Integration of remote sensing and geophysics in geological mapping of southern block of Chitradurga Schist Belt areas in upstream Cauvery basin, Western Dharwar Craton, Karnataka

Results in Earth Sciences Pub Date : 2025-07-17 DOI:10.1016/j.rines.2025.100117

Samarth Urs M, Nagendra P, B.V. Suresh Kumar

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Abstract

We present mapping and comparision of the geology of the southern block of the Chitradurga schist belt (CSB). We have used ASTER images and geophysical data to compare the geology. Consequently, present study confirms how remote sensing integrated with geophysical surveys can enhance the efficiency and accuracy of regional geological mapping. False colour composites, band ratios, rock indices (QI, MI, and CI), mineral indices, and broadband albedo were used for lithological mapping. Remote sensing results were correlated with digitized thematic geophysical data viz. gravity anomalies, magnetic and radiometric data. The results were validated with lithological data obtained from the Geological Survey of India. Results showed that southern portion of CSB is fringed within a gneiss and dominated by amphibolites interbedded with narrow quartzite bands. To its west, occurs a narrow belt of ultramafites and acidic intrusions. In some localities, the amphibolites are overlain by mica schists.

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遥感与地球物理结合在卡纳塔克邦Dharwar克拉通西部Cauvery盆地上游Chitradurga片岩带南段地质填图中的应用

本文对Chitradurga片岩带（CSB）南地块进行了地质填图和比较。我们使用ASTER图像和地球物理数据进行地质对比。因此，本研究证实了遥感与地球物理调查相结合可以提高区域地质填图的效率和精度。假彩色复合材料、波段比、岩石指数（QI、MI和CI）、矿物指数和宽带反照率用于岩性填图。遥感结果与数字化的专题地球物理数据，即重力异常、磁和辐射数据相关联。结果与印度地质调查局获得的岩性数据进行了验证。结果表明：南缘为片麻岩带，以角闪岩为主，并与狭窄的石英岩带互层。在它的西部，出现了一个狭窄的超镁铁和酸性侵入带。在某些地方，角闪岩上覆有云母片岩。

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Results in Earth Sciences

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