张掖盆地龙首山山前高氟地下水的形成

摘要/Abstract

摘要：

氟是人体的必须元素之一,饮水中氟元素过量会导致地氟病。高氟地下水的形成机制一直是水文地球化学研究的一个热门话题。利用在张掖盆地开展1∶5万水文地质调查所获得的大量水位、水质资料,运用水化学和氘氧同位素方法,在较高精度水平上探讨了龙首山前高氟地下水的形成机制。研究结果表明,龙首山前地下水中的F^-主要来源于龙首山含氟岩石,通过季节性洪水的方式补给到盆地的第四系含水层中,并与盆地上游来源的低氟地下水发生混合,使龙首山前地下水分为三个条带。

关键词: 张掖盆地, 水文地质调查, 高氟地下水, 形成机制, 溶滤作用

Abstract:

Fluorine is one of essential elements of the human body, but excessive F can be harmful to human body. The formation mechanism of high fluorine groundwater has been a hot topic of hydrogeochemical research. The authors analyzed numerous groundwater level and quality data from 1∶50,000 hydrogeological survey in Zhangye Basin. By using hydrogeochemical and oxygen deuterium isotope methods, the authors discussed the formation mechanism of high-fluorine groundwater in Longshoushan piedmont in a high accuracy level. The results show that high-fluorine groundwater mainly origins from Longshoushan mountain fluorine-bearing rock. The high-fluorine surface water in Longshoushan mountain recharge into Quaternary aquifer in Zhangye Basin through seasonal floods and mixes with low-fluorine groundwater from upstream. Different recharge sources divided groundwater into three strips in Longshoushan piedmont.

Key words: Zhangye Basin, hydrogeological survey, high-fluoride groundwater, formation mechanism, leaching

中图分类号:

P314.1

王文祥, 何锦, 张梦南, 安永会, 李文鹏, 吴玺, 龚磊, 王晓燕. 张掖盆地龙首山山前高氟地下水的形成[J]. 现代地质, 2017, 31(02): 415-420.

WANG Wenxiang, HE Jin, ZHANG Mengnan, AN Yonghui, LI Wenpeng, WU Xi, GONG Lei, WANG Xiaoyan. High-fluorine Groundwater Formation in Longshoushan Piedmont in Zhangye Basin[J]. Geoscience, 2017, 31(02): 415-420.

图/表 7

参考文献 19

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样品编号	距离/km	F^-/(mg/L)	TDS/(mg/L)
ZY545	0.0	0.1	1 029.0
ZY295	7.6	0.1	335.9
ST087	42.4	0.1	558.8
ZY289	11.1	0.1	394.2
ST083	45.5	0.1	344.8
ST095	39.7	0.2	1 207.0
ZY557	5.6	0.2	325.2
ZY99	3.8	0.2	617.2
SS177	35.9	0.2	360.6
ZY110	11.5	0.2	1 533.0
ZY94	6.1	0.3	2 010.0
ZY556	9.6	0.3	403.2
SF054	27.1	0.4	1 742.0
ZY108	8.2	0.5	501.8
SF051	24.7	0.8	1 460.0
何38	18.3	0.8	729.6
ZY114	2.2	0.9	928.6
SF066	31.6	1.0	1 165.0
SF028	28.5	1.2	1 064.0
ZY112	14.3	1.3	850.8
SF029	27.6	1.7	1 202.0
何37	22.9	1.7	718.9
ZY334	15.1	2.0	913.5
何32	20.1	2.0	975.3

样品编号	距离/km	F^-/(mg/L)	TDS/(mg/L)
ZY545	0.0	0.1	1 029.0
ZY295	7.6	0.1	335.9
ST087	42.4	0.1	558.8
ZY289	11.1	0.1	394.2
ST083	45.5	0.1	344.8
ST095	39.7	0.2	1 207.0
ZY557	5.6	0.2	325.2
ZY99	3.8	0.2	617.2
SS177	35.9	0.2	360.6
ZY110	11.5	0.2	1 533.0
ZY94	6.1	0.3	2 010.0
ZY556	9.6	0.3	403.2
SF054	27.1	0.4	1 742.0
ZY108	8.2	0.5	501.8
SF051	24.7	0.8	1 460.0
何38	18.3	0.8	729.6
ZY114	2.2	0.9	928.6
SF066	31.6	1.0	1 165.0
SF028	28.5	1.2	1 064.0
ZY112	14.3	1.3	850.8
SF029	27.6	1.7	1 202.0
何37	22.9	1.7	718.9
ZY334	15.1	2.0	913.5
何32	20.1	2.0	975.3

	Ca²⁺	Cl^-	TDS	F^-
Ca²⁺	1.00
Cl^-	0.69	1.00
TDS	0.83	0.86	1.00
F^-	-0.03	0.21	0.18	1.00

	Ca²⁺	Cl^-	TDS	F^-
Ca²⁺	1.00
Cl^-	0.69	1.00
TDS	0.83	0.86	1.00
F^-	-0.03	0.21	0.18	1.00

样品编号	井深/m	δ¹⁸O/‰	δD/‰	F^-/(mg/L)
何34	80	-11.4	-81.7	3.1
何37	150	-10.8	-79.5	1.7
何39	180	-10.2	-72.0	1.5
何35	85	-9.6	-69.8	1.8
SF049	100	-9.4	-60.5	0.8
何24	120	-9.4	-63.4	0.4
SF051	100	-9.3	-63.8	0.8
何27	130	-9.3	-60.5	0.4
SF050	100	-9.3	-60.3	0.7
何11	10	-9.3	-59.9	0.6
何30	150	-9.2	-56.4	0.3
何33	20	-9.1	-68.1	1.5
何32	14	-8.6	-66.3	2.0
何23	110	-8.6	-57.8	0.4
SF061	100	-8.6	-53.4	0.2
何28	140	-8.5	-56.3	0.4
SF027	120	-8.5	-52.8	0.2
SF029	100	-8.3	-53.7	1.7
SF076	120	-8.2	-49.6	0.2
SF059	100	-8.1	-49.2	0.2
何13	10	-7.7	-58.2	0.5