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40 Ar/ 39 Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary

Parisio, Laura, Jourdan, Fred, Marzoli, Andrea, Melluso, Leone, Sethna, Sam F., Bellieni, Giuliano·2016·Journal of the Geological Society
DOI 10.1144/jgs2015-133
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Abstract

The Deccan large igneous province in India was emplaced temporally close to the Cretaceous–Palaeogene (K–Pg) boundary and is formed by tholeiitic flood basalts and less abundant alkaline rocks. Definition of the origin of Deccan magmatism and of its environmental impact relies on precise and accurate geochronological analyses. We present new 40 Ar/ 39 Ar ages from the northern sector of the province. In this area, tholeiitic and alkaline rocks were contemporaneously emplaced at 66.60 ± 0.35 to 65.25 ± 0.29 Ma in the Phenai Mata area, whereas rocks from Rajpipla and Mount Pavagadh yielded ages ranging from 66.40 ± 2.80 to 64.90 ± 0.80 Ma. The indistinguishable ages for alkaline and tholeiitic magmatism suggest that distinct mantle sources were synchronously active. The new ages are compared with previous ages, which were carefully screened and filtered and then recalculated to be comparable. The entire dataset of geochronological data does not support a time-related migration of the magmatism related to the northward Indian plate movement relative to the Reunion mantle plume. The main phase of magmatism, including the newly dated rocks from the northern Deccan, occurred at the K–Pg boundary. This suggests a causal link between the emplacement of the province and the K–Pg mass extinction. Supplementary material: Whole-rock and mineral compositions and the complete 40 Ar/ 39 Ar dataset are available at https://doi.org/10.6084/m9.figshare.c.2674441 .

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Metadata

Authors
Parisio, L., Jourdan, F., Marzoli, A., Melluso, L., Sethna, S. F., & Bellieni, G.
Affiliations
  • Dipartimento di Geoscienze, Università degli Studi di Padova, Via Gradenigo 6, 35131 Padova, Italy
  • Western Australian Argon Isotope Facility, JdL Centre & Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
  • Dipartimento di Scienze della Terra, Ambiente e Risorse, Università di Napoli Federico II, Via Mezzocannone 8, 80134 Napoli, Italy
  • Department of Geology, St. Xavier's College, Mumbai, 400001, India
Venue
Journal of the Geological Society
Publisher
Geological Society of London
Published
2016-03-09
Volume
173
Issue
4
Pages
679-688
ISSN
  • 0016-7649
  • 2041-479X
DOI
10.1144/jgs2015-133
Cited by
55
References
3
Language
en
Licence
doi.org/10.15223/policy-002 (stm-asf)

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