A study of the evolution of the Proterozoic Cuddapah Basin, south India.
Item
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Title
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A study of the evolution of the Proterozoic Cuddapah Basin, south India.
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Identifier
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AAI9707150
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identifier
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9707150
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Creator
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Schleifer, Stanley.
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Contributor
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Adviser: Somdev Bhattacharji
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Date
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1996
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Language
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English
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Publisher
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City University of New York.
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Subject
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Geophysics | Geology
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Abstract
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The Cuddapah Basin of the peninsular Indian shield, is a Proterozoic, intracratonic, sedimentary basin. Questions have been raised concerning the mechanisms for the origin and evolution of this basin, and other Proterozoic basins on the Indian shield and about the relative vertical movements of sub-basins which have been identified within the Cuddapah Basin. Computer simulations of thermally induced basin development and evolution are used to address these questions. The simulations indicate that thermal driving forces can account for the development and evolution of the Cuddapah Basin and similar Proterozoic intracontinental basins. Model simulations of heat redistribution with time in crystalline rocks, indicate that a single magmatic event could not account for the 600 million to 1 billion year history of tectonic evolution of the Cuddapah Basin. Evidence derived from radioisotope dating of igneous rocks within, or near the basin, suggests that at least three distinct periods of magmatic activity, separated in time by over three hundred million years, were involved in the evolution of the Basin. Computer enhanced Landsat images of the Cuddapah Basin area have been enhanced, analyzed, and compared with deep seismic sounding (DSS) profiles across the basin to locate deep lithospheric fractures and/or faults which define boundaries of the basin and of sub-basin areas within the basin. The study suggests that the Cuddapah sub-basins were stress-decoupled from one another during their evolution and significant stresses due to vertical movements, were not transmitted across the pre-existing zones of weakness in the Archean lithosphere. This has enabled the sub-basins to exhibit independent vertical motion and to behave as yoked basins. Because of the significant differences in the geothermal and chemical environment of the crust and upper mantle during Proterozoic time as compared to Phanerozoic time, it is considered unlikely that Proterozoic intracratonic basins such as the Cuddapah Basin have Phanerozoic analogues.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
