Geochemical investigation of groundwater in a Granitic Island: a case study from Kinmen Island,Taiwan |
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Authors: | Tai-Sheng Liou Hsueh-Yu Lu Cheng-Kuo Lin Wayne Lin Yu-Te Chang Jeng-Ming Chien Wen-Fu Chen |
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Institution: | (1) Department of Earth and Environmental Sciences, National Chung Cheng University, 168, University Rd., Min-Hsiung, Chia-Yi, Taiwan;(2) Resource Technology Division, Energy and Environmental Research Laboratories, Industrial Technology Research Institute, Hsin-Chu, Taiwan;(3) Department of Tourism Management, Chia Nan University of Pharmacy and Science, Tai-nan, Taiwan; |
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Abstract: | Kinmen Island is principally composed of low permeable granitoid and covered by a very thin sedimentary layer. Both surface
and groundwater resources are limited and water demand is increasing with time. The groundwater in the granitoid has been
surveyed as an alternative water source for daily use. Two to five highly fractured zones in the granitoid aquifer for each
site were first determined by geochemical well logging. Accordingly, ten samples were collected from three sites. Using environmental
isotopes and geochemical modeling, geochemical processes occurring due to water–rock interaction in the granitoid aquifer
can be quantitatively interpreted. The stable isotopes of oxygen and hydrogen in groundwaters cluster along Taiwan’s local
meteoric waterline, indicating evaporation does not have considerable effect on groundwaters. Given such a high evaporation
rate for Kinmen Island, this result implies that infiltration rate of groundwater is high enough to reduce retention time
through a well-developed fracture zone. NetpathXL is employed for inverse geochemical modeling. Results determine gypsum as
being the major source of sulfate for deep groundwaters. The contribution from pyrite is minor. In addition, the weathering
of albite to kaolinite is the dominant water–rock interaction characterizing geochemical compositions of deep groundwater
in Kinmen Island. |
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