Post-K/PB younger ⁴⁰Ar–³⁹Ar ages of the Mandla lavas: Implications for the duration of the Deccan volcanism Public Deposited

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  • We present new age determinations, derived from ⁴⁰Ar–³⁹Ar incremental heating experiments, for basaltic lava flows from the Mandla lobe, located on the eastern margin of the main Deccan volcanic province, some ~ 1000 km from the Western Ghats escarpment. The most reliable estimates of crystallization ages come from 5 plateau ages from plagioclase separates, from a stratigraphically controlled succession of 37 lava flows. We detect no statistically significant age difference from bottom to top (range 63-65 Ma) and calculate a weighted mean age for the section at 64.21 ± 0.33 Ma. These lava flows are significantly younger than the majority of the main Deccan volcanic activity documented from the Western Ghats (67-65 Ma). The new ages are consistent, however, with geochemical correlation of the Mandla lobe lavas with the uppermost succession (Poladpur-Ambenali-Mahabaleshwar Formations) of the SW Deccan, and indicate that this post K/PB youngest phase of flood basalt activity erupted over much of the province.
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  • Shrivastava, J. P., Duncan, R. A., & Kashyap, M. (2015). Post-K/PB younger 40Ar–39Ar ages of the Mandla lavas: Implications for the duration of the Deccan volcanism. Lithos, 224-225, 214-224. doi:10.1016/j.lithos.2015.03.006
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  • 224-225
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  • We acknowledge Department of Science and Technology, Government of India for financial support towards this work in the form of a Project Grant (No. ESC/16/286/2006).
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