Early Palaeozoic sedimentary record and provenance of flysch sequencesin the Hovd Zone (western Mongolia): Implications for the geodynamic evolution of the Altai accretionary wedge system

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F18%3A00000163" target="_blank" >RIV/00025798:_____/18:00000163 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/18:10378984

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1342937X18302223?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1342937X18302223?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2018.07.005" target="_blank" >10.1016/j.gr.2018.07.005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Early Palaeozoic sedimentary record and provenance of flysch sequencesin the Hovd Zone (western Mongolia): Implications for the geodynamic evolution of the Altai accretionary wedge system

Popis výsledku v původním jazyce

Sedimentological and detrital zircon provenance study of the Lower Palaeozoic Zuunnuruu, Tsetseg and Sagsaisedimentary formations was carried out in the eastern part of the Hovd Zone in western Mongolia. Sedimentologicalanalysis has revealed two distinct and consecutive types of sedimentary environments. The LowerOrdovician–earliest Silurian sediments had dominantly volcano-sedimentary character, interpreted as reflectingdeposition in a proximal part of a Pacific-type accretionarywedge. The upper,mainly Devonian part of the profilehas generally siliciclastic flysch-like nature and indicates platform-type depositional setting related to the synextensionalthinning of the accretionary wedge-system. Detrital zircon age populations of all the three studiedformations uniformly show a dominant Neoproterozoic–Ordovician age group at ca. 560–460 Ma, a broadNeo- to Mesoproterozoic peak at ca. 1050–720 Ma, several minor Meso- to Palaeoproterozoic age clusters atca. 1.4, 1.9 and 2.4 Ga and ca. 400–360 Ma peaks in the youngest Devonian formation. The early Palaeozoicpart of the age spectra is interpreted as detritus mainly derived from the magmatic rocks of the Cambrian–Ordovician Ikh-Mongol Arc System within the nearby Lake Zone and the youngest ages from the neighbouringDevonian granites. The other sources were identified as more distal Tonian magmatic-arc complexes, Rodiniabreak-up-related volcanic rocks and basement of the Precambrian Zavkhan and Baidrag continental blockseven further east. The maximum sedimentary ages, determined by the youngest detrital zircons, shift the endof deposition of the Sagsai Formation at least to the latest Devonian. Nearly identical detrital zircon age spectrafromLower Palaeozoic sequences of the Hovd Zone and other parts of the Altai belt support an existence of a singlegiant accretionary complex developed along the entire outer margin of the Ikh-Mongol Arc System. Thechange in the sedimentary style suggests the latest Ordovician–earliest Silurian termination ofmagmatic-arc activityin the western Lake Zone, marking the onset of late Silurian–Devonian crustal extensional period in theAltai accretionary system.

Název v anglickém jazyce

Early Palaeozoic sedimentary record and provenance of flysch sequencesin the Hovd Zone (western Mongolia): Implications for the geodynamic evolution of the Altai accretionary wedge system

Popis výsledku anglicky

Sedimentological and detrital zircon provenance study of the Lower Palaeozoic Zuunnuruu, Tsetseg and Sagsaisedimentary formations was carried out in the eastern part of the Hovd Zone in western Mongolia. Sedimentologicalanalysis has revealed two distinct and consecutive types of sedimentary environments. The LowerOrdovician–earliest Silurian sediments had dominantly volcano-sedimentary character, interpreted as reflectingdeposition in a proximal part of a Pacific-type accretionarywedge. The upper,mainly Devonian part of the profilehas generally siliciclastic flysch-like nature and indicates platform-type depositional setting related to the synextensionalthinning of the accretionary wedge-system. Detrital zircon age populations of all the three studiedformations uniformly show a dominant Neoproterozoic–Ordovician age group at ca. 560–460 Ma, a broadNeo- to Mesoproterozoic peak at ca. 1050–720 Ma, several minor Meso- to Palaeoproterozoic age clusters atca. 1.4, 1.9 and 2.4 Ga and ca. 400–360 Ma peaks in the youngest Devonian formation. The early Palaeozoicpart of the age spectra is interpreted as detritus mainly derived from the magmatic rocks of the Cambrian–Ordovician Ikh-Mongol Arc System within the nearby Lake Zone and the youngest ages from the neighbouringDevonian granites. The other sources were identified as more distal Tonian magmatic-arc complexes, Rodiniabreak-up-related volcanic rocks and basement of the Precambrian Zavkhan and Baidrag continental blockseven further east. The maximum sedimentary ages, determined by the youngest detrital zircons, shift the endof deposition of the Sagsai Formation at least to the latest Devonian. Nearly identical detrital zircon age spectrafromLower Palaeozoic sequences of the Hovd Zone and other parts of the Altai belt support an existence of a singlegiant accretionary complex developed along the entire outer margin of the Ikh-Mongol Arc System. Thechange in the sedimentary style suggests the latest Ordovician–earliest Silurian termination ofmagmatic-arc activityin the western Lake Zone, marking the onset of late Silurian–Devonian crustal extensional period in theAltai accretionary system.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA17-17540S" target="_blank" >GA17-17540S: Kontrastní mechanizmy růstu superkontinentu Pangea: nový pohled na tvorbu kontinentální kůry</a><br>

Návaznosti

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

Rok uplatnění

2018

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

—

Svazek periodika

64

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

21

Strana od-do

163-183

Kód UT WoS článku

000454669700010

EID výsledku v databázi Scopus

2-s2.0-85053808960