NDLI: Hydrochemistry of hot springs in geothermal fields of central, northern, and northeastern Taiwan: implication on occurrence and enrichment of arsenic

Content Provider	Springer Nature Link
Author	Jean, Jiin Shuh Liao, Libing Kar, Sandeep Liu, Chia Chuan Li, Zhaohui
Copyright Year	2016
Abstract	Elevated arsenic (As) levels in geothermal systems have been identified in many places of the world. In this study, hydrochemical features and occurrence of As in hot springs from three geothermal fields located in northern, northeastern (NE), and central Taiwan were characterized. The results showed remarkable differences in pH and dissolved ions among these springs, due to their strong association with different geological origins. The acidic springs in the north field were associated with igneous rocks and were of Na–Ca–SO$_{4}$ type, whereas neutral-alkaline springs in the NE and central fields were distributed in sedimentary and metamorphic rocks and were of Na-HCO$_{3}$ and Na–Ca–HCO$_{3}$ types. Geochemical modeling suggests that ionic variation is redox-sensitive, interrelated, and consistent with mineral saturation. Dissolution of carbonate minerals in sedimentary and metamorphic rocks would result in enrichment of HCO$_{3}$ $^{−}$, whereas oxidation of sulfur minerals associated with igneous rocks might be responsible for the low pH and elevated sulfate concentrations. Stable isotope signatures showed depletion of δD values in hot springs associated sedimentary and metamorphic rocks compared to those from igneous rocks. This suggested their mixing with local meteoric water or salt water, and their chemical compositions were influenced by water–rock interaction. Aqueous As concentrations were less than 100 µg/L in most springs except the one in the north field, where it peaked at 3867 µg/L. The elevated As level was presumably source-dependent and the presence of As-bearing pyrite in acidic-sulfate spring might be responsible for the geochemical anomaly of high As.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	19
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-10-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arsenic occurrence and enrichment Dissolution Water–rock interaction Hydrogeochemistry Hot Spring Taiwan Stable isotopes Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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