Anatexis of accretionary wedge, Pacific type magmatism and formation of vertically stratified continental crust in the Altai Orogenic Belt

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F16%3A00000156" target="_blank" >RIV/00025798:_____/16:00000156 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/16:10358990

Výsledek na webu

<a href="http://onlinelibrary.wiley.com/doi/10.1002/2016TC004271/abstract" target="_blank" >http://onlinelibrary.wiley.com/doi/10.1002/2016TC004271/abstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2016TC004271" target="_blank" >10.1002/2016TC004271</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Anatexis of accretionary wedge, Pacific type magmatism and formation of vertically stratified continental crust in the Altai Orogenic Belt

Popis výsledku v původním jazyce

Granitoid magmatism and its role in differentiation and stabilization of the Paleozoic accretionary wedge in the Chinese Altai are evaluated in this study. Voluminous Silurian–Devonian granitoids intruded a greywacke-dominated Ordovician sedimentary succession (the Habahe Group) of the accretionary wedge. The close temporal and spatial relationship between the regional anatexis and the formation of granitoids, as well as their geochemical similarities including rather un-evolved Nd isotopic signatures and the strong enrichment of Large Ion Lithophile Elements (LILE) relative to many of the High Field Strength Elements (HFSE), may indicate that the granitoids are product of partial melting of the accretionary wedge rocks. Whole-rock geochemistry and pseudosection modeling show that regional anatexis of fertile sediments could have produced a large amount of melts compositionally similar to the granitoids. Such process could have left a high-density garnet- and/or garnet–pyroxene granulite residue in the deep crust, which can be the major reason for the gravity high over the Chinese Altai. Our results show that melting and crustal differentiation can transform accretionary wedge sediments into vertically stratified and stable continental crust. This may be a key mechanism contributing to the peripheral continental growth worldwide.

Název v anglickém jazyce

Anatexis of accretionary wedge, Pacific type magmatism and formation of vertically stratified continental crust in the Altai Orogenic Belt

Popis výsledku anglicky

Granitoid magmatism and its role in differentiation and stabilization of the Paleozoic accretionary wedge in the Chinese Altai are evaluated in this study. Voluminous Silurian–Devonian granitoids intruded a greywacke-dominated Ordovician sedimentary succession (the Habahe Group) of the accretionary wedge. The close temporal and spatial relationship between the regional anatexis and the formation of granitoids, as well as their geochemical similarities including rather un-evolved Nd isotopic signatures and the strong enrichment of Large Ion Lithophile Elements (LILE) relative to many of the High Field Strength Elements (HFSE), may indicate that the granitoids are product of partial melting of the accretionary wedge rocks. Whole-rock geochemistry and pseudosection modeling show that regional anatexis of fertile sediments could have produced a large amount of melts compositionally similar to the granitoids. Such process could have left a high-density garnet- and/or garnet–pyroxene granulite residue in the deep crust, which can be the major reason for the gravity high over the Chinese Altai. Our results show that melting and crustal differentiation can transform accretionary wedge sediments into vertically stratified and stable continental crust. This may be a key mechanism contributing to the peripheral continental growth worldwide.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

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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

2016

Kód důvěrnosti údajů

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

Název periodika

Tectonics

ISSN

0278-7407

e-ISSN

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Svazek periodika

35

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

23

Strana od-do

3095-3118

Kód UT WoS článku

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EID výsledku v databázi Scopus

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