Petrogenesis of gneisses and granitoids from Southern Bastar Craton, India: A geochemical insight to crustal evolution

Soumya Mitra , Santa Dolui , Asutosh K Tripathy
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Abstract

This study investigates the geochemical evolution and petrogenesis of gneisses and granitoids from the southern part of the Bastar Craton, India, to understand the crustal evolution. The study incorporates the result on major, minor, trace and rare earth elements (REE) interpretation. The gneisses, classified as high alumina granodiorite to granite, peraluminous and exhibit geochemical signatures typical of Archaean TTGs, including enrichment in large ion lithophile elements (LILE) and depletion in high field strength elements (HFSE) with notable negative anomalies in elements like Nb, P, and Ti. In contrast, the granitoids show a meta-aluminous to per-aluminous composition, with higher K2O/Na2O ratios and pronounced enrichment in LILE with higher Sr, Ba, Zr, Nb, Y and Yb contents than the gneisses. These patterns suggest a progressive geochemical evolution from gneiss to granitoids. The study put forward two distinct subduction phases contributing to the formation of these rocks. The initial phase associated with a pre- to syn-collisional tectonic setting in a flat low-angle subduction at shallower depth and minimal interaction between slab melts and the mantle wedge. Whereas, the later one is characterized by a collision to subduction transition in a post-collisional setting with gradual increase in mantle-wedge interaction at a relatively greater depth, involving a steeply dipping subduction process. This dual-phase subduction model highlights the tectonic shift in the region over time and provides a comprehensive understanding of the geological evolution of the Bastar Craton.

Abstract Image

印度南巴斯塔克拉通的片麻岩和花岗岩类岩石成因:地壳演化的地球化学视角
本文研究了印度巴斯塔尔克拉通南部片麻岩和花岗岩类的地球化学演化和岩石成因,以了解地壳演化。该研究结合了主要、次要、微量和稀土元素(REE)的解释结果。片麻岩类型为高铝花岗闪长岩-过铝质花岗岩,具有太古宙TTGs的地球化学特征,主要表现为大离子亲石元素(LILE)富集和高场强元素(HFSE)亏缺,Nb、P、Ti等元素呈显著负异常。花岗岩类呈准铝-准铝组成,K2O/Na2O比值较高,LILE富集明显,Sr、Ba、Zr、Nb、Y、Yb含量高于片麻岩。这些模式表明地球化学从片麻岩到花岗质是一个渐进的演化过程。研究提出了两个不同的俯冲阶段对这些岩石的形成有贡献。初始阶段与前-同碰撞构造环境有关,在较浅深度处于低角度俯冲的平坦状态,板块熔体与地幔楔体之间的相互作用最小。后者的特点是在碰撞后的背景下由碰撞向俯冲转变,在相对较深的深度上,幔楔相互作用逐渐增加,涉及陡倾俯冲过程。这种双相俯冲模式突出了该地区随时间的构造转移,并提供了对巴斯塔克拉通地质演化的全面理解。
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CiteScore
4.70
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