Palaeomagnetism and ages of dolerite dykes in Karimnagar District, Andhra Pradesh, India

Abstract

Summary. Results of palaeomagnetic investigations of three dolerite dykes in Karimnagar District, Andhra Pradesh, India are reported. The remanent magnetic directions of specimens from one dyke, called A, fall into two groups, one with a positive inclination and the other with a negative inclination, indicating two intrusions. For dykes B and C, the remanent magnetic directions show a negative inclination. The pole positions for all these dykes are close to those for the Gwalior Traps, whose age is 1830±200 Myr. It is inferred that these dykes were emplaced over a short span of time around the Gwalior Trap period, which may represent a phase of multiple igneous activity. Copyright © 1985, Wiley Blackwell. All rights reserved