红河断裂北段地球化学分段特征及其与地震活动性的关系

CHARACTERISTICS OF GEOCHEMICAL SEGMENTATION AND THEIR RELATION TO SEISMIC ACTIVITIES ALONG NORTHERN SECTION OF THE RED RIVER FAULT,YUNNAN PROVINCE

摘要:

红河断裂是我国境内主要的区域性活动断裂之一,根据地震地质特征,它被分为南北两段。本文引入一种新的分段法一地球化学分段法,依据断裂上温泉的密度、热储温度、循环深度和CO₂、HCO₃^-、SO₄^-、F、Li、Sr、B的含量等特征,把红河断裂北段进一步划分为四个亚段。笔者认为断裂带中的流体对断裂各亚段弱化程度的不同,是引起各个亚段地震活动性差异的主要原因。

Abstract:

The Red River fault is one of the major regional active faults in China,it had been divided into the southern and northern segments according to the features of seismogeology,A new segmentation method,geochemical segmentation method,is introduced in this paper. Based on the features of densities. reservoir temperatures,circulating depths and concentrations of CO₂,HCO₂^-,SO₄^- F,Li,Sr and B of the worm springs along the fault,the northern segment is further divided into four sub-segments,The seismic activities along these sub-segments of the fault differ from each other,which is thought to be mainly caused by the differences in weakness degree of each sub-segment due to the fluids in the fautl zone.