Abstract
The paper reviews critically the present status of knowledge on the Precambrian orogenic cycles of India. The Precambrian age data obtained by Pb-U-Th, alpha-helium and Rb-Sr methods are presented cycle-wise, and the degree of dependability of each determination is indicated. The following cycles have so far been delineated — Dharwar (2300±100 M. Y.), Eastern Ghats (1625±75 M. Y.), Mahanadi (1350±200 M. Y.?), Satpura (955±40 M. Y.), Delhi (735±30 M. Y.) and Kishengarh (580±20 M. Y.) and it is shown that these cycles have equivalents in several parts of the world. These results are discussed in relation to the tectonics of India. A comprehensive programme of dating the Precambrian geological formations of India is suggested.
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