Study on Formation Mechanism of High-Fluoride Groundwater in Guide Basin

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Abstract:

As high-fluoride poisoning is widespread in Guide Basin, formation mechanism study is of significance for local water quality improvement. Through analysis of regional geology, tectonics and petrography, the provenances are confirmed that metamorphic rocks from Archean to Lower Proterozoic periods are the original provenance of fluorine and the Miocene - Pliocene Guide Group stratum of fine lake sediments, which is rich in organic matter, is the secondary provenance. Moreover, confined groundwater occurring in the Guide Group stratum, which has a fluoride content of 0.32~4.57mg/L, is the main groundwater of high fluoride in the study area. The distribution of confined groundwater obviously controlled by the compression-tortion fault with NNW striking and tension-shear fault with NEE striking forms two abnormal centers. The anomaly area spreads around the NEE shear and forms an ellipse shape, which has a north-south width of 5km and a east-west length of approximately 10km. In further study, the distribution characteristics of high-fluoride groundwater in the plane is discovered generally to be consistent with the distribution of groundwater, and has a positive correlation with depth and temperature of boreholes. This phenomenon indicates that the high-fluoride groundwater is likely controlled by the geothermal anomaly, and the geological effects of thermal dynamics may play an important role in the control of fluorine in enrichment, migration and transformation.

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Advanced Materials Research (Volumes 550-553)

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2515-2520

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July 2012

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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