Physics – Geophysics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3819308s&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 19, CiteID L19308
Physics
Geophysics
Geochronology: Radioisotope Geochronology, Marine Geology And Geophysics: Oceanic Hotspots And Intraplate Volcanism, Marine Geology And Geophysics: Plate Tectonics (8150, 8155, 8157, 8158), Mineralogy And Petrology: Intra-Plate Processes (1033, 8415), Mineralogy And Petrology: Igneous Petrology
Scientific paper
Voluminous Late Permian flood basalt eruptions are contemporaneous with the mid-Capitanian (260 Ma) and end-Permian (251 Ma) mass extinction events. The Panjal Traps of Kashmir are thought to be correlative to the mid-Capitanian mass extinction however no radiometric age has been determined. We report a single zircon U-Pb laser ablation ICP-MS date of a rhyolite from the lower-middle part of the volcanic sequence. Twenty-four individual zircon crystals yield a mean 206U/238Pb age of 289 ± 3 Ma. The results show that the Panjal Traps are considerably older than previously interpreted and not correlative to post-Neo-Tethys rifting of the Gondwanan margin or the mid-Capitanian mass extinction and are, in fact, correlative to the opening of the Neo-Tethys Ocean. In contrast to other similarly size large igneous provinces, the Panjal Traps are not coincident with a mass extinction event and therefore casts doubt on the direct relationship between continental flood basalt volcanism and ecosystem collapse.
Bhat G. M.
Brookfield M. E.
Jahn Bor-Ming
Shellnutt J. G.
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