Unraveling the paleo-marine signature in saline thermal waters of Cambay rift basin, Western India: Insights from geochemistry and multi isotopic (B, O and H) analysis.

Autor: Chatterjee S; Isotope and Radiation Application Division, Bhabha Atomic Research Centre, Mumbai 400085, India. Electronic address: sitangshujuchem@gmail.com., Mishra P; Geological Survey of India, Northern Region, Lucknow, India., Bhushan KS; Fuel chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India., Goswami P; Fuel chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India., Sinha UK; Isotope and Radiation Application Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2023 Jul; Vol. 192, pp. 115003. Date of Electronic Publication: 2023 May 11.
DOI: 10.1016/j.marpolbul.2023.115003
Abstrakt: Cambay rift basin is the only geothermal province in India that hosts several saline thermal water manifestations having EC values varying from 525 to 10,860 μS/cm. Various ionic ratios (Na/Cl, Br/Cl, Ca/(SO 4  + HCO 3 ), SO 4 /Cl) as well as boron isotopic composition (δ 11 B = 40.5 to 46 ‰) clearly ascribes the presence of fossil (relics of evaporated seawater) seawater as origin of increased salinity in the majority of thermal waters. Depleted isotopic (δ 18 O, δ 2 H) composition of these thermal waters also substantiates the presence of paleowater in these systems. In rest of the thermal waters, agricultural return flow is found to be source of dissolved solutes as confirmed from different bivariate plots such as B/Cl vs. Br/Cl and δ 11 B vs. B/Cl as well as from ionic ratios. This study thus provides the diagnostic tools to elucidate the source of variable salinity in the thermal waters circulating in the Cambay rift basin, India.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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