Open AccessTHE CUDDAPAH BASIN IN INDIA AND CRUSTAL WARPING
Author(s) -
Glennie E. A.
Publication year - 1951
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1951.tb06276.x
Subject(s) - geology , structural basin , crust , image warping , gravity anomaly , paleontology , geophysics , seismology , artificial intelligence , oil field , computer science
Summary Geological data are used to contour the bottom of the Cuddapah Basin, which is found to slope down eastward to a maximum depth of over 18,000 feet below sea‐level. Using these contours the geological effect on gravity at the surface due to the departure from normal density (2.67) of the pre‐Cambrian sediments in the Basin is calculated. Gravity anomalies over the Basin computed for density 2.67 are strongly negative, and these are increased by the geological corrections, since the average density of the sediments in the Basin is 2.74. Since it is probable that the underlying rocks, like those surrounding the Basin, have normal density, the defect of gravity is ascribed to a downwarping of the crust, which is assumed to have a total thickness of 30 km. Computation of the effect of downwarping to 18,000 feet gives results consistent with the gravity data. Crustal warping is briefly discussed, and a modified method of topographical reduction of gravity data is suggested.