Palaeomagnetism and rock magnetism of the Deccan traps |
| |
| Authors: | C Radhakrishnamurty K V Subbarao |
| |
| Institution: | (1) Tata Institute of Fundamental Research, 400 005 Bombay, India;(2) Department of Earth Sciences, Indian Institute of Technology, 400 076 Bombay, India |
| |
| Abstract: | Extensive work on the palaeomagnetism of the Deccan traps by several workers has revealed only one reversal (normal-reverse-normal)
of the geomagnetic field during the period of eruption of these flows. The scatter in the natural remanent magnetic directions
of different flows in a sequence of these traps is rather large and it persists even after magnetic cleaning. Generally this
large scatter of directions is attributed to the geomagnetic secular variation during formation of the traps. Recent studies
of the magnetic properties of the trap samples indicate that the presence of multidomain magnetite in a lava sequence differs
from locality to locality in the Deccan trap province and so the stability of their natural remanent magnetization. While
these features can be clearly perceived, an understanding of the same seems to be quite difficult. However, it appears that
part of the scatter in directions could be due to the alteration of the magnetic minerals in the Deccan traps and hence it
would not be proper to relate the entire scatter to the secular variation. |
| |
| Keywords: | Palaeomagnetism Deccan traps domian states rock magnetism |
| 本文献已被 SpringerLink 等数据库收录！ |
