Petrogenesis of Neoproterozoic Adakite-Like Rocks in the Southwestern Part of the Western Dharwar Craton, South India

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F25%3A00638380" target="_blank" >RIV/67985831:_____/25:00638380 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1134/S0869591125700122" target="_blank" >https://link.springer.com/article/10.1134/S0869591125700122</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1134/S0869591125700122" target="_blank" >10.1134/S0869591125700122</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Petrogenesis of Neoproterozoic Adakite-Like Rocks in the Southwestern Part of the Western Dharwar Craton, South India

Popis výsledku v původním jazyce

The Elimala and Markanje Plutons in the Mangalore-Gundlupet Crustal Corridor of the southern part of the Western Dharwar Craton were investigated to elucidate their geochemistry, geochronology, and petrogenesis. Zircon geochemistry revealed high Hf concentrations (9019–10011 ppm), steep HREE enrichment, positive Ce anomalies, and negative Eu anomalies, typical of magmatic zircons derived from highly evolved melts. U–Pb dating of magmatic zircons from the Elimala Pluton yielded a Concordia age of 832 ± 4 Ma, indicating crystallization during the Neoproterozoic. Bulk-rock geochemical analyses classified the granitoids as calc-alkaline, metaluminous to weakly peraluminous, I-type granitoids. Rare earth element patterns and trace element compositions, such as high Sr/Y and low (Dy/Yb)N ratios, indicate derivation from the partial melting of thickened lower crustal rocks within the garnet and/or amphibole stability field. The studied rocks exhibit characteristics of adakite-like granitoids, displaying affinities to high-silica adakites but with distinct compositional features that differentiate them from slab-derived melts. Their petrogenesis is attributed to low-degree partial melting of thickened lower continental crust rather than fractional crystallization or slab melting. Zircon trace element signatures and bulk-rock chemistry collectively suggest a crustal origin with minimal post-magmatic alteration, supported by low loss-on-ignition values and immobile element behavior. These findings provide new insights into the diverse lithology and crustal evolution of the southern part of the Western Dharwar Craton during the Neoproterozoic and the processes that led to the formation of adakite-like rocks.

Název v anglickém jazyce

Petrogenesis of Neoproterozoic Adakite-Like Rocks in the Southwestern Part of the Western Dharwar Craton, South India

Popis výsledku anglicky

The Elimala and Markanje Plutons in the Mangalore-Gundlupet Crustal Corridor of the southern part of the Western Dharwar Craton were investigated to elucidate their geochemistry, geochronology, and petrogenesis. Zircon geochemistry revealed high Hf concentrations (9019–10011 ppm), steep HREE enrichment, positive Ce anomalies, and negative Eu anomalies, typical of magmatic zircons derived from highly evolved melts. U–Pb dating of magmatic zircons from the Elimala Pluton yielded a Concordia age of 832 ± 4 Ma, indicating crystallization during the Neoproterozoic. Bulk-rock geochemical analyses classified the granitoids as calc-alkaline, metaluminous to weakly peraluminous, I-type granitoids. Rare earth element patterns and trace element compositions, such as high Sr/Y and low (Dy/Yb)N ratios, indicate derivation from the partial melting of thickened lower crustal rocks within the garnet and/or amphibole stability field. The studied rocks exhibit characteristics of adakite-like granitoids, displaying affinities to high-silica adakites but with distinct compositional features that differentiate them from slab-derived melts. Their petrogenesis is attributed to low-degree partial melting of thickened lower continental crust rather than fractional crystallization or slab melting. Zircon trace element signatures and bulk-rock chemistry collectively suggest a crustal origin with minimal post-magmatic alteration, supported by low loss-on-ignition values and immobile element behavior. These findings provide new insights into the diverse lithology and crustal evolution of the southern part of the Western Dharwar Craton during the Neoproterozoic and the processes that led to the formation of adakite-like rocks.

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

2025

Kód důvěrnosti údajů

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

Název periodika

PETROLOGY

ISSN

0869-5911

e-ISSN

1556-2085

Svazek periodika

33

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

27

Strana od-do

395-421

Kód UT WoS článku

001550570500002

EID výsledku v databázi Scopus

2-s2.0-105013121208