Journal ArticleOpen Access
Stable Strontium Isotopic Compositions of River Water, Groundwater and Sediments From the Ganges–Brahmaputra–Meghna River System in Bangladesh
Author Affiliations
Japan Agency for Marine-Earth Science and Technology, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, The University of Tokyo, ...
Published InFrontiers in Earth Science
Year2021
Citations20
Abstract
The Sr isotopic composition of rivers and groundwaters in the Bengal Plain is a major contributor to the global oceanic Sr inventory. The stable strontium isotope ratios (δ 88 Sr) provide a new tool to identify chemical weathering reactions in terrestrial water. In this study, we investigated the spatiotemporal variations of δ 88 Sr in samples of river water, bedload sediment, and groundwater collected from the Ganges–Brahmaputra–Meghna drainage basin in Bangladesh, which is known to strongly influence the 87 Sr/ 86 Sr ratio in seawater. The average δ 88 Sr values of waters of the Ganges, Brahmaputra, and Meghna rivers were 0.269, 0.316, and 0.278‰, respectively. Our data showed little difference between seasons of high and low discharge. The δ…
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