Abstract

The magnetic properties of Tirupati red sandstones of Middle Cretaceous age from Godavary Valley, India, have been investigated. The results of studies on the Qn ratio, remanent coercive force, Curie temperature and chemical demagnetization tests are reported. The rocks were found to have a Qn ratio varying from 0.5 to 14, a high remanent coercive force of the order of 2000–6000 Oe and a Curie temperature of nearly 680°C. The NRM of the rocks seems to be a chemical remanent magnetization with hematic being responsible for the various properties observed.

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