at 512 ± 5 Ma, subsequent Caledonian metamorphism at 447 ± 14 Ma, followed by two stages of Variscan metamorphism at 372 ± 12 Ma and 339 ± 7 Ma, the latter marking the final closure of the Rheic Ocean during late-Variscan collision. The presented data are the first direct dating of ocean crust formation in the eastern prolongation of the Tornquist Ocean, which formed a probable link to the Paleoasian Ocean. © 2017 International Association for Gondwana Research},

note = {11},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84939631782,

title = {Episodic construction of the Tatra granitoid intrusion (Central Western Carpathians, Poland/Slovakia): consequences for the geodynamics of Variscan collision and Rheic Ocean closure},

author = { A. Gawęda and J. Burda and U. Klötzli and J. Golonka and K. Szopa},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84939631782&doi=10.1007%2fs00531-015-1239-2&partnerID=40&md5=b253de659bcf0b087bb9be0788427a8d},

doi = {10.1007/s00531-015-1239-2},

issn = {14373254},

year  = {2016},

date = {2016-01-01},

journal = {International Journal of Earth Sciences},

volume = {105},

number = {4},

pages = {1153-1174},

publisher = {Springer Verlag},

abstract = {The Tatra granitoid pluton (Central Western Carpathians; Poland/Slovakia) is an example of composite polygenetic intrusion, comprising many magmatic pulses varying compositionally from diorite to granite. The U–Pb LA-MC-ICP-MS zircon dating of successive magma batches indicates the presence of magmatic episodes at 370–368, 365, 360, 355 and 350–340 Ma, all together covering a time span of 30 Ma of magmatic activity. The partial resorption and recycling of former granitoid material (“petrological cannibalism”) was a result of the incremental growth of the pluton and temperature in the range of 750–850 °C. The long-lasting granitoid magmatism was connected to the prolonged subduction of oceanic crust and collision of the Proto-Carpathian Terrane with a volcanic arc and finally with Laurussia, closing the Rheic Ocean. The differences in granitoid composition are the results of different depths of crustal melting. More felsic magmas were generated in the outer zone of the volcanic arc, whilst more mafic magmas were formed in the inner part of the supra-subduction zone. The source rocks of the granitoid magmas covered the compositional range of metapelite–amphibolite and were from both lower and upper crust. The presence of the inherited zircon cores suggests that the collision and granitoid magmatism involved crust of Cadomian consolidation age (c. 530 and 518 Ma) forming the Proto-Carpathian Terrane, crust of Avalonian affinity (462; 426 Ma) and melted metasedimentary rocks of volcanic arc provenance. © 2015, The Author(s).},

note = {28},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84896694172,

title = {U-Pb zircon age of the youngest magmatic activity in the high tatra granites (Central Western Carpathians)},

author = { J. Burda and A. Gawęda and U. Klötzli},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896694172&doi=10.2478%2fs13386-013-0106-9&partnerID=40&md5=3e0ff5edb0baa7e0a5463fb39c8ca0db},

doi = {10.2478/s13386-013-0106-9},

issn = {17338387},

year  = {2013},

date = {2013-01-01},

journal = {Geochronometria},

volume = {40},

number = {2},

pages = {134-144},

publisher = {Springer Verlag},

abstract = {Detailed cathodoluminescence (CL) imaging of zircon crystals, coupled with Laser Abla-tion Multi-Collector Inductively Coupled Plasma Mass Spectrometry (LA-MC-ICP-MS) U-Pb zircon dating was used to develop new insights into the evolution of granitoids from the High Tatra Moun-tains. The zircon U-Pb results show two distinct age groups (350±5 Ma and 337±6 Ma) recorded from cores and rims domains, respectively. Obtained results point that the last magmatic activity in the Ta-tra granitoid intrusion occurred at ca. 330 Ma. The previously suggested age of 314 Ma reflects rather the hydrothermal activity and Pb-loss, coupled with post-magmatic shearing. © 2013 Silesian University of Technology, Gliwice, Poland.},

note = {27},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-84896083712,

title = {Geochronology and petrogenesis of granitoid rocks from the Goryczkowa Unit, Tatra Mountains (Central Western Carpathians)},

author = { J. Burda and A. Gawęda and U. Klötzli},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896083712&doi=10.2478%2fgeoca-2013-0029&partnerID=40&md5=f2adda680deed4b33e1f11be6416ab5d},

doi = {10.2478/geoca-2013-0029},

issn = {13350552},

year  = {2013},

date = {2013-01-01},

journal = {Geologica Carpathica},

volume = {64},

number = {6},

pages = {419-435},

publisher = {Slovak Academic Press Ltd},

abstract = {The geochemical characteristics as well as the LA-MC-ICP-MS U-Pb zircon age relationship between two granitoid suites found in the Goryczkowa crystalline core in the Western Tatra Mountains were studied. The petrological investigations indicate that both granitoid suites were emplaced at medium crustal level, in a VAG (volcanic arc granites) tectonic setting. However, these suites differ in source material melted and represent two different magmatic stages: suite 1 represents a high temperature, oxidized, pre-plate collision intrusion, emplaced at ca. 371 Ma while suite 2 is late orogenic/anatectic magma, which intruded at ca. 350 Ma. These data are consistent with a period of intensive magmatic activity in the Tatra Mountain crystalline basement. The emplacement of granitoids postdates the LP-HT regional metamorphism/ partial melting at ca. 387 Ma and at 433-410 Ma, imprinted in the inherited zircon cores.},

note = {18},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-80955151633,

title = {Magma hybridization in the Western Tatra Mts. granitoid intrusion (S-Poland, Western Carpathians)},

author = { J. Burda and A. Gawęda and U. Klötzli},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80955151633&doi=10.1007%2fs00710-011-0150-1&partnerID=40&md5=cd744a983c5c97c110cbd1805b8368c1},

doi = {10.1007/s00710-011-0150-1},

issn = {09300708},

year  = {2011},

date = {2011-01-01},

journal = {Mineralogy and Petrology},

volume = {103},

number = {1-4},

pages = {19-36},

abstract = {In the Variscan Western Tatra granites hybridization phenomena such as mixing and mingling can be observed at the contact of mafic precursors of dioritic composition and more felsic granitic host rocks. The textural evidence of hybridization include: plagioclase-K-feldspar-sphene ocelli, hornblende- and biotite-rimmed quartz ocelli, plagioclase with Ca-rich spike zonation, inversely zoned K-feldspar crystals, mafic clots, poikilitic plagioclase and quartz crystals, mixed apatite morphologies, zoned K-feldspar phenocrysts. The apparent pressure range of the magma hybridization event was calculated at 6.1 kbar to 4.6 kbar, while the temperature, calculated by independent methods, is in the range of 810°C-770°C. U-Pb age data of the hybrid rocks were obtained by in-situ LA-MC-ICP-MS analysis of zircon. The oscillatory zoned zircon crystals yield a concordia age of 368 ± 8 Ma (MSWD = 1.1), interpreted as the age of magma hybridization and timing of formation of the magmatic precursors. It is the oldest Variscan magmatic event in that part of the Tatra Mountains. © 2011 The Author(s).},

note = {33},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-80355132022,

title = {Pre-Variscan evolution of the Western Tatra Mountains: New insights from U-Pb zircon dating},

author = { J. Burda and U. Klötzli},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-80355132022&doi=10.1007%2fs00710-011-0176-4&partnerID=40&md5=4a2968c4de98aa98b829be3193546cef},

doi = {10.1007/s00710-011-0176-4},

issn = {09300708},

year  = {2011},

date = {2011-01-01},

journal = {Mineralogy and Petrology},

volume = {102},

number = {1-4},

pages = {99-115},

publisher = {Springer-Verlag Wien},

abstract = {In situ LA-MC-ICP-MS U-Pb zircon geochronology combined with cathodoluminescence imaging were carried out to determine protolith and metamorphic ages of orthogneisses from the Western Tatra Mountains (Central Western Carpathians). The metamorphic complex is subdivided into two units (the Lower Unit and the Upper Unit). Orthogneisses of the Lower Unit are mostly banded, fine- to medium-grained rocks while in the Upper Unit varieties with augen structures predominate. Orthogneisses show a dynamically recrystallised mineral assemblage of Qz + Pl + Bt ± Grt with accessory zircon and apatite. They are peraluminous (ASI = 1. 20-1. 27) and interpreted to belong to a high-K calc-alkaline suite of a VAG-type tectonic setting. LA-MC-ICP-MS U-Pb zircon data from samples from both units, from crystals with oscillatory zoning and Th/U > 0. 1, yield similar concordia ages of ca. 534 Ma. This is interpreted to reflect the magmatic crystallization age of igneous precursors. These oldest meta-magmatics so far dated in the Western Tatra Mountains could be linked to the fragmentation of the northern margin of Gondwana. In zircons from a gneiss from the Upper Unit, cores with well-developed oscillatory zoning are surrounded by weakly luminescent, low contrast rims (Th/U < 0. 1). These yield a concordia age of ca. 387 Ma corresponding to a subsequent, Eo-Variscan, high-grade metamorphic event, connected with the formation of crustal-scale nappe structures and collision-related magmatism. © 2011 The Author(s).},

note = {13},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-67349092444,

title = {Shear-influenced partial melting in the Western Tatra metamorphic complex: Geochemistry and geochronology},

author = { J. Burda and A. Gawęda},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-67349092444&doi=10.1016%2fj.lithos.2009.01.010&partnerID=40&md5=dd784cccf707711ec2c5cda7bd5a71de},

doi = {10.1016/j.lithos.2009.01.010},

issn = {00244937},

year  = {2009},

date = {2009-01-01},

journal = {Lithos},

volume = {110},

number = {1-4},

pages = {373-385},

abstract = {The geochemical and isotopic characteristics as well as the age relationship between the migmatites and leucogranites, present in the metamorphic basement of the Western Tatra Mts. (Tatric Superunit - Central Western Carpathians), were studied. The suggested process for their formation was the progressive melting of the same metapelitic source under differing P-T-aH2O conditions during shearing. The migmatitic leucosomes started to form by vapour-present partial melting. As the melting developed, with increasing temperature and stress, muscovite dehydration-melting under both vapour-present and vapour-absent conditions was continued, giving rise to the formation of leucogranite melt pockets of different size. Coupled feldspar-governed fractionation and restite removal influenced the chemical and mineralogical zonation in leucogranite bodies, accumulated in the pressure shadows. No fractionation was observed in migmatitic leucosomes. U-Pb TIMS and LA-MC-ICP-MS zircon and monazite ages obtained from anatectic leucosome and leucogranite indicate that the partial melts crystallized at ca. 360-365 Ma. The zircon U-Pb ages reflect the span of time encompassing partial melting, melt separation and crystallization. The effect of the incipient crystallization of the partial melt is recorded by the inner part of the isometric zircons (Th/U < 0.1) which yielded an age of 365.1 ± 2.4 Ma (2σ). Their growth continued until the metamorphic climax at ca. 750 °C and 8 kbar. Elongate zircons (Th/U > 0.1) yielding an age of 360.5 ± 1.9 Ma (2σ) crystallized during initial cooling accompanied by melt crystallization. The two zircon populations bracket the time interval during which the analyzed monazite-(Ce) crystallized (ca. 365-360 Ma). The U-Pb age of the leucogranite zircons (359.1 ± 1.2 Ma) supports the thesis that the leucogranites crystallized from melt expelled from the migmatised metapelites. © 2009 Elsevier B.V. All rights reserved.},

note = {34},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-13844266075,

title = {The petrogenesis of quartz-diorites from the Tatra Mountains (Central Western Carpathians): An example of magma hybridisation},

author = { A. Gawęda and T. Doniecki and J. Burda and M. Kohut},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-13844266075&doi=10.1127%2f0077-7757%2f2005%2f0181-0005&partnerID=40&md5=4f5e9016f3ec8dcc64c2f37cb4ea6f03},

doi = {10.1127/0077-7757/2005/0181-0005},

issn = {00777757},

year  = {2005},

date = {2005-01-01},

journal = {Neues Jahrbuch fur Mineralogie, Abhandlungen},

volume = {181},

number = {1},

pages = {95-109},

abstract = {Quartz diorites, one of four granitoid varieties distinguished in the Tatra Mts., were found as enclaves in the composite Tatra granite pluton and as small intrusions in the metamorphic envelope. The rocks display contrasting mineralogical and petrological features, suggesting the involvement of crustal and mantle magma sources in their genesis. The presence of monazite and xenotime, the prevalence of zircons with low IT indexes, and intermediate Nd/Th ratios all suggest a parental magma of crustal character. On the other hand, the presence of allanite, metaluminous - subaluminous chemistry, and low Rb/Sr ratios (0.064-0.108) suggest a mantle influence. The isotopic (Nd and Sr) data are also typical of mantle-related magmas. The quartz diorites probably crystallised from hybrid magmas, with mingling of felsic (crustal) and mafic (mantle) magmas as a major process. The stabilisation of the mineral composition of the hybrid magma took place over a wide temperature interval from above 800 °C to below 600 °C. Though intrusion probably took place during decompression, pressure data from Al-in-hornblende geobarometry relate only to late magmatic overprinting (at about 4 kbars). The quartz diorites represent pre-plate collision magmas and could be mafic precursors of the felsic Tatra granitoids. © 2005 E. Schweizerbart'sche Verlagsbuchhandlung.},

note = {17},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2-s2.0-17344363972,

title = {Morphological and geochemical characteristics of zircon crystals from Smreczyński Wierch migmatite (Western Tatra Mts.) [Charakterystyka morfologiczna i geochemiczna kryształów cyrkonu z migmatytu ze Smreczyńskiego Wierchu (Tatry Zachodnie)]},

author = { J. Burda},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-17344363972&partnerID=40&md5=c29ff8c94c792c44bc1043e1beb6adaf},

issn = {00332151},

year  = {2005},

date = {2005-01-01},

journal = {Przeglad Geologiczny},

volume = {53},

number = {2},

pages = {127-133},

abstract = {In the Polish part of the metamorphic envelope of the granitoid Rohače pluton, migmatites are the predominant component. Migmatisation took place in the amphibolite facies conditions (T = 690-780°C; P = 7.5-11 kbar). To observe the response of zircon crystals to the melt formation, zircon from the anatectic group of migmatites was investigated (both from leucosome and mesosome of stromatitic migmatite). Different generations of zircon present in leuco- and mesosome reflect different geological processes acting during the rock formation. Zircon from leucosome represent mainly the euhedral varieties, with two typological maxima: S1-2 (I generation) and S21-22 (II generation). Zircon from mesosome represents the anhedral varieties with one maximum at S1 (I generation). In CL images the first generation (S1-2) comprises an inherited core surrounded by younger metamorphic and magmatic rims. The microchemical analyses showed that the inherited cores have higher Zr/Hf ratios than the overgrowing rims. The second generation (S21-22) revealed only oscillatory zonation. The zones with strong luminescence are characterized by a decrease of Hf and U content. Zircon showing polyphase internal structure might represent a component of mesosome which survived the dissolution in granitic melt, while zircon with oscillatory zonation might have crystallized from anatectic melt.},

note = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}