Supra-subduction thickening of a continental back-arc: Ediacaran-early Cambrian (Baikalian) metamorphism in the NE Baidrag block (Mongolian Collage)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F24%3A10169067" target="_blank" >RIV/00025798:_____/24:10169067 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/24:10496211

Výsledek na webu

<a href="https://doi.org/10.1016/j.gr.2024.08.007" target="_blank" >https://doi.org/10.1016/j.gr.2024.08.007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2024.08.007" target="_blank" >10.1016/j.gr.2024.08.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Supra-subduction thickening of a continental back-arc: Ediacaran-early Cambrian (Baikalian) metamorphism in the NE Baidrag block (Mongolian Collage)

Popis výsledku v původním jazyce

In-situ monazite geochronology with P-T modelling of Barrovian-type metasediments was carried in the Burd Gol zone, NE Baidrag block. The P-T peak recorded by Grt-Sil migmatite is similar to 780 degrees C, 7.5 kbar; by Grt-St-Ky gneiss similar to 690 degrees C, 10 kbar and by Grt schist similar to 590 degrees C, 8 kbar. Monazite ages related to metamorphic peaks indicate diachronous burial events, c. 570-565 Ma for the Grt-Sil migmatite, c. 565-560 Ma for the Grt-St-Ky gneiss, and at c. 538 Ma for the Grt schist. Tonian Grt-St schist recorded new monazite crystallization at c. 546-543 Ma. By c. 545-542 Ma, the Grt-Sil migmatite and Grt-St-Ky gneiss experienced exhumation to similar to 5 kbar, while the Grt schist underwent burial. Further exhumation is dated by xenotime, rutile and monazite alteration down to c. 515 Ma. The data suggest a prolonged orogenic cycle initiated by burial of distal orogenic core to the depths of similar to 35 km at c. 570-565 Ma while the proximal continental margin was buried at c. 545-538 Ma. The higher-grade core was subsequently exhumed to the middle crust at c. 550-540 Ma and the orogenic activity ceased at c. 515 Ma. The difference in metamorphic gradients around 570-560 Ma, with similar to 27-28 degrees C/km for the Grt-Sil migmatite and similar to 18-19 degrees C/km for the Grt-St-Ky gneiss suggests lateral variations as a result of localized juxtaposition of migmatite-magmatite lower-middle crust with colder regions. A new model shows the Burd Gol zone as a progressively thickened and exhumed continental back-arc system beneath the supracrustal 590-570 Ma continental back-arc represented by the adjacent Ulziit Gol unit. The data provide important constraint on the timing and mechanisms of orogenic Baikal cycle at the margin of the Siberian Craton.

Název v anglickém jazyce

Supra-subduction thickening of a continental back-arc: Ediacaran-early Cambrian (Baikalian) metamorphism in the NE Baidrag block (Mongolian Collage)

Popis výsledku anglicky

In-situ monazite geochronology with P-T modelling of Barrovian-type metasediments was carried in the Burd Gol zone, NE Baidrag block. The P-T peak recorded by Grt-Sil migmatite is similar to 780 degrees C, 7.5 kbar; by Grt-St-Ky gneiss similar to 690 degrees C, 10 kbar and by Grt schist similar to 590 degrees C, 8 kbar. Monazite ages related to metamorphic peaks indicate diachronous burial events, c. 570-565 Ma for the Grt-Sil migmatite, c. 565-560 Ma for the Grt-St-Ky gneiss, and at c. 538 Ma for the Grt schist. Tonian Grt-St schist recorded new monazite crystallization at c. 546-543 Ma. By c. 545-542 Ma, the Grt-Sil migmatite and Grt-St-Ky gneiss experienced exhumation to similar to 5 kbar, while the Grt schist underwent burial. Further exhumation is dated by xenotime, rutile and monazite alteration down to c. 515 Ma. The data suggest a prolonged orogenic cycle initiated by burial of distal orogenic core to the depths of similar to 35 km at c. 570-565 Ma while the proximal continental margin was buried at c. 545-538 Ma. The higher-grade core was subsequently exhumed to the middle crust at c. 550-540 Ma and the orogenic activity ceased at c. 515 Ma. The difference in metamorphic gradients around 570-560 Ma, with similar to 27-28 degrees C/km for the Grt-Sil migmatite and similar to 18-19 degrees C/km for the Grt-St-Ky gneiss suggests lateral variations as a result of localized juxtaposition of migmatite-magmatite lower-middle crust with colder regions. A new model shows the Burd Gol zone as a progressively thickened and exhumed continental back-arc system beneath the supracrustal 590-570 Ma continental back-arc represented by the adjacent Ulziit Gol unit. The data provide important constraint on the timing and mechanisms of orogenic Baikal cycle at the margin of the Siberian Craton.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GX19-27682X" target="_blank" >GX19-27682X: Hlavní mechanismy periferálního kontinentálního růstu během superkontinentálního cyklu</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Gondwana research

ISSN

1342-937X

e-ISSN

1878-0571

Svazek periodika

135

Číslo periodika v rámci svazku

Listopad 2024

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

32

Strana od-do

234-265

Kód UT WoS článku

001306100500001

EID výsledku v databázi Scopus

2-s2.0-85202662187