From Rodinian passive margin to peri-Siberian continental arc: Evidence from the multiphase Neoproterozoic–early Paleozoic magmatic record of the Zavkhan Block in the Mongolian Collage

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F23%3A00572541" target="_blank" >RIV/67985831:_____/23:00572541 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00025798:_____/23:10168794 RIV/00216208:11310/23:10477299

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1342937X23001314?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1342937X23001314?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2023.05.001" target="_blank" >10.1016/j.gr.2023.05.001</a>

Jazyk výsledku

angličtina

Název v původním jazyce

From Rodinian passive margin to peri-Siberian continental arc: Evidence from the multiphase Neoproterozoic–early Paleozoic magmatic record of the Zavkhan Block in the Mongolian Collage

Popis výsledku v původním jazyce

Geochronological and geochemical study of the Neoproterozoic–early Paleozoic magmatic record was carried out in two sections of the Zavkhan Block, one of the largest continental fragments within the Mongolian Collage of the Central Asian Orogenic Belt. Our results show that two distinct magmatic events occurred in both studied domains, the Late Tonian (c. 840–800 Ma) and the Cambro–Ordovician (c. 510– 470 Ma). Based on the variable geochemical signatures and two-stage Nd model ages (TDM Nd:2stg=1.4–3.0 Ga), the late Tonian magmatism included both mantle-derived magmas that suffered a crustal contamination as well as partial melts of a heterogeneous continental crust that ranged from Paleo- to Mesoproterozoic (felsic metaigneous rocks or immature metagreywackes) to Neoarchean–Paleoproterozoic (metabasalts or metatonalites). The Cambro–Ordovician basic–acidic magmatism (TDM Nd:2stg=1.3–2.2 Ga) reflected interplay between two components, mafic juvenile (depleted-mantle-derived) and felsic, generated by anatexis of Tonian, mainly metabasic crust. The late Tonian (c. 840–800 Ma) magmatic activity is interpreted as result of intracontinental rifting, whereas the Cambro–Ordovician (c. 510–470 Ma) magmatism is linked to a continental magmatic-arc system. The comparison of the data from the Zavkhan Block with other microcontinents of the Mongolian Collage shows that most of them experienced an identical two-stage magmatic evolution. The first stage is interpreted as a result of the Rodinia break-up, whereas the second one was associated with inception of the Paleo-Pacific Plate subduction. Based on similarities in the magmatic record, we conclude that the Mongolian Collage microcontinents were located at the Rodinia periphery, as a part of either the Siberian or Tarim cratons. They were separated in the late Tonian, established a passive margin and drifted towards southern Siberia, where they recorded arc magmatism related to the Cambro–Ordovician subduction of the Paleo-Pacific Plate.

Název v anglickém jazyce

From Rodinian passive margin to peri-Siberian continental arc: Evidence from the multiphase Neoproterozoic–early Paleozoic magmatic record of the Zavkhan Block in the Mongolian Collage

Popis výsledku anglicky

Geochronological and geochemical study of the Neoproterozoic–early Paleozoic magmatic record was carried out in two sections of the Zavkhan Block, one of the largest continental fragments within the Mongolian Collage of the Central Asian Orogenic Belt. Our results show that two distinct magmatic events occurred in both studied domains, the Late Tonian (c. 840–800 Ma) and the Cambro–Ordovician (c. 510– 470 Ma). Based on the variable geochemical signatures and two-stage Nd model ages (TDM Nd:2stg=1.4–3.0 Ga), the late Tonian magmatism included both mantle-derived magmas that suffered a crustal contamination as well as partial melts of a heterogeneous continental crust that ranged from Paleo- to Mesoproterozoic (felsic metaigneous rocks or immature metagreywackes) to Neoarchean–Paleoproterozoic (metabasalts or metatonalites). The Cambro–Ordovician basic–acidic magmatism (TDM Nd:2stg=1.3–2.2 Ga) reflected interplay between two components, mafic juvenile (depleted-mantle-derived) and felsic, generated by anatexis of Tonian, mainly metabasic crust. The late Tonian (c. 840–800 Ma) magmatic activity is interpreted as result of intracontinental rifting, whereas the Cambro–Ordovician (c. 510–470 Ma) magmatism is linked to a continental magmatic-arc system. The comparison of the data from the Zavkhan Block with other microcontinents of the Mongolian Collage shows that most of them experienced an identical two-stage magmatic evolution. The first stage is interpreted as a result of the Rodinia break-up, whereas the second one was associated with inception of the Paleo-Pacific Plate subduction. Based on similarities in the magmatic record, we conclude that the Mongolian Collage microcontinents were located at the Rodinia periphery, as a part of either the Siberian or Tarim cratons. They were separated in the late Tonian, established a passive margin and drifted towards southern Siberia, where they recorded arc magmatism related to the Cambro–Ordovician subduction of the Paleo-Pacific Plate.

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

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

121

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

24

Strana od-do

344-367

Kód UT WoS článku

001014806800001

EID výsledku v databázi Scopus

2-s2.0-85160570932