印度中部邦德尔康德克拉通镁质高K花岗岩的地球化学和岩石成因：地壳演化的新见解

IF 1.4 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Acta Geochimica Pub Date : 2024-07-10 DOI:10.1007/s11631-024-00717-y

Shailendra K. Prajapati, Meraj Alam, Parashar Mishra, Hemant Kumar

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引用次数: 0

摘要

本德尔汉德克拉通对保存古太古代至新太古代的多期花岗岩类岩浆活动具有重要意义。它由多种花岗岩石组成，包括ttg、sanukitoids和高钾花岗岩石。研究结果表明，花岗岩类具有高硅含量（68.97 wt.% ~ 73.99 wt.%）、低硅含量（58.73 wt.% ~ 69.94 wt.%）、高K2O含量（2.77 wt.% ~ 6.16 wt.%）的地球化学特征。目的本德尔坎德克拉通的花岗岩浆活动和地球动力学资料不够完备。本研究的地球化学数据将用于进一步了解花岗质岩石的成因、来源、岩石成因及其对地球动力学演化的意义。方法采集21份样品，进行主量、痕量、稀土元素分析。采用x射线荧光光谱法（XRF）测定主元素，ICP-MS分析微量元素和稀土元素。遵循了印度地质调查局的标准程序。结果花岗岩类岩石地球化学特征为高硅（68.97 ~ 73.99 wt. %）、低硅（58.73 ~ 69.94 wt. %）、高K2O (2.77 ~ 6.16 wt. %)，属花岗闪长岩。岩石为钙质、钙质、镁质，成分从过铝质到铝质不等。稀土元素模式显示出较强的轻稀土富集，且明显的负Eu异常对应于较早的斜长石分馏。多元素谱图显示Nb、Sr、P、Ti呈负异常，Pb呈正异常。结论地球化学特征与碰撞后岩浆生成和大陆地壳污染有关。研究的岩石表现为a型和a2型谱系，表明它们起源于过渡/碰撞后构造活动时期大陆地壳的熔融。本德尔坎德克拉通混合花岗岩类的形成与这些构造过程中浅部岩浆房混合岩浆的分选作用有关。

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Geochemistry and petrogenesis of magnesian high-K granitoids from Bundelkhand Craton, Central India: New insights into crustal evolution

Background

The Bundelkhand Craton is significant for preserving the multiphase granitoids magmatism from Paleoarchean to Neoarchean periods. It consists of a variety of granite rocks, including TTGs, sanukitoids, and high-K granitoids. This study presents geochemical characteristics of high-silica (68.97 wt.%–73.99 wt.%), low-silica (58.73 wt.%–69.94 wt.%), and high K₂O (2.77 wt.%–6.16 wt.%) contents of granitoids.

Objective

The data on Bundelkhand Craton's granitic magmatism and geodynamics is not sufficiently robust. Geochemical data from this study will be used to further understand the origin, source, and petrogenesis of granitoid rocks and their implications for the evolution of geodynamics.

Methodology

Twenty-one samples were collected and analyzed for major, trace, and REE elements. Major elements were measured using X-ray fluorescence spectrometry (XRF), and trace and REE elements were analyzed by ICP-MS. Standard procedures from the Geological Survey of India were followed.

Results

The geochemical analysis presents high-silica (68.97-73.99 wt. %), low-silica (58.73-69.94 wt. %), and high K2O (2.77-6.16 wt. %) contents in granitoids, classified as granite-granodiorite. The rocks are calcic to calcalkalic, magnesian, and range from peraluminous to metaluminous composition. REE patterns showed strong LREE enrichment relative to HREEs, with prominent negative Eu anomalies corresponding to earlier plagioclase fractionation. Multi-element patterns revealed negative anomalies in Nb, Sr, P, and Ti and positive anomalies in Pb.

Conclusion

The geochemical signatures attributed to the post-collisional magma generation and continental crustal contamination. The studied rocks show A-type and A2-type lineage, suggesting they originated from the melting of continental crust during transitional/post-collisional tectonic activity. The formation of hybrid granitoids in the Bundelkhand Craton is connected to the fractionation of hybrid magmas in shallow-seated magma chambers during these tectonic processes.

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来源期刊

Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-

CiteScore

2.80

自引率

6.20%

发文量

1134

期刊介绍： Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.