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Geochronological and genetic characterization of basaltic basement from western offshore basins in India

Gupta, Piyush, Rathore, Shakti Singh, Singh, Sandeep·2024·Geoscience Frontiers
DOI 10.1016/j.gsf.2024.101871
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Abstract

40 Ar- 39 Ar geochronology, geochemistry, and Sr-Nd isotopic compositions of 30 core samples from 24 offshore drill wells in the Western offshore basins have been used to characterize the genetics of the volcanic basement from the Kutch, Mumbai, and Kerala-Konkan offshore basins. Findings from the volcanic basement rocks demonstrate extremely varied isotopic and geochemical fingerprints, which are suggestive of significantly diverse parent magma compositions and emplacement processes. Basaltic tholeiitic basement from Kutch Offshore basin has Ar-Ar ages that range between 60 Ma and 62 Ma. This basement is characterised by a within-plate basalt signature, with depleted isotopic signatures similar to least contaminated Deccan Traps basalts, and a component of subducted crustal material. Basaltic basement from Mumbai Offshore Basin has eruption ages between 63 Ma and 65 Ma and show a strong within-plate OIB affinity. Geochemical and isotopic signatures are consistent with Renuion lavas and an enriched-end member of Deccan Traps basalts. However, Kerala-Konkan Offshore Basin shows significant E-MORB affinity and is characterized by primitive-mantle signatures and least contamination from the upper continental crust, with ages of eruption between 60 Ma and 61 Ma based on obtained 40 Ar- 39 Ar ages. The study suggests that the Mumbai Offshore Basalts’ mode of the eruption was comparable with onshore Deccan volcanism, whereas the basaltic basement in Kutch Offshore was formed after…

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Cited by

Metadata

Authors
Gupta, P., Rathore, S. S., & Singh, S.
Venue
Geoscience Frontiers
Publisher
Elsevier BV
Published
2024-09
Volume
15
Issue
5
Pages
101871
ISSN
1674-9871
DOI
10.1016/j.gsf.2024.101871
Cited by
5
References
2
Language
en
Licence
Funders
Oil and Natural Gas Corporation

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