六盘山地区泉水地球化学特征

Abstract

Abstract: The origin and formation processes of the spring water from the fault zones in the Liupan Mountain and vicinity were discussed based on hydrochemical and isotopic data. We collected 10 water samples from springs and wells near the Liupan Mountain fault zones in November 2012 and July 2014. The attained hydrochemical data show that the TDS values ranged from 218 mg/L to 27508 mg/L, Values of δ¹⁸O and δD ranged from -12.02‰ to -8.47‰ and -88.5‰ to -61.33‰ respectively, which indicated that the spring waters in this area are mainly of meteoric origin and affected by the conditions of hydrological cycle and water-rock interaction. There are 10 hydrochemical types in the research areas based on the Schukalev hydrochemical classification method. Controlled by the aquifer lithology, the water samples in the sounthern area of Ningxia were mainly characterized by SO₄-Na type, while that in the northwest region of Weihe river were mainly characterized by HCO₃-Ca·Mg type. Ratios of ion concentrations between 2012 and 2014 indicated that Mg²⁺、 HCO^-₃♂、 F^- had obvious variations, maybe influenced by season. Underground waters in sampling point SWT、SG have significant interference by rainfall and surface water, while those of the sampling point WM、 QC 、 DYZ etc. have less interference because of the relatively closed aquifer. Ion milliequivalent ratio of XKH spring show the biggest variation and an opposite trend to the seasonal effection, which may indicate that this spring had more changes in water-rock reaction and are more susceptible to the variations of the chemical information from the internal fault. Through the sample data collected in different seasons, the hydrogeochemical background of Liupan Mountain was determined and the local control and influence factors of fluid geochemistry were analyzed in this paper. The results provide the fluid geochemical characteristics and are in favor of seismic monitoring and forecasting.

Key words: Spring water, Ion concentration, H and O isotopes, Hydrochemistry, Liupan Mountain

CLC Number:

P315.7

LI Jing,LI Ying,LU Li-na,SUN Feng-xia,XIE Chao,CUI Yue-ju. Geochemistry of Spring Water in the Liupan Mountain Area[J]. EARTHQUAKE, 2017, 37(1): 61-72.

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Geochemistry of Spring Water in the Liupan Mountain Area

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