Magnetic characteristics of a part of Closepet Granite, Eastern Dharwar Craton,Journal of Earth System Science

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Magnetic characteristics of a part of Closepet Granite, Eastern Dharwar Craton
Journal of Earth System Science ( IF 1.9 ) Pub Date : 2021-05-15 , DOI: 10.1007/s12040-021-01588-0
S Parveen Begum , M Prasanthi Lakshmi , D Seshu , Rama Rao Ch

Abstract

The exposed granite gneissic complex to the west of Cuddapah basin in Eastern Dharwar Craton (EDC) is studied to understand the magnetic character of various plutons in this region with more emphasis on a part of Closepet Granite (CG). The NW–SE trending plutons in this region show gradual decrease in magnetic intensities from southwest to northeast; CG in the southwest corner of the study area have high mafic content, and there onwards show a depletion in mantle enrichment towards NE. Parts of the CG namely, the main mass and northern intrusions separated by a gap zone are differentiated based on magnetic character deduced by processing the aeromagnetic data. Reduced to the pole (RTP) and its upward continued maps revealed NNW trending eastward convex anomaly highs inferring the magnetic nature of CG due to Porphyritic Monzogranite (PMG). Gap zone is identified to be structurally significant, bounded by deep ENE faults and inferred to be associated with PMG at relatively deeper levels. 2.5D modelling of magnetic anomaly profile substantiated our qualitative analysis of magnetic anomalies over CG, inferring magnetic and non-magnetic units of CG. Known shear zones running north–south are identified with a few inferred shears revealed from magnetic data interpretation within CG.

Research Highlights

Understanding the magnetic character of various plutons in the regions using aeromagnetic data with a detailed study over a part of Closepet Granite.
The NW–SE trending plutons in this region show gradual decrease in magnetic intensities from southwest to northeast.
Parts of the CG namely, the main mass and northern intrusions separated by a gap zone are differentiated based on magnetic character deduced by processing the aeromagnetic data, reduced to the pole (RTP) and its upward continued maps.
Gap zone is identified to be structurally significant, bounded by deep ENE faults and inferred to be associated with PMG at relatively deeper levels.
2.5D modelling of magnetic anomaly profile substantiated our qualitative analysis of magnetic anomalies over CG, inferring magnetic and non-magnetic units of CG.

中文翻译：

达瓦尔克拉通东部Closepet花岗岩的一部分的磁学特征

摘要

研究了东部Dharwar Craton（EDC）的Cuddapah盆地以西的裸露花岗岩片麻岩复合体，以了解该地区各种岩体的磁性特征，其中更着重于Closepet Granite（CG）的一部分。该区域的西北-东南向型俯冲体显示出从西南到东北的磁强度逐渐降低；研究区西南角的CG具有较高的镁铁质含量，并且此后显示出对NE的地幔富集度下降。CG的各个部分，即由间隙区域分隔的主要侵入体和北部侵入体，是根据通过处理航空磁数据得出的磁特性来区分的。简化到极点（RTP）及其向上连续的地图显示，NNW趋势向东凸异常高点，归因于斑状Monzogranite（PMG）推导了CG的磁性。间隙带被认为在结构上很重要，由深层ENE断层界定，并被认为与PMG处于相对较深的水平有关。磁异常剖面的2.5D建模证实了我们对CG上磁异常的定性分析，从而推断出CG的磁性和非磁性单位。从CG内的磁数据解释中揭示的一些推断剪切，可以确定从北向南延伸的已知剪切带。