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.)

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Terra Nova Pub Date : 2024-05-08 DOI:10.1111/ter.12719

Yogaraj Banerjee, Prosenjit Ghosh

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引用次数: 0

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.

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中新世早期阿拉伯海东北海岸附近的淡水羽状状态：腹足类（Turritella sp.）生长带的稳定同位素记录证据

早中新世见证了亚洲地区重大的构造、古海洋学和气候学重组。喜马拉雅山和青藏高原的隆起影响了这一时期的季风强度。当代高分辨率的热带水文气候记录十分有限。在此，我们从印度西部卡奇盆地保存完好的Turritella sp.的生长带中获得了早中新世次年稳定同位素记录。其δ13C和δ18O的变化率分别为-4.83‰至-1.80‰和-7.06‰至-2.66‰（以VPDB计）。传统的氧同位素温度测定法显示温度季节性明显，从 9.3°到 28.1°C。将目前的早中新世δ18O 记录与印度洋沿岸-河口环境碳酸盐岩中的现代δ18O 记录进行比较，证实早中新世期间有大量淡水流入阿拉伯海东北部，这与在沿岸地区观测到的现代淡水羽流事件类似。

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来源期刊

Terra Nova 地学-地球科学综合

CiteScore

4.80

自引率

8.30%

发文量

审稿时长

2.3 months

期刊介绍： Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.