深圳市东湖矿泉水形成机理探讨

深圳市东湖矿泉水是自然界十分稀少的锶—锌—偏硅酸碳酸复合型矿泉水，通过对矿泉水赋存地的地质与水文地质条件的分析，并结合其水文地球化学特征，认为东湖矿泉水形成的主要控制性因素是构造作用和变质作用；在特定的水文地质条件下，深部碳酸盐类岩石受热硅化变质而产生大量CO2气体，使得各种化学元素在含有大量CO2的地下水的溶滤作用下不断迁移和富集而形成该区地下水中良好的元素组合。在其特征成分中，偏硅酸来自裂隙渗透水的溶滤和岩浆期后热液水的作用，微量元素锶主要来源于钾长石、钙长石，锌则主要来自岩浆活动以及岩脉中的黑云母、角闪石、辉石等铁镁硅酸盐矿物；并认为目前矿泉水含水层仍处于良好的地质环境保护下。

MECHANISM OF FORM DISCUSSION OF DONGHU MINERAL WATER IN SHENZHEN CITY

According to its special chemical constituents,Donghu mineral water in Shenzhen City is termed as Sr-Zn-H_2SiO_3-CO_2 mineral water, rarely found in nature.Faults and metamorphism in this area are determined as main controlling factors for the forming of this special mineral water on the basis of comprehensive analysis of the geological environment,hydrogeological conditions, and its hydrogeochemistry.The special constituents of the groundwater originate from rocks through which it flows during geological processes,while CO_2 is derived from the metamorphism of carbonate rocks in depth.Furthermore, the groundwater high in CO_2 causes other elements to be dissolved from rocks and to be accumulated in the water.This study shows that the soluble silicon of mineral water mainly comes from quartz dissolution caused by the thermal water after active magmatic period,Sr from orthoclase and anorthite,and Zn from magma solution and other ferric magnesium silicate minerals,for example,biotite,hornblende and picrite.Now,the aquifer of the mineral water is well protected in its relatively closed geological environment.