Geochemical investigations of weathered amphibolite enclave from southern Bundelkhand region, central India

IF 1.827 Q2 Earth and Planetary Sciences Arabian Journal of Geosciences Pub Date : 2024-04-11 DOI:10.1007/s12517-024-11955-y

Khalid M. Ghasera, Shaik A. Rashid

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Abstract

The present study investigates the chemical weathering characteristics of an amphibolite enclave within granite from Bundelkhand region, central India. The mineral composition varies from core to rind with depletion of hornblende and plagioclase and enrichment of clay minerals and oxyhydroxides. The chemical index of weathering (CIA) indicates an incipient stage of weathering, within the enclave (CIA = 52.22 – 54.74). A-CN-K (Al₂O₃-CaO + Na₂O-K₂O) plot reveal samples plot along the A-CN line, indicating the removal of Ca and Na, due to plagioclase destruction. The weathering trend progresses towards the formation of smectite, a significant component within the clay composition of the enclave. The results of mass balance calculation reveal a substantial mass decrease of approximately 50% to 82% in the amphibolite. Furthermore, major oxides in the amphibolite enclave, experience significant losses. Trace elements display general losses in the enclave. This study provides valuable insights into the complex dynamics of elemental behavior during weathering by shedding light on the processes shaping the geochemical evolution of these rock types and their response to weathering conditions.

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印度中部邦德尔坎德邦南部风化闪长岩飞地的地球化学研究

本研究调查了印度中部邦德尔康德地区花岗岩中一块闪长岩飞地的化学风化特征。从岩心到外皮，矿物成分各不相同，角闪石和斜长石含量减少，粘土矿物和氧氢氧化物含量增加。风化化学指数（CIA）表明飞地内的风化处于初始阶段（CIA = 52.22 - 54.74）。A-CN-K（Al2O3-CaO + Na2O-K2O）图显示，样品沿 A-CN 线分布，表明由于斜长石的破坏，Ca 和 Na 被移除。风化趋势朝着形成软玉石的方向发展，软玉石是 "飞地 "粘土成分中的重要组成部分。质量平衡计算的结果显示，闪长岩的质量大幅下降了约 50%至 82%。此外，闪长岩飞地中的主要氧化物也有大量损失。微量元素在 "飞地 "中也普遍损失。这项研究通过揭示这些岩石类型的地球化学演变过程及其对风化条件的响应，为了解风化过程中元素行为的复杂动态提供了宝贵的见解。

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来源期刊

Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-

自引率

0.00%

发文量

1587

审稿时长

6.7 months

期刊介绍： The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.