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Relation of gravity to elevation and rejuvenation of blocks in India

1971; American Geophysical Union; Volume: 76; Issue: 2 Linguagem: Inglês

10.1029/jb076i002p00545

2156-2202

M. N. Qureshy,

Geophysics and Gravity Measurements

Journal of Geophysical Research (1896-1977)Volume 76, Issue 2 p. 545-557 Relation of gravity to elevation and rejuvenation of blocks in India M. N. Qureshy, M. N. QureshySearch for more papers by this author M. N. Qureshy, M. N. QureshySearch for more papers by this author First published: 10 January 1971 https://doi.org/10.1029/JB076i002p00545Citations: 42AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract An analysis of free-air, Bouguer, Pratt-Hayford (D = 113.7 km), and Airy-Heiskanen (T = 30 km) anomalies visa vis elevation in India indicates that on an over-all basis isostatic equilibrium prevails in India. Regression study of Bouguer anomalies versus elevation made by grouping the data according to tectonic and geologic units shows that the Bouguer anomaly decreases rather slowly with the increase in elevation over the Himalayas, Aravallis, Nilgiris, Eastern Ghats and the Assam plateau, all of which are post-Mesozoic rejuvenated blocks of the Archaean shield. Small, and sometimes even positive regression coefficients characterize these blocks; the isostatic anomalies are found to be near zero or positive. It is concluded that the uplifting of these shield blocks has probably taken place through movement and incorporation of material from the upper mantle into the crust. 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