Metamorphic inheritance of Rheic passive margin evolution and its early Variscan overprint in the Teplá-Barrandian Unit, Bohemian Massif

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F17%3A00000026" target="_blank" >RIV/00025798:_____/17:00000026 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/17:10359016

Výsledek na webu

<a href="http://onlinelibrary.wiley.com/doi/10.1111/jmg.12234/abstract" target="_blank" >http://onlinelibrary.wiley.com/doi/10.1111/jmg.12234/abstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/jmg.12234" target="_blank" >10.1111/jmg.12234</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Metamorphic inheritance of Rheic passive margin evolution and its early Variscan overprint in the Teplá-Barrandian Unit, Bohemian Massif

Popis výsledku v původním jazyce

Rift-related regional metamorphism of passive margins is usually difficult to observe on the surface, mainly due to its strong metamorphic overprint during the subsequent orogenic processes that cause its exposure. metamorphic petrology, P–T modelling, structural geology and in-situ U-Pb monazite geochronology using laser-ablation split-stream inductively coupled plasma mass spectrometry, was applied to unravel the polyphase tectono-metamorphic record of metapelites at the western margin of the Teplá-Barrandian domain. The oldest event M1 is LP–HT regional metamorphism with a geothermal gradient between 30 and 50°C km-1, peak temperatures up to 650°C and of Cambro-Ordovician age (c. 485 Ma). The M1 event was followed by M2-D2, which is characterized by a Barrovian sequence of minerals from biotite to kyanite and a geothermal gradient of 20–25°C km-1. D2-M2 is associated with a vertical fabric S2, and was dated as Devonian (c. 375 Ma). Finally, the vertical fabric S2 was overprinted by a D3-M3 event that formed sillimanite- to chlorite- bearing gently inclined fabric S3 also of Devonian age. The high geothermal gradient of the M1 event is due to an extensional, rift-related tectonic setting. The subsequent Devonian evolution is interpreted as horizontal shortening of the passive margin at the beginning of Variscan convergence, followed by detachment-accommodated exhumation of lower-crustal rocks. Both Devonian shortening and detachment occurred in the upper plate of a Devonian subduction zone. The tectonic evolution presented in this paper modifies previous models of the tectonic history of the western margin of the Teplá-Barrandian domain, and also put constraints on the evolution of the southern margin of the Rheic ocean from the passive margin formation to the early phases of Variscan orogeny.

Název v anglickém jazyce

Metamorphic inheritance of Rheic passive margin evolution and its early Variscan overprint in the Teplá-Barrandian Unit, Bohemian Massif

Popis výsledku anglicky

Rift-related regional metamorphism of passive margins is usually difficult to observe on the surface, mainly due to its strong metamorphic overprint during the subsequent orogenic processes that cause its exposure. metamorphic petrology, P–T modelling, structural geology and in-situ U-Pb monazite geochronology using laser-ablation split-stream inductively coupled plasma mass spectrometry, was applied to unravel the polyphase tectono-metamorphic record of metapelites at the western margin of the Teplá-Barrandian domain. The oldest event M1 is LP–HT regional metamorphism with a geothermal gradient between 30 and 50°C km-1, peak temperatures up to 650°C and of Cambro-Ordovician age (c. 485 Ma). The M1 event was followed by M2-D2, which is characterized by a Barrovian sequence of minerals from biotite to kyanite and a geothermal gradient of 20–25°C km-1. D2-M2 is associated with a vertical fabric S2, and was dated as Devonian (c. 375 Ma). Finally, the vertical fabric S2 was overprinted by a D3-M3 event that formed sillimanite- to chlorite- bearing gently inclined fabric S3 also of Devonian age. The high geothermal gradient of the M1 event is due to an extensional, rift-related tectonic setting. The subsequent Devonian evolution is interpreted as horizontal shortening of the passive margin at the beginning of Variscan convergence, followed by detachment-accommodated exhumation of lower-crustal rocks. Both Devonian shortening and detachment occurred in the upper plate of a Devonian subduction zone. The tectonic evolution presented in this paper modifies previous models of the tectonic history of the western margin of the Teplá-Barrandian domain, and also put constraints on the evolution of the southern margin of the Rheic ocean from the passive margin formation to the early phases of Variscan orogeny.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Metamorphic Geology

ISSN

0263-4929

e-ISSN

—

Svazek periodika

35

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

28

Strana od-do

327-355

Kód UT WoS článku

000396743100004

EID výsledku v databázi Scopus

2-s2.0-85008252509