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- W4380792365 endingPage "121599" @default.
- W4380792365 startingPage "121599" @default.
- W4380792365 abstract "Despite several attempts, the effects of volcanism and greenhouse gas emission on climate (e.g., rainfall) over India across the Cretaceous/Palaeogene Boundary (66.1 ± 0.01 Ma) remain a contentious issue. Inferences from conventional isotopic, palaeosol, floral analysis, and palaeoclimate models are contradictory ranging from much lower- to higher-than-today rainfall during this high CO2 atmosphere. To resolve this, robust tracer of triple oxygen isotopic ratios (ẟ18O-∆′17O) of silicified fossil woods from Deccan intertrappean lacustrine sediments, central India were analysed for retrieving the silicification temperature and ambient fluid (water) isotopic composition. Under certain assumptions and uncertainty, triple oxygen isotope data indicate that the fluids were derived from a mixture of meteoric and hydrothermal water. The meteoric water end member possibly had a low ẟ18OVSMOW value (∼− 12 ± 2‰) compared to the modern mean monsoon rainwater (∼− 5‰) which implies a substantially higher rainfall than today (∼1760 ± 200 to 1860 ± 200 mm/year) in the terminal Cretaceous India. This result supports the prediction of elevated precipitation by the recent new generation of global coupled models that consider various feedbacks and ocean dynamics, at a high CO2 atmosphere. It is also consistent with the paleo-botanical evidence but far exceeds the amount predicted by the older paleoclimate models pertaining to the Cretaceous period." @default.
- W4380792365 created "2023-06-16" @default.
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- W4380792365 date "2023-09-01" @default.
- W4380792365 modified "2023-10-18" @default.
- W4380792365 title "Triple oxygen isotopes in intertrappean fossil woods: Evidence of higher tropical rainfall during Deccan volcanism" @default.
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- W4380792365 doi "https://doi.org/10.1016/j.chemgeo.2023.121599" @default.
- W4380792365 hasPublicationYear "2023" @default.
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