The eruptive tempo of Deccan volcanism in relation to the Cretaceous-Paleogene boundary
2019; American Association for the Advancement of Science; Volume: 363; Issue: 6429 Linguagem: Inglês
10.1126/science.aav1446
ISSN1095-9203
AutoresCourtney J. Sprain, Paul R. Renne, L. Vanderkluysen, Kanchan Pande, Stephen Self, Tushar Mittal,
Tópico(s)Geology and Paleoclimatology Research
ResumoLate Cretaceous records of environmental change suggest that Deccan Traps (DT) volcanism contributed to the Cretaceous-Paleogene boundary (KPB) ecosystem crisis. However, testing this hypothesis requires identification of the KPB in the DT. We constrain the location of the KPB with high-precision argon-40/argon-39 data to be coincident with changes in the magmatic plumbing system. We also found that the DT did not erupt in three discrete large pulses and that >90% of DT volume erupted in <1 million years, with ~75% emplaced post-KPB. Late Cretaceous records of climate change coincide temporally with the eruption of the smallest DT phases, suggesting that either the release of climate-modifying gases is not directly related to eruptive volume or DT volcanism was not the source of Late Cretaceous climate change.
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