Chronology of the Saxothuringian subduction in the West Sudetes (Bohemian Massif, Czech Republic and Poland)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10394404" target="_blank" >RIV/00216208:11310/19:10394404 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025798:_____/19:00000077

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=WDliy.arpq" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=WDliy.arpq</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1144/jgs2018-173" target="_blank" >10.1144/jgs2018-173</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Chronology of the Saxothuringian subduction in the West Sudetes (Bohemian Massif, Czech Republic and Poland)

Popis výsledku v původním jazyce

Isotopic dating of monazite and garnet from high-pressure metamorphic rocks exposed in the northern part of the Saxothuringian palaeo-suture in the Bohemian Massif revealed a diachronous metamorphism of various rock types that are now closely associated within allochthonous units representing the Devonian-Carboniferous subduction-accretionary complex. Mafic blueschists of the middle unit yielded a Lu-Hf garnet age of 363.9 +/- 1.3 Ma. The blueschists occur within high-pressure, garnet-free phyllites. Monazite extracted from this rock type yielded a U-Pb isotope dilution thermal ionization mass spectrometry age of 336.5 +/- 0.5 Ma. Garnet-bearing micaschist of the lower unit contains monazite with a U-Pb secondary ion mass spectrometry age of 341 +/- 3 Ma, consistent with Lu-Hf garnet-whole-rock ages of 344.5 +/- 1.3 and 342 +/- 7 Ma obtained from the same rock type. Existing tectonic models of the Bohemian Massif, and particularly of its northern part, assume that the period of oceanic subduction was terminated at c. 380-375 Ma by the arrival of an attenuated Saxothuringian continental crust, which was partly subducted and partly relaminated underneath the overriding Tepla-Barrandian Domain. However, our data, as well as data from mafic high-pressure rocks in the southern part of the Saxothuringian Domain, suggest that the initial collision was probably caused by the arrival of a smaller crustal block present within the Saxothuringian oceanic domain. After its subduction and relamination, the oceanic subduction was re-established and terminated by continental subduction and later collision of the Saxothuringian passive margin at c. 345-335 Ma.

Název v anglickém jazyce

Chronology of the Saxothuringian subduction in the West Sudetes (Bohemian Massif, Czech Republic and Poland)

Popis výsledku anglicky

Isotopic dating of monazite and garnet from high-pressure metamorphic rocks exposed in the northern part of the Saxothuringian palaeo-suture in the Bohemian Massif revealed a diachronous metamorphism of various rock types that are now closely associated within allochthonous units representing the Devonian-Carboniferous subduction-accretionary complex. Mafic blueschists of the middle unit yielded a Lu-Hf garnet age of 363.9 +/- 1.3 Ma. The blueschists occur within high-pressure, garnet-free phyllites. Monazite extracted from this rock type yielded a U-Pb isotope dilution thermal ionization mass spectrometry age of 336.5 +/- 0.5 Ma. Garnet-bearing micaschist of the lower unit contains monazite with a U-Pb secondary ion mass spectrometry age of 341 +/- 3 Ma, consistent with Lu-Hf garnet-whole-rock ages of 344.5 +/- 1.3 and 342 +/- 7 Ma obtained from the same rock type. Existing tectonic models of the Bohemian Massif, and particularly of its northern part, assume that the period of oceanic subduction was terminated at c. 380-375 Ma by the arrival of an attenuated Saxothuringian continental crust, which was partly subducted and partly relaminated underneath the overriding Tepla-Barrandian Domain. However, our data, as well as data from mafic high-pressure rocks in the southern part of the Saxothuringian Domain, suggest that the initial collision was probably caused by the arrival of a smaller crustal block present within the Saxothuringian oceanic domain. After its subduction and relamination, the oceanic subduction was re-established and terminated by continental subduction and later collision of the Saxothuringian passive margin at c. 345-335 Ma.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA17-22207S" target="_blank" >GA17-22207S: Role zděděné architektury kontinentálního okraje na ranně Variskou konvergenci</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of the Geological Society

ISSN

0016-7649

e-ISSN

—

Svazek periodika

176

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

492-504

Kód UT WoS článku

000467147200007

EID výsledku v databázi Scopus

2-s2.0-85065120384