Magmatic recycling of accretionary wedge: A new perspective on Silurian-Devonian I-type granitoids generation in the Chinese Altai

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000014" target="_blank" >RIV/00025798:_____/20:00000014 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1342937X19302412" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1342937X19302412</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2019.07.019" target="_blank" >10.1016/j.gr.2019.07.019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Magmatic recycling of accretionary wedge: A new perspective on Silurian-Devonian I-type granitoids generation in the Chinese Altai

Popis výsledku v původním jazyce

The mechanism for generation of Silurian-Devonian hornblende-bearing I-type granitoids in the Chinese Altai still remains rather obscure. The possibility that they are derived from the regional anatexis of the Ordovician accretionary wedge, i.e., the Habahe Group, is investigated. The Habahe Group contains a large number of intermediate-to-basic components. These components occur mainly as interlayered volcanogenic bands or admixtures and less commonly as blocks varying in size from several meters to several hundreds of meters. Geochemically, this volcanogenic component is characterized by enrichment of large-ion lithophile elements relative to many of the high-field strength elements and rather radiogenic Nd isotopic signatures (epsilonNd(t): +4.1 to +9.1). Phase equilibrium and trace element modelling indicate that partial melting of the volcanogenic component at an attainable 900–1000&#8239;°C can produce 30–35&#8239;volpercent silicic melts that show a good chemical match, in terms of major element contents and trace element patterns, with those of the local I-type granitoids. Combined with regional available data, we suggest that Silurian-Devonian hornblende-bearing I-type granitoids could be derived from the partial melting of the volcanogenic components of the Habahe Group and previously inferred large input of mantle-derived magma is un-necessary. Regional anatexis of the Ordovician accretionary wedge led to the stabilization of the wedge, which may represent an important mechanism contributing to the formation of vertically stratified continental crust in accretionary orogens in general.

Název v anglickém jazyce

Magmatic recycling of accretionary wedge: A new perspective on Silurian-Devonian I-type granitoids generation in the Chinese Altai

Popis výsledku anglicky

The mechanism for generation of Silurian-Devonian hornblende-bearing I-type granitoids in the Chinese Altai still remains rather obscure. The possibility that they are derived from the regional anatexis of the Ordovician accretionary wedge, i.e., the Habahe Group, is investigated. The Habahe Group contains a large number of intermediate-to-basic components. These components occur mainly as interlayered volcanogenic bands or admixtures and less commonly as blocks varying in size from several meters to several hundreds of meters. Geochemically, this volcanogenic component is characterized by enrichment of large-ion lithophile elements relative to many of the high-field strength elements and rather radiogenic Nd isotopic signatures (epsilonNd(t): +4.1 to +9.1). Phase equilibrium and trace element modelling indicate that partial melting of the volcanogenic component at an attainable 900–1000&#8239;°C can produce 30–35&#8239;volpercent silicic melts that show a good chemical match, in terms of major element contents and trace element patterns, with those of the local I-type granitoids. Combined with regional available data, we suggest that Silurian-Devonian hornblende-bearing I-type granitoids could be derived from the partial melting of the volcanogenic components of the Habahe Group and previously inferred large input of mantle-derived magma is un-necessary. Regional anatexis of the Ordovician accretionary wedge led to the stabilization of the wedge, which may represent an important mechanism contributing to the formation of vertically stratified continental crust in accretionary orogens in general.

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

2020

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

78

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

291-307

Kód UT WoS článku

000522973500017

EID výsledku v databázi Scopus

2-s2.0-85074780069