H J Hansen
Articles written in Journal of Earth System Science
Volume 110 Issue 2 June 2001 pp 133-142
No K/T boundary at Anjar, Gujarat, India: Evidence from magnetic susceptibility and carbon isotopes
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.
Volume 111 Issue 4 December 2002 pp 493-497
Reply to the comments by A D Shukla and P N Shukla
Volume 132, 2023
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