No K/T boundary at Anjar, Gujarat, India: Evidence from magnetic susceptibility and carbon isotopes |
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| Authors: | H J Hansen D M Mohabey P Toft |
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| Institution: | (1) Geological Institute, Oster Voldgade 10, DK-1350, Denmark;(2) Geological Survey of India, Seminary Hills, 440 006 Nagpur, India |
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| Abstract: | The paper describes the variation pattern of magnetic susceptibility of Lameta sediments and isotopic variation of organic13C from Chui Hill, Bergi, Kholdoda, Pisdura and Girad. The susceptibility pattern and a negative carbon isotopic anomaly allows
fixation of the K/T boundary at these localities and they differ in these aspects from the inter-trappean sediments at Anjar.
Paleomagnetic measurements of the Anjar sediment and the overlying basalt flow demonstrate reversed polarity. The Lameta sediments
with dinosaur nests at Kheda and the overlying intertrappean sediments are of normal polarity.
The clay layers at Anjar, associated closely with Ir-enrichments, are strongly leached, rhyolitic bentonites containing low-quartz
paramorphs after high-quartz with glass inclusions.
It is concluded, that the inter-trappean lake deposits at Anjar were deposited in the early part of magnetochron 29R and are
unrelated to the K/T boundary. |
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| Keywords: | Iridium rhyolites paleomagnetics Deccan Lameta |
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