Analysis of gravity field over Chhotanagpur Plateau and Bihar mica belt

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Authors:Verma, R. K.; Mukhopadhyay, M.; Ashraf, M. H.; Nag, A. K.; Satyanarayana, Y.
Author Affiliations:Primary:
Indian Sch. Mines, Dhanbad, India
Volume Title:Precambrian of the eastern Indian Shield
Volume Authors:Mukhopadhyay, D., editor
Source:Memoir - Geological Society of India, Vol.8, p.185-198; Precambrian of the eastern Indian Shield, India, 1987, edited by D. Mukhopadhyay. Publisher: Geological Society of India, Bangalore, India. ISSN: 0435-4001
Publication Date:1988
Note:In English. 16 refs. Gravity survey map; 1 table
Summary:The relationships of the average Bouger anomaly to average elevation over 15 minutes times 15 minutes areas was studied for the Ranchi and Netarhat plateaux. The relationship suggests that the density of the underlying crust is higher than that underneath the Singhbhum granite batholith. The gravity field over the Bihar mica belt is very complex. Gravity highs as well as lows are associated with mica schists. Very often, highs occur very close to quartzite bands. The gravity field along four profiles cutting across the mica schists has been interpreted in terms of two-dimensional models. Most of the highs are attributable to amphibolite bodies, whilst the lows have been interpreted in terms of granitic intrusives. [J.M.H.]
Subjects:Amphibolites; Bouguer anomalies; Distribution; Geophysical methods; Geophysical surveys; Granites; Gravity anomalies; Gravity methods; Igneous rocks; Intrusions; Metamorphic rocks; Mica group; Petrology; Plutonic rocks; Plutons; Rifting; Schists; Sheet silicates; Silicates; Surveys; Asia; Bihar India; India; Indian Peninsula; Chhotanagpur Plateaus; Gravity survey map
Abstract Numbers:90M/0973
Record ID:1989044246
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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