新疆天然水化学特征区域分异及其地质成因

为研究新疆天然水化学特征区域分异及成因,采集、分析和田地区51组天然水样,收集已发表的新疆其它地区天然水化学数据103组。数据说明：南疆天然水总溶解性固体（TDS)（1 589.4 mg/L）是北疆天然水（513.5 mg/L）的3.1倍;83.33%和89.59%的北疆天然水TDS和TH符合中国饮用水卫生标准,南疆天然水TDS和TH达标率分别为62.26%和70.75%。北疆天然水水化学类型主要为Ca-HCO₃和Ca·Mg-HCO₃·SO₄,南疆天然水水化学类型主要为Na·Ca-Cl·SO₄和Na·Mg-Cl·SO₄。南北疆天然水化学特征区域差异与南北疆地质构造分区重合。地质构造演化的不同,为南北疆天然水提供不同物源;水文气象差异加剧了其天然水化学组分差异。

Regional Differences and Geological Causes of Hydrochemistry of Natural Water in Xinjiang,China

To study the regional differences of hydrochemistry of natural water in Xinjiang, 51 natural water samples from Hotan Prefecture, Xinjiang were collected and analyzed. 103 sets of data on natural hydrochemistry in other parts of Xinjiang were collected from published papers. The results showed that: total dissolved solid (TDS) in natural water from Southern Xinjiang(1 589.4 mg/L) was 3.1 times as high as that of Northern Xinjiang(513.5 mg/L). TDS and TH in 83.33% and 89.59%, respectively, of natural water samples from Northern Xinjiang were to the standards for drinking water quality, while the figures for natural water samples from South Xinjiang were 62.26% and 70.75% respectively. The water type in North Xinjiang were Ca-HCO₃ and Ca·Mg-HCO₃·SO₄ mainly,while the water type in South Xinjiang were Na·Ca-Cl·SO₄ and Na·Mg-Cl·SO₄. The mean/average concentration of nitrate ion(NO₃^-) in natural water from North Xinjiang(5.2 mg/L) was higher than that of South Xinjiang(2.7 mg/L). Main conclusions: The significant regional differences of hydrochemistry between North Xinjiang and South Xinjiang coincided with tectonic division in Xinjiang. Regional differences of hydrochemistry of natural water in Xinjiang resulted from the interaction of geological factor, hydrometeorologic factor and human activities. Chemical constituents of natural water from Xinjiang were mainly determined by rock weathering and evaporation concentration. Chemical constituents of natural water from North Xinjiang were mainly from carbonatite and evaporite weathering. And chemical constituents of natural water from South Xinjiang were mainly from carbonatite, silicate minerals and evaporite weathering. The evolution of chemical constituents of natural water in North Xinjiang was less affected by evaporation concentration than that in South Xinjiang. In addition, NO₃^- concentration in natural water from Xinjiang was high, indicating that human activities also had an impact on the regional differences of hydrochemistry to some extent.