Geochemistry of modern shells of the gastropod Radix in the Tibetan Plateau and its implications for palaeoenvironmental reconstruction

Chen, Feng; Feng, Jing-Chun; Ban, Fengmei; Cai, Bofeng; Hu, Hai-Ping; Pei, Le-Le; Wang, Kun-Ying; Gao, Shaopeng; Zhang, Jifeng

doi:10.1016/j.quascirev.2020.106703

Cited by 4 publications

(1 citation statement)

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“…Chen et al (2016) provided the fractionation factor between δ 18 O shell-avg and δ 18 O water varying from 1.031 to 1.034, which is close to the calculated results for the aragonite–water system (Zheng, 1999). To calculate the growth temperature from the δ 18 Ο shells and δ 18 O ambient water , we used the isotopic equilibrium equation (equation (1)) for aragonite mollusc shells (Chen et al, 2021; Grossman and Ku, 1986):…”

Section: Quantification Of Hydrogeochemistrymentioning

confidence: 99%

Late-Holocene hydrological variability from the NW Himalaya and southwestern Tibetan Plateau: Paleo-salinity records from Pangong Tso

et al. 2023

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Variations in lake-levels and hydrology are connected to climatic dynamics over the Trans-Himalaya and Tibetan Plateau (TP). Pangong Tso, a ~140 km long hypersaline lake, is sensitive to changes in air temperature, precipitation and snow-glacier melt over the southwestern TP. The incised tributaries entering the lake expose deltaic sequences constituting topset, foreset and bottomset. Sedimentology, chronology and diatom analysis of delta sediments; and stable isotopic and sclerochronological analysis of gastropods helped delineate the Late-Holocene variation in lake levels, surface temperature and salinity. The elevation of the topsets is considered as representing past lake high-stands from where molluscs were also recovered. Three phased lake level changes are observed during the past 3 ka. The first high-stand (+1.4–3.0 m) was at ~2.8–2.0 ka when lake surface salinity and temperature were 4.67–6.01 ppt (parts per thousand) and 5°C–7°C, respectively, against the modern average values of 7.7 ± 0.09 ppt and 16.1°C ± 2.0°C. Followed by a brief decline, another high-stand (+3.0–3.6 m) is observed at 1.1 ka when the salinity is reduced to 4.03–5.72 ppt and lake surface temperature to 5°C–8°C. A corresponding increase in freshwater diatom concentration is also observed here. The third phase over the past 1 ka witnessed a fall of ~3.6–6 m in lake level that is attributed to an abrupt rise in aridity over the TP. We demonstrate that lake level variation in the region is a function of the variability of the Indian Summer Monsoon (ISM) and the westerlies, however during the high-stand, the hydrology of the lake was dominated by ISM precipitation.

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