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Palaeomagnetism of the uppermost carbonate units of the Purana basins in southern India: new demagnetization results from the Kaladgi and Bhima basins, Karnataka

Published online by Cambridge University Press:  19 November 2020

Herve Wabo Open the ORCID record for Herve Wabo [Opens in a new window] ,
Michiel Olivier De Kock ,
Nicolas Johannes Beukes  and
Venkatraman Seetaram Hegde
Herve Wabo*
Affiliation:
Department of Science and Innovation, National Research Foundation, Centre of Excellence for Integrated Mineral and Energy Resource Analysis (DSI-NRF CIMERA) and Paleoproterozoic Mineralization Research Group (PPM Research Group), Department of Geology, University of Johannesburg, PO Box 524, Auckland Park 2006, Johannesburg, South Africa
Michiel Olivier De Kock
Affiliation:
Department of Science and Innovation, National Research Foundation, Centre of Excellence for Integrated Mineral and Energy Resource Analysis (DSI-NRF CIMERA) and Paleoproterozoic Mineralization Research Group (PPM Research Group), Department of Geology, University of Johannesburg, PO Box 524, Auckland Park 2006, Johannesburg, South Africa
Nicolas Johannes Beukes
Affiliation:
Department of Science and Innovation, National Research Foundation, Centre of Excellence for Integrated Mineral and Energy Resource Analysis (DSI-NRF CIMERA) and Paleoproterozoic Mineralization Research Group (PPM Research Group), Department of Geology, University of Johannesburg, PO Box 524, Auckland Park 2006, Johannesburg, South Africa
Venkatraman Seetaram Hegde
Affiliation:
Civil Engineering Department, Sri Dharmasthala Manjunatheshwara (SDM) College of Engineering and Technology, Dharwar580 002, Karnataka, India
*
Author for correspondence: Herve Wabo, Email: hwabo@uj.ac.za
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Abstract

Four unconformity-bound sequences can be identified in the Purana successions in southern India, of which the third sequence (Sequence III) has the widest distribution. Sequence III contains deep-water carbonate units with consistent sedimentological characteristics across the subcontinent. The current extent of field relationships and existing ages has not allowed the correlation and chronology of these carbonates to be established conclusively. Palaeomagnetism may help resolve this essential question for the Purana sedimentation. Here, we report new palaeomagnetic results (HIG+/– pole: 21.7° N, 81.1° E, radius of cone of 95% confidence A95 = 15.9°) from Sequence III carbonates in the Kaladgi (Badami Group) and Bhima (Bhima Group) basins. The HIG+/– magnetization, revealed after the removal of secondary magnetizations that include a present-day field and an Ediacaran–Cambrian overprint, is interpreted to be primary based on its dissimilarity to known younger magnetizations, the presence of distinctly different magnetic components in sites and a positive reversal test. Our HIG+/– pole differs from the c. 1.4 Ga pole and various c. 1.1 Ga and younger poles. Instead, it overlaps with the Harohalli dyke pole that was long considered to be c. 823 Ma in age, but has recently been suggested to be much older with an age of c. 1192 Ma. We therefore consider the uppermost carbonate beds of Badami and Bhima groups to have been deposited during late Mesoproterozoic times. A critical evaluation of parameters from which an earlier Neoproterozoic age for these carbonates was established indicates that the available 40Ar/39Ar, Rb–Sr and U–Pb ages in the Kaladgi and Bhima basins could reflect the timing of post-depositional alteration events.

Keywords

southern IndiaPurana basinsunconformity-bound Sequence IIIcarbonatespalaeomagnetism
Type
Original Article
Information
Geological Magazine , Volume 159 , Issue 2: Mesoproterozoic Basins recording Earth’s Middle Age , February 2022 , pp. 269 - 278
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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