Origin and Tectonic Implications of I-type Granites, North Delhi Fold Belt, NW, India: Insights from Whole Rock Geochemistry and Mineral Compositions

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of the Geological Society of India Pub Date : 2023-12-20 DOI:10.1007/s12594-023-2521-8

Naveen Kumar Kanyan, Naresh Kumar, Swati Rana, Naveen Kumar, A. Krishnakanta Singh

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Abstract

A comprehensive whole-rock geochemical and mineral chemistry study was carried out of granites from the Narnaul and surrounding isolated hills of North Delhi Mobile Belt, NW India to constrain their genesis, and tectonic environment. The distinctive features of granites are meta to peraluminous nature and decreasing trend of P₂O₅ with high SiO₂ (>71%) ascribed to its metaigneous origin. In detail the chemical diversity of the studied samples is reflected by their affinity to Calc-alkaline to shoshonite series with high K₂O/Na₂O (mostly>1), low MgO (< 0.11%) and variation in Mg# (upto 0.5) and maficity with increasing SiO₂. The positive Eu anomalies, high LILE, highly enriched LREE (La/Sm = 4.13@#@19.33) pattern and comparatively elevated concentrations of Cs, La, Ta, Dy, Zr, Pb and Yb suggest different episodes of magmatic differentiation. Our data indicate that melting of older subduction-related igneous rocks and the underwent fractional crystallization in hydrous conditions is the possible mechanism for the generation of I-type granites in collisional tectonic setting.

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印度西北部北德里褶皱带 I 型花岗岩的起源和构造影响：从全岩地球化学和矿物成分中获得的启示

对印度西北部北德里移动带纳尔瑙尔及周边孤立山丘的花岗岩进行了全面的全岩地球化学和矿物化学研究，以确定其成因和构造环境。花岗岩的显著特点是元铝质到过铝质，P2O5 呈下降趋势，SiO2 含量高（71%），这归因于它的元成岩成因。具体而言，所研究样品的化学多样性体现在它们属于钙碱性至霰石岩系列，具有高 K2O/Na2O（大部分为 1）、低 MgO（0.11%）以及随着二氧化硅的增加而变化的 Mg#（高达 0.5）和岩性。正Eu异常、高LILE、高富集LREE（La/Sm = 4.13@#@19.33）模式以及相对较高的Cs、La、Ta、Dy、Zr、Pb和Yb浓度表明岩浆分异的不同时期。我们的数据表明，在碰撞构造环境中，较古老的俯冲相关火成岩熔融并在含水条件下经历分块结晶是生成 I 型花岗岩的可能机制。

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来源期刊

Journal of the Geological Society of India 地学-地球科学综合

CiteScore

2.20

自引率

7.70%

发文量

233

审稿时长

6 months

期刊介绍： The Journal aims to promote the cause of advanced study and research in all branches of geology connected with India, and to disseminate the findings of geological research in India through the publication.