Migmatization and large-scale folding in the Orlica–Śnieżnik Dome, NE Bohemian Massif: Pressure–temperature–time–deformation constraints on Variscan terrane assembly

Jastrzębski, Mirosław; Stawikowski, Wojciech; Budzyń, Bartosz; Orłowski, Ryszard

doi:10.1016/j.tecto.2014.05.011

Cited by 11 publications

(25 citation statements)

References 78 publications

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“…13). This age spectrum cor re sponds with the pre vi ously ob tained monazite age spec tra de rived from metasedimentary rocksfrom the Orlica-OEnie¿nik Dome (Jastrzêbski et al, 2014(Jastrzêbski et al, , 2016 and from the Staré Mìsto Belt (Gordon et al, 2005;Jastrzêbski et al, 2013). In ter est ingly, the monazite in clu sions in the an da lu site blasts pro vide an age re cord of ca.…”

Section: Th-u-total Pb Geochronologysupporting

confidence: 58%

Monazite stability and the maintenance of Th-U-total Pb ages during post-magmatic processes in granitoids and host metasedimentary rocks: A case study from the Sudetes (SW Poland)

Budzyń

Jastrzębski

2015

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1 Pol ish Acad emy of Sci ences, In sti tute of Geo log i cal Sci ences, Senacka 1, 31-002 Kraków, Po land 2 Pol ish Acad emy of Sci ences, In sti tute of Geo log i cal Sci ences, Podwale 75, 50-449 Wroc³aw, Po land Budzyñ, B., Jastrzêbski, M., 2016. Monazite sta bil ity and the main te nance of Th-U-to tal Pb ages dur ing post-mag matic processes in granitoids and host metasedimentary rocks: a case study from the Sudetes (SW Po land). Geo log i cal Quar terly, 60 (1): 106-123, doi: 10.7306/gq.1254The sta bil ity and main te nance of the age re cord of monazite dur ing post-mag matic pro cesses were stud ied in gra nitic and host metasedimentary rocks from the Sudetes (SW Po land). Un al tered monazite in the K³odzko-Z³oty Stok granitoid provided a Th-U-to tal Pb age of 329 ± 5 Ma, which con strains tim ing of the late stage of pluton em place ment. In con trast, monazite in the Jawornik granitoid re mained un al tered or was par tially re placed by sec ond ary phases, in clud ing (1) al la nite, epidote and, oc ca sion ally, ap a tite; (2) cheralite, al la nite and a mix ture of clays, Fe ox ides and pos si ble un known rare earth el e ment (REE) phases; and (3) K-feld spar and cheralite with sub se quent for ma tion of ti tan ite. Dif fer ent al ter ation prod ucts on the thin sec tion scale in di cate the lo cal char ac ter of the post-mag matic pro cesses af fect ing monazite in duced by alkali-rich flu ids. The al tered and un al tered monazite grains both yielded a Th-U-to tal Pb age of 343 ± 4 Ma. The Th-U-to tal Pb ages of the monazite in the ac com pa ny ing metasedimentary rocks ther mally af fected by in trud ing mag mas were also constrained. In the paragneiss in con tact with the Jawornik granitoid, the un al tered monazite and monazite par tially re placed by al la nite yielded an age of 344 ± 5 Ma. The monazite from the mica schist, far ther from the con tact with the granitoids, ex hibited an age of 336 ± 4.5 Ma. The 344-336 Ma ages dem on strated a re cord of monazite (re)growth dur ing pro longed Variscan meta mor phism. The pre dom i nant early Visean ages con strain the tim ing of the de vel op ment of the Z³oty Stok-Skrzynka Shear Zone and the em place ment of the Jawornik granitoid in tru sion. The age re sults, which are con sis tent with pre vi ous geo chron ol ogy, in di cate that the par tial al ter ation of the monazite did not af fect the in ter nal do mains or the main te nance of the monazite ages. Thus, this study re veals that monazite geo chron ol ogy can pro vide mean ing ful data in crys tal line rocks affected by fluid-in duced post-mag matic pro cesses.

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Section: Th-u-total Pb Geochronologysupporting

confidence: 58%

Monazite stability and the maintenance of Th-U-total Pb ages during post-magmatic processes in granitoids and host metasedimentary rocks: A case study from the Sudetes (SW Poland)

Budzyń

Jastrzębski

2015

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“…342 Ma; Turniak et al., ) that was preceded by a high‐grade event of older ( c . 380–360 Ma; Anczkiewicz et al., ; Gordon, Schneider, Manecki, & Holm, ; Jastrzębski, Stawikowski, Budzyń, & Orłowski, ; Klemd & Bröcker, ) or similar age ( c . 340 Ma; Bröcker, Klemd, Kooijman, Berndt, & Larionov, ; Bröcker et al., ; Štípská, Schulmann, & Kröner, ).…”

Section: Geological Settingmentioning

confidence: 99%

Integrating X‐ray mapping and microtomography of garnet with thermobarometry to define the P–T evolution of the (near) UHP Międzygórze eclogite, Sudetes, SW Poland

Majka

Mazur

Młynarska

et al. 2018

Journal Metamorphic Geology

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Detailed X‐ray compositional mapping and microtomography have revealed the complex zoning and growth history of garnet in a kyanite‐bearing eclogite. The garnet occurs as clusters of coalesced grains with cores revealing slightly higher Ca and lower Mg than the rims forming the coalescence zones between the grains. Core regions of the garnet host inclusions of omphacite with the highest jadeite, and phengite with the highest Si, similar to values in the cores of omphacite and phengite located in the matrix. Therefore, the core compositions of garnet, omphacite, and phengite have been chosen for the peak pressure estimate. Coupled conventional thermobarometry, average P–T, and phase equilibrium modelling in the NCKFMMnASHT system yields P–T conditions of 26–30 kbar at 800–930°C. Although coesite is not preserved, these P–T conditions partially overlap the coesite stability field, suggesting near ultra‐high–pressure (UHP) conditions during the formation of this eclogite. Therefore, the peak pressure assemblage is suggested to have been garnet–omphacite–kyanite–phengite–coesite/quartz–rutile. Additional lines of evidence for the possible UHP origin of the Międzygórze eclogite are the presence of rod‐shaped inclusions of quartz parallel to the c‐axis in omphacite as well as relatively high values of Ca‐Tschermak and Ca‐Eskola components. Late zoisite, rare diopside–plagioclase symplectites rimming omphacite, and minor phlogopite–plagioclase symplectites replacing phengite formed during retrogression together with later amphibole. These retrograde assemblages lack minerals typical of granulite facies, which suggests simultaneous decompression and cooling during exhumation before the crustal‐scale folding that was responsible for final exhumation of the eclogite.

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“…The courses of the faults and probable faults are from Don et al (2003), Gawlikowska and Opletal (1997), and Štípská et al (2006). Jastrzębski et al, 2014). The Stronie Formation consists of metapelites accompanied at the base by light and dark quartzites, in the middle by marbles and scarce calc-silicate rocks and, in the upper portions of the lithostratigraphic column by bimodal mafic and felsic metavolcanogenic rocks (e.g., Don et al, 2003;Smulikowski, 1979;Wojciechowska, 1993;review in Żelaźniewicz et al, 2014a).…”

Section: Rock Units and Lithostratigraphymentioning

confidence: 99%

“…and the Stronie Fm. On the other hand, numerous detailed petrographic and field works indicated that the observed rock succession of the Młynowiec-Stronie Group presumably reflects environmental changes in a single transient sedimentary basin (e.g., Cwojdziński, 1977;Jastrzębski et al, 2014;Oberc, 1968b;Smulikowski, 1979;Wojciechowska, 1993). Our new U-Pb zircon ages are consistent with the earlier zircon SHRIMP data for the Stronie Fm.…”

Section: Osd and Smb As Parts Of Saxothuringiamentioning

confidence: 99%

The Moldanubian Thrust Zone — A terrane boundary in the Central European Variscides refined based on lithostratigraphy and U–Pb zircon geochronology

Jastrzębski

Żelaźniewicz

Murtezi

et al. 2015

Lithos

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Migmatization and large-scale folding in the Orlica–Śnieżnik Dome, NE Bohemian Massif: Pressure–temperature–time–deformation constraints on Variscan terrane assembly

Cited by 11 publications

References 78 publications

Monazite stability and the maintenance of Th-U-total Pb ages during post-magmatic processes in granitoids and host metasedimentary rocks: A case study from the Sudetes (SW Poland)

Monazite stability and the maintenance of Th-U-total Pb ages during post-magmatic processes in granitoids and host metasedimentary rocks: A case study from the Sudetes (SW Poland)

Integrating X‐ray mapping and microtomography of garnet with thermobarometry to define the P–T evolution of the (near) UHP Międzygórze eclogite, Sudetes, SW Poland

The Moldanubian Thrust Zone — A terrane boundary in the Central European Variscides refined based on lithostratigraphy and U–Pb zircon geochronology

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