Mathematics – Logic
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..71..173m&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 71, no. 1, Nov. 1984, p. 173-180.
Mathematics
Logic
12
Antarctic Regions, Geomagnetism, Igneous Rocks, India, Magnetic Anomalies, Geological Faults, Magnetization, Magsat Satellites
Scientific paper
The presence of a highly magnetic rock type, magnetized with an intensity of 900 nT in a direction whose azimuth is 150 deg and inclination +65 deg, is implied by magnetic anomalies over the east Indian coast's continental shelf; this suggests the occurrence of igneous volcanic rocks, as confirmed by samples found below Tertiary sediments. The direction of magnetization is the reverse of that reported for the Rajmahal Traps of the Cretaceous period, 100-110 million years ago. The reversed polarity of the rocks on the continental shelf suggests that they correspond to the M0 reversal of 115 million years ago. In the present reconstruction, the Mahanadi Gondwana graben on the Indian subcontinent falls into line with the Lambert Rift in Antarctica, suggesting a probable common ancestry.
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