40Ar/39Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary
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 Deccanmagmatism and of its environmental impact relies on precise and accurate...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Geological Society Publishing House
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/18546 |
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| author | Parisio, L. Jourdan, Fred Marzoli, A. Melluso, L. Sethna, S. Bellieni, G. |
| author_facet | Parisio, L. Jourdan, Fred Marzoli, A. Melluso, L. Sethna, S. Bellieni, G. |
| author_sort | Parisio, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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 Deccanmagmatism and of its environmental impact relies on precise and accurate geochronological analyses.We present new40Ar/39Ar 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 magmatismrelated to the northward Indian platemovement 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. |
| first_indexed | 2025-11-14T07:26:17Z |
| format | Journal Article |
| id | curtin-20.500.11937-18546 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:26:17Z |
| publishDate | 2016 |
| publisher | Geological Society Publishing House |
| recordtype | eprints |
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| spelling | curtin-20.500.11937-185462017-09-13T13:46:02Z 40Ar/39Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary Parisio, L. Jourdan, Fred Marzoli, A. Melluso, L. Sethna, S. Bellieni, G. 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 Deccanmagmatism and of its environmental impact relies on precise and accurate geochronological analyses.We present new40Ar/39Ar 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 magmatismrelated to the northward Indian platemovement 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. 2016 Journal Article http://hdl.handle.net/20.500.11937/18546 10.1144/jgs2015-133 Geological Society Publishing House restricted |
| spellingShingle | Parisio, L. Jourdan, Fred Marzoli, A. Melluso, L. Sethna, S. Bellieni, G. 40Ar/39Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary |
| title | 40Ar/39Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary |
| title_full | 40Ar/39Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary |
| title_fullStr | 40Ar/39Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary |
| title_full_unstemmed | 40Ar/39Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary |
| title_short | 40Ar/39Ar ages of alkaline and tholeiitic rocks from the northern Deccan Traps: implications for magmatic processes and the K–Pg boundary |
| title_sort | 40ar/39ar ages of alkaline and tholeiitic rocks from the northern deccan traps: implications for magmatic processes and the k–pg boundary |
| url | http://hdl.handle.net/20.500.11937/18546 |