Geochemical Constraints on the Origin and Evolution of Spring Waters in the Changdu‐Lanping‐Simao Basin, Southwestern China

• Published in: Acta geologica Sinica (Beijing) Vol. 93; no. 4; pp. 1097 - 1112
• Main Authors: QIN, Xiwei, MA, Haizhou, ZHANG, Xiying, CHENG, Huaide, HAN, Jibin, LI, Yongshou, MIAO, Weiliang, HAI, Qingyu
• Format: Journal Article
• Language: English
• Published: Richmond Wiley Subscription Services, Inc 01.08.2019; University of Chinese Academy of Sciences, 100049 Beijing, China%Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt lakes, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 810008 Xining, China; Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Qinghai Institute of Salt Lakes, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 810008 Xining, China; Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt lakes, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 810008 Xining, China; Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Qinghai Institute of Salt Lakes, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 810008 Xining, China%Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt lakes, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 810008 Xining, China; School of Environmental Studies, China University of Geosciences, 430074 Wuhan, China
• Edition: English ed.
• Subjects: Basins; Boron; Brines; Carbonate minerals; Carbonates; Changdu‐Lanping‐Simao Basin; Fluids; Geochemistry; Halite; Halites; Isotopes; Leaching; Meteoric water; Minerals; Organic chemistry; Ratios; Rocks; Saline water; Saturation; Seawater; Solutes; spring water origin; Sulphates; Terrestrial environments; Water springs; δ11B; δ18O; China; δD; δ11B; Boron; Changdu-Lanping-Simao Basin; δ18O; spring water origin
• ISSN: 1000-9515; 1755-6724
• DOI: 10.1111/1755-6724.13853

Chemical and isotopic data were measured for 51 leached brine springs in the Changdu‐Lanping‐Simao Basin (CD‐LP‐SM), China. The predominance of Cl and Na, saturation indices of carbonate minerals, and Na/Cl and Ca/SO4 ratios of ∼1 suggest that halite, sulphate, and carbonate are the solute sources. Integration of geochemical, δ18O, and δD values suggests that springs are mainly derived from meteoric water, ice‐snow melt, and water‐rock interactions. B concentrations range from 0.18 to 11.9 mg/L, with δ11B values of –4.37‰ to +32.39‰, indicating a terrestrial source. The δ11B‐B relationships suggest B sources of crustal origin (marine carbonates with minor crust‐derived volcanics); we did not identify a marine or deep mantle origin. The δ11B values of saline springs (+4.61‰ to +32.39‰) exceed those of hot (–4.37‰ to +4.53‰) and cold (–3.47‰ to +14.84‰) springs; this has contributed to strong water‐rock interactions and strong saturation of dissolved carbonates. Conversely, the global geothermal δ11B‐Cl/B relationship suggests mixing of marine and non‐marine sources. The δ11B‐Cl/B relationships of the CD‐LP‐SM are similar to those of the Tibet geothermal belt and the Nangqen Basin, indicating the same B origin. These differ from thermal waters controlled by magmatic fluids and seawater, suggesting that B in CD‐LP‐SM springs has a crustal origin.