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Mixing geochemistry of cold water around non-volcanic thermal springs in high-grade metamorphic terrain, Sri Lanka

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dc.contributor.author Jayawardana, D.T.
dc.contributor.author Udagedara, D.T.
dc.contributor.author Silva, A.A.M.P.
dc.contributor.author Pitawala, H.M.T.G.A.
dc.contributor.author Jayathilaka, W.K.P.
dc.contributor.author Adikaram, A.M.N.M.
dc.date.accessioned 2017-10-27T03:42:22Z
dc.date.available 2017-10-27T03:42:22Z
dc.date.issued 2016
dc.identifier.citation Jayawardana, D.T., Udagedara, D.T., Silva, A.A.M.P., Pitawala, H.M.T.G.A., Jayathilaka, W.K.P., Adikaram, A.M.N.M. (2016). "Mixing geochemistry of cold water around non-volcanic thermal springs in high-grade metamorphic terrain, Sri Lanka", Chemie der Erde, pp. 01-11 en_US, si_LK
dc.identifier.uri http://dr.lib.sjp.ac.lk/handle/123456789/6201
dc.description.abstract Attached en_US, si_LK
dc.description.abstract A geochemical survey was conducted on thermal water and cold water around non-volcanic geothermal fields at Mahaoya and Marangala in Sri Lanka. One hundred forty-two samples were analyzed for fifteen selected irons to investigate geochemical relationships resulting from water-rock interactions and mixing. Based on measurements using a Na-K-Mg geothermometer, the maximum temperatures of thermal reservoirs were estimated to be 148 °C in Mahaoya and 191 °C in Marangala, which were higher values than those obtained using Na-Li and Li-Mg geothermometers. This suggests that the reservoirs extend from intermediate to deep levels. Hydrogeochemistry of thermal waters is distinct from that of cold water; higher contents of Na, K, Cl, F, S04 and TDS in thermal water are most likely due to the dissolution of feldspar, mica, and sulfide minerals in the granitic rocks. Conversely, lower values of Fe, Mg, Cu, Zn, and Pb imply less ferromagnesian minerals in the basement. Classification based on major ions reveals a Na-K-S04 type of thermal water for Mahaoya and Marangala. Cold water is dominated by the Na-K-HC03 type, which indicates deep groundwater influence by iron exchange. Non-mixing cold water indicates a Ca-HCCh type. In general, chemistry of cold water wells (<400 m) close to the thermal water changes significantly due to direct mixing of thermal water and cold water. In comparison, a contrasting action occurs with increasing distance from the geothermal field. Gradual decline of S04 with increasing distance from thermal water may indicate a trend of dear oxidation. However, the chemistry of more distant wells demarcates deep circulations through fractures and faults in the basement
dc.language.iso en_US en_US, si_LK
dc.publisher Chemie der Erde en_US, si_LK
dc.subject Thermal water en_US, si_LK
dc.subject Cold water en_US, si_LK
dc.subject Geochemistry en_US, si_LK
dc.subject Geothermometer en_US, si_LK
dc.subject Mixing en_US, si_LK
dc.title Mixing geochemistry of cold water around non-volcanic thermal springs in high-grade metamorphic terrain, Sri Lanka en_US, si_LK
dc.type Article en_US, si_LK


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