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Feeder and post Deccan Trap dyke activities in the northern slope of the Satpura Mountain: Evidence from new 40 Ar- 39 Ar ages
Abstract
We present new 40 Ar- 39 Ar plagioclase crystallization ages from the dykes exposed at the northern slope of the Satpura Mountain range near Betul-Jabalpur-Pachmarhi area, ∼800 km NE of the Western Ghats escarpment . Among the two plateau ages, the first age of 66.56 ± 0.42 Ma from a dyke near Mohpani village represents its crystallization age which is either slightly older or contemporaneous with the nearby Mandla lava flows (63–65 Ma). We suggest that the Mohpani dyke might be one of the feeders for the surrounding lava flows as these lavas are significantly younger than the majority of the main Deccan lavas of the Western Ghats (66.38–65.54 Ma). The second age of 56.95 ± 1.08 Ma comes from a younger dyke near Olini village which cuts across the lava flows of the area. The age correlates well with the Mandla lavas which are chemically similar to the uppermost Poladpur, Ambenali and Mahabaleshwar Formation lavas of SW Deccan. Our study shows that the dyke activities occurred in two phases, with the second one representing the terminal stage.
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“Other age data (Shrivastava et al., 2017) and the ages of fossils from an intertrappean in this sequence (Sonkusare et al., 2021) also justify the interpretation that the entire Satpura Group is definitely of Maastrichtian age and may host some of the oldest lavas in the DVP.”
From Spatio-temporal volume recalibration shows Deccan volcanism caused Terminal Cretaceous Mass Extinction (2026) · cites this paper as Shrivastava et al., 2017
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Cited by
Kale, V. S., Upasani, D., Rajput, M., Dole, G., & Pillai, S. P. (2026) · Geological Society of America Bulletin · doi:10.1130/b38412.1 · Cited by 3
Metadata
- Authors
- Shrivastava, J. P., Kumar, R., & Rani, N.
- Venue
- Geoscience Frontiers
- Publisher
- Elsevier BV
- Published
- 2017-05
- Volume
- 8
- Issue
- 3
- Pages
- 483-492
- ISSN
- 1674-9871
- Cited by
- 20
- References
- 0
- Language
- en
- Funders
- Department of Science and Technology (ESS/16/286/2006)
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- Shrivastava, J. P., Kumar, R., & Rani, N. (2017). Feeder and post Deccan Trap dyke activities in the northern slope of the Satpura Mountain: Evidence from new 40 Ar- 39 Ar ages. Geoscience Frontiers. https://doi.org/10.1016/j.gsf.2016.04.001