博茨瓦纳Sua盐湖地下卤水来源及成因

单慧媚; 马腾; 谭婷; 罗朝晖; 祁志冲; 翟明哲; LekgoweOteng M.

doi:10.3799/dqkx.2013.061

Volume 38 Issue 3

May 2013

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Article Navigation > Earth Science > 2013 > 38(3): 607-615

SHAN Hui-mei, MA Teng, TAN Ting, LUO Zhao-hui, QI Zhi-chong, ZHAI Ming-zhe, Lekgowe Oteng M., 2013. Sources and Genesis of Subsurface Brine in Sua Pan, Botswana. Earth Science, 38(3): 607-615. doi: 10.3799/dqkx.2013.061

Citation:

SHAN Hui-mei, MA Teng, TAN Ting, LUO Zhao-hui, QI Zhi-chong, ZHAI Ming-zhe, Lekgowe Oteng M., 2013. Sources and Genesis of Subsurface Brine in Sua Pan, Botswana. Earth Science, 38(3): 607-615. doi: 10.3799/dqkx.2013.061

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Sources and Genesis of Subsurface Brine in Sua Pan, Botswana

doi: 10.3799/dqkx.2013.061

SHAN Hui-mei^{1, 2
,},
MA Teng^{1, 2
,
,},
TAN Ting^{1, 2},
LUO Zhao-hui^{1, 2},
QI Zhi-chong^{1, 2},
ZHAI Ming-zhe³,
Lekgowe Oteng M.⁴

1.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
2.
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
3.
Department of Geology, University of Botswana, Gaborone 0022, Botswana
4.
Department of Geological Survey, Government of Botswana, Gaborone 0014, Botswana

Received Date: 2012-05-21
Publish Date: 2013-05-15

Abstract

Abstract

The salt lake of Sua Pan, one of the largest salt lakes in Botswana, is important resources of natural alkali. To identify the sources and genesis of subsurface brine in this salt lake, groundwater and surface water near this lake, in addition to subsurface brine water in the lake and salt crystals from solar salt field were collected and determined. The contents of major cation and anion, the isotope compositions of D, ¹⁸O and ³⁷Cl, and the ¹⁴C age of groundwater were calculated. It is found that the subsurface brine is characterized by enriched Na and K, and depleted Ca and Mg. Results of D, ¹⁸O and ³⁷Cl show that surface water is closely connected with subsurface brine in Sua Pan, while the role of groundwater recharge on it is weak (the difference of ³⁷Cl is 0.04‰-0.06‰). Relationships of TDS-γ_Na/γ_Cl indicate that leaching of halite affects the formation of this subsurface brine (γ_Na/γ_Cl≈1), and the age of ¹⁴C (about 20 000 years ago)indicates that the fluctuation of ancient climate is considered to be an important factor of the formation of Sua Pan. Based on the above knowledge, inverse simulation of subsurface brine in Sua Pan is modeled by PHREEQC software, which further verifies that salt lake of Sua Pan is mainly the result of strong evaporation and concentration of surface water and halite leaching by groundwater.
- subsurface brine,
- hydrogeochemical characteristics,
- isotopes,
- inverse simulation,
- geochemistry

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