摘要
通过沃卡温泉出露特征、水化学及同位素组成调查,结合温泉发育的地质背景,研究沃卡温泉的水文地球化学特征和成因。研究表明沃卡温泉出露呈北东向带状展布,明显受断裂控制,温泉水化学类型为Cl·SO_4-Na和SO_4·HCO_3-Na型,阳离子成分为Na+为主,阴离子以Cl^-、SO_4^(2-),pH8.31~8.56,偏碱性,矿化度249.3~366.6mg/l,δD(‰)-150^-157.2,δ18O(‰)-18.3^-22,揭示温泉来源于大气降水补给,补给高程在5 000~5 300m之间。地球化学温标估算沃卡温泉热储温度155℃。泉类型主要为断裂深循环型,沃卡温泉热源主要为深循环地热增温。
The Voca hot springs arelocated in Tibet, and exposed in NE zonal distribution. Based on the field investigation and hydrogeochemitry stuty of the hot spring. The springs are controlled by fracture. The chemical types of the water are Cl · SO4 - Na and SO4 ·HCO3 -Na, The main cationic is Na＋ , anions are Cl ,SO2^4- , pH is a rang of 8.31～8.56, and the salinity is 249.3～366.6 mg/l; the water has the values of 3D-150～-157.2（%0）, and 8180-18.3 ～- 22 （%0）. The water of the hot springs was from the atmospheric precipitation and recharged at the elevation between 5 000～5 300 m. The calculated reservoir temperatures of VOCA hot spring is 155 ℃. The springs are the types of the deep circle along the fractures and heated by geothermal sources.
出处
《地质灾害与环境保护》
2016年第4期66-70,共5页
Journal of Geological Hazards and Environment Preservation
关键词
西藏沃卡
温泉
水化学
成因
Tibet Voca
Hot spring
Hydrochemistry
Formed Causes
