Petrography, U–Pb geochronology and geochemistry of Varcheh intrusions: Insight into younging trend of mid-Cretaceous subduction in the northern Sanandaj–Sirjan Zone, western Iran

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F24%3A00587292" target="_blank" >RIV/67985831:_____/24:00587292 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/gj.5001?af=R" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/gj.5001?af=R</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/gj.5001" target="_blank" >10.1002/gj.5001</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Petrography, U–Pb geochronology and geochemistry of Varcheh intrusions: Insight into younging trend of mid-Cretaceous subduction in the northern Sanandaj–Sirjan Zone, western Iran

Popis výsledku v původním jazyce

The Neotethyan Sanandaj–Sirjan Zone of western Iran has recorded major magmatic activities due to its continental arc tectonic setting during the Mesozoic. The Varcheh mafic intrusions were less-studied plutons in the northern Sanandaj–Sirjan Zone (SSZ). Field evidence, petrography, geochemistry and U–Pb geochronological data were used to determine petrographic composition, geochemical nature, crystallization age and also to suggest a conceptual tectonomagmatic model for their emplacement. Small plutonic bodies are dominantly composed of monzogabbro that have intruded into the Cretaceous sedimentary rocks. Based on U–Pb zircon datings, these rocks have crystallized at 125–118 Ma in late Early Cretaceous (Barremian–Aptian), and are older than the supposed ages reported on geological maps. Varcheh rocks are not just typical calc-alkaline rocks and some show alkaline affinity. Negative anomalies in Nb–Ta–Ti and enrichments in some large-ion lithophile elements on spider diagrams are consistent with a subduction-zone setting. Potential deep source for magma generation is partial melting of subcontinental lithospheric mantle wedge above a subducting slab of oceanic lithosphere. The spaces for the Varcheh mafic intrusions are accommodated by dominant dextral strike-slip movement in a continental arc experiencing extension during late Early Cretaceous subduction. According to the zircon U–Pb geochronology results in this paper and previous U–Pb ages in the northern part of the SSZ, the mid-Cretaceous magmatism reveals a significant NW-ward younging trend and migration of the magmatic arc from the Barremian–Aptian in south-east to the Albian–Cenomanian in the north-west.

Název v anglickém jazyce

Petrography, U–Pb geochronology and geochemistry of Varcheh intrusions: Insight into younging trend of mid-Cretaceous subduction in the northern Sanandaj–Sirjan Zone, western Iran

Popis výsledku anglicky

The Neotethyan Sanandaj–Sirjan Zone of western Iran has recorded major magmatic activities due to its continental arc tectonic setting during the Mesozoic. The Varcheh mafic intrusions were less-studied plutons in the northern Sanandaj–Sirjan Zone (SSZ). Field evidence, petrography, geochemistry and U–Pb geochronological data were used to determine petrographic composition, geochemical nature, crystallization age and also to suggest a conceptual tectonomagmatic model for their emplacement. Small plutonic bodies are dominantly composed of monzogabbro that have intruded into the Cretaceous sedimentary rocks. Based on U–Pb zircon datings, these rocks have crystallized at 125–118 Ma in late Early Cretaceous (Barremian–Aptian), and are older than the supposed ages reported on geological maps. Varcheh rocks are not just typical calc-alkaline rocks and some show alkaline affinity. Negative anomalies in Nb–Ta–Ti and enrichments in some large-ion lithophile elements on spider diagrams are consistent with a subduction-zone setting. Potential deep source for magma generation is partial melting of subcontinental lithospheric mantle wedge above a subducting slab of oceanic lithosphere. The spaces for the Varcheh mafic intrusions are accommodated by dominant dextral strike-slip movement in a continental arc experiencing extension during late Early Cretaceous subduction. According to the zircon U–Pb geochronology results in this paper and previous U–Pb ages in the northern part of the SSZ, the mid-Cretaceous magmatism reveals a significant NW-ward younging trend and migration of the magmatic arc from the Barremian–Aptian in south-east to the Albian–Cenomanian in the north-west.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Geological Journal

ISSN

0072-1050

e-ISSN

1099-1034

Svazek periodika

59

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

19

Strana od-do

2156-2174

Kód UT WoS článku

001248156500001

EID výsledku v databázi Scopus

2-s2.0-85196206878