滇西实验场区主要活动断裂地球化学特征

本文论述了滇西实验场区五条主要活动断裂的地球化学特征,分析了活动断裂的地球化学特征与断裂的活动方式、活动强度和切割深度等构造因素之间的内在联系。提出洱源盆地西北部地壳内约5.4—6.2公里深度范围内发育有较大规模的热动力变质带,洱源地区高温温泉群的形成与这一变质带有关,其流体地球化学组分和同位素组成都具有热动力变质特征。红河断裂(北段)沿线温泉中含有较多的幔源挥发性组分,是典型的深循环增温型温泉

GEOCHEMICAL CHARACTERISTICS OF THE MAIN ACTIVE FAULTS IN WESTERN YUNNAN EARTHQUAKE PREDICTION TEST SITE

The author has studied the distribution of gebthermal water, discharges of the fault gases, isotopic compositions of the hot springs in Western Yunnan earthquake prediction test site. The relationship between the geochemical characteristics of the main active faults with the types, intensity and depth of faulting was discussed. The author suggests that larger dynamo-metamorphic belt has developed at a depth of about 5.4-6.2 km in the northwest of Eryuan County, and it was the result of the intersection of NW-and NE-trending tectonic belts. The hot springs in the area closely relate to this metamorphic belt. They are typical shear-heating type springs, characterized by strive thermo-dynamic-metamorphism. The hot springs along the Red River fault are of deep cycle-heating type ones, containing many components from the mantle.