Isotopes of deuterium and oxygen-18 in thermal groundwater in China |
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| Authors: | Zhou Xun Fang Bin Zhou Haiyan Li Juan Wang Ying |
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| Institution: | (1) School of Water Resources and Environment, China University of Geosciences, Xueyuan Road 29, Beijing, 100083, People’s Republic of China |
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| Abstract: | Compositions of deuterium and 18O isotopes of 90 representative samples indicate that thermal groundwater in most parts of China is meteoric in origin. Latitude,
altitude, and continent effects have significant bearing on the values of δD and δ18O of the hot water samples. Oxygen-18 shift is not significant in most of the thermal groundwater, especially the hot water
of low-to-moderate temperature. Slight oxygen-18 shift is only found in some hot springs of high temperature in Tibet and
western Yunnan and in thermal groundwater of low-to-moderate temperature in the deep-seated carbonate aquifers in the northern
North China Plain (including the Tianjin area). Near-surface boiling may causes the shift of the former and the latter may
be attributed to exchange of oxygen-18 between water and carbonates in the geothermal systems of taphrogenic basin-type. Hot
springs in Tibet and western Sichuan have very low contents of δD and δ18O, possibly due to recharge of precipitation and snow-melting water of extremely depleted δD and δ18O values at high latitudes of several thousands of meters. |
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| Keywords: | Deuterium and oxygen-18 Isotope Meteoric water Thermal groundwater Hot spring China |
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