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Chemical weathering and atmospheric carbon dioxide (CO2) consumption in Shanmuganadhi, South India: evidences from groundwater geochemistry

Vinnarasi, F and Srinivasamoorthy, K and Saravanan, K and Gopinath, S and Prakash, R and Ponnumani, G and Babu, C (2021) Chemical weathering and atmospheric carbon dioxide (CO2) consumption in Shanmuganadhi, South India: evidences from groundwater geochemistry. In: Environmental Geochemistry and Health, 43 (2). pp. 771-790.

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Official URL: https://doi.org/10.1007/s10653-020-00540-3

Abstract

Chemical weathering in a groundwater basin is a key to understanding global climate change for a long-term scale due to its association with carbon sequestration. The present study aims to characterize and to quantify silicate weathering rate (SWR), carbon dioxide consumption rate and carbonate weathering rate (CWR) in hard rock terrain aided by major ion chemistry. The proposed study area Shanmuganadhi is marked with superior rainfall, oscillating temperature and runoff with litho-units encompassing charnockite and hornblende–biotite gneiss. Groundwater samples (n = 60) were collected from diverse locations and analysed for major chemical constituents. Groundwater geochemistry seems to be influenced by geochemical reactions combining dissolution and precipitation of solids, cation exchange and adsorption along with minor contribution from anthropogenic activities. The SWR calculated for charnockite and hornblende–biotite gneiss was 3.07 tons km−2 year−1 and 5.12 tons km−2 year−1, respectively. The calculated CWR of charnockite and hornblende–biotite gneiss was 0.079 tons km−2 year−1 and 0.74 tons km−2 year−1, respectively. The calculated CO2 consumption rates via silicate weathering were 1.4 × 103 mol km−2 year−1 for charnockite and 5.8 × 103 mol km−2 year−1 for hornblende–biotite gneiss. Lithology, climate and relief were the key factors isolated to control weathering and CO2 consumption rates. © 2020, Springer Nature B.V.

Item Type: Journal Article
Publication: Environmental Geochemistry and Health
Publisher: Springer Science and Business Media B.V.
Additional Information: The copyright for this article belongs to Springer Science and Business Media B.V.
Keywords: carbon dioxide; carbon sequestration; chemical weathering; consumption behavior; groundwater chemistry; groundwater pollution; ion exchange; silicate; temperature effect, carbon dioxide; carbonic acid; ground water; silicate, carbon sequestration; chemistry; climate; environmental monitoring; geology; India; water pollutant, Carbon Dioxide; Carbon Sequestration; Carbonates; Climate; Environmental Monitoring; Geology; Groundwater; India; Silicates; Water Pollutants, Chemical
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 20 Feb 2023 11:26
Last Modified: 20 Feb 2023 11:26
URI: https://eprints.iisc.ac.in/id/eprint/80431

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