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以我国大陆范围内典型的岩浆热源型水热系统——云南腾冲热海为研究区,在国内首次对热泉中硫代砷化物含量及其地球化学成因进行了分析.研究采用的在野外对富硫化物水样进行快速冷冻处理、而后在实验室进行砷的形态分离和测试的方法明显优于当前通用的水样砷含量及其形态分析的预处理和测试方法.主要原因为后者在采样现场对水样的酸化处理可使样品中三硫代砷酸盐以非定形态硫砷化合物的形式沉淀,且用常规阴离子交换柱在野外无法实现硫代砷酸盐的完全回收及其与砷酸盐的分离.受岩浆流体输入和热储内高温条件下强烈流体-岩石相互作用的控制,热海水热系统排泄的中性-偏碱性热泉中富集硫化物和砷,为热泉中硫代砷化物的形成提供了必要条件.热海热泉中检出的硫代砷化物包括一硫代砷酸盐、二硫代砷酸盐和三硫代砷酸盐,在总砷中所占比例最高分别可达26.7%、43.3%和33.7%.热海地热田的2个子区(硫磺塘和澡塘河)的热泉沿不同断裂带出露,地热水升流过程中经历的冷却方式也不同,使硫磺塘热泉具有相对较高的总硫化物含量和总砷含量,并导致其中各类硫代砷酸盐具有更高的含量范围.
Taking the typical magmatic heat source hydrothermal system in China - Tengchong Atami, Yunnan Province as the research area, the content and geochemical origin of arsenic in hot springs were analyzed for the first time in China. Rapidly freezing treatment of sulfide-rich water samples followed by morphological separation and testing of arsenic in laboratories is clearly superior to the currently available methods for pretreatment and determination of arsenic levels in water samples and their morphological analysis, mainly due to the fact that the latter Acidification of the water samples at the sampling site allows the sample to precipitate thiosulfate in the form of non-defined sulfur-arsenic compounds, and the complete recovery of thiosolate with the conventional anion exchange column in the field can not be achieved The arsenate is separated by intense magmatic fluid-rock interaction under the input of magmatic fluids and high temperature in the thermal reservoir, and the sulphide and arsenic are enriched in the neutral-alkaline hot springs drained by the thermal seawater system, The formation of thio-arsenides in springs provides the necessary conditions for the detection of arsenic in hot-sea hot springs including monothionates, dithioarsenates and trithioarsenates, In the share The highest cases were up to 26.7%, 43.3% and 33.7%, respectively.The hot springs of the two sub-regions of Hothadi geothermal field (Sulfur Pool and Bath River) were exposed along different fault zones, and the cooling mode Also, sulfur pool hot springs have a relatively high total sulfide content and total arsenic content, and lead to a variety of thiosodium arsenate have a higher content range.