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Freshwater plume-like condition near the north-eastern coastal Arabian Sea during early Miocene: Evidence from the stable isotope record in the growth bands of gastropods (Turritella sp.)
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Abstract
The Early Miocene witnessed major tectonic, palaeoceanographic and climatological
reorganizations over the Asian realm. The Himalayan and Tibetan plateau upliftment
influenced monsoon intensity during this age. Contemporary high-resolution tropical
hydroclimate records are limited. Here, we present an early Miocene sub-annual stable isotope record from the growth bands of well-preserved Turritella sp. from the Kachchh basin, Western India. It showed δ13C and δ18O variabilities from -4.83‰ to -1.80‰ and -7.06‰ to -2.66‰ (in VPDB) respectively. Conventional oxygen isotope thermometry showed an apparent temperature seasonality from 9.3° to 28.1°C. A comparison of the present early Miocene δ18O record with the modern δ18O records in the carbonates from coastal-estuarine environments of the Indian Ocean confirmed a high freshwater influx into the NE Arabian Sea during the early Miocene, similar to the modern-day freshwater plume events observed in the coastal region.
DOI
https://doi.org/10.31223/X5XX1G
Subjects
Climate, Earth Sciences, Geochemistry, Oceanography and Atmospheric Sciences and Meteorology
Keywords
Miocene, Stable isotopes, Monsoon, Arabian sea, freshwater, Upwelling, monsoon, stable isotopes
Dates
Published: 2024-01-30 14:12
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