腾冲热海火山地热区近期水热爆炸的阶段性演化特征  

Evolutionary Characteristics of Recent Hydrothermal Explosions in the Tengchong Rehai Volcanic Geothermal Region

作　　者：上官志冠[1] 赵慈平[2] 李恒忠 高清武[1] 孙明良[4] 

机构地区：[1]中国地震局地质研究所,北京100029 [2]云南省地震局,昆明650041 [3]云南腾冲县地震局,云南腾冲679100 [4]中国科学院兰州地质研究所,兰州730000

出　　处：《矿物岩石地球化学通报》2004年第2期124-128,共5页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：科技部社会公益研究专项基金资助项目(2001DIA10003)

摘　　要：水热爆炸是活动性地热田的典型显示。腾冲热海火山地热区历史上曾发生过强烈的水热爆炸活动,但前期一度沉寂。1993年以来水热爆炸活动再度活跃。在过去十年间,研究区内发生过较大的爆炸喷发事件20余次,且规模越来越大。本文根据对爆炸形成泉点的逸出气体化学和氦同位素组成的测试结果,研究了区内近期水热爆炸活动的演化特征。逸出气体化学和氦同位素组成特征指示,区内近期引发水热爆炸活动的气体源区有从浅层、中层向深层发展的趋势;作者认为,区内未来可能发生更大规模的爆炸活动,其危险性应引起高度关注。Hydrothermal explosions are a typical manifestation of active geothermal fields. Violent hydrothermal explosions had occurred in the Tengchong Rehai volcanic geothermal region in history.After quietness for a period of time,the hydrothermal explosions in the Tengchong Rehan geothemal field have acted again since 1993. During the last decade, the hydrothermal explosions and erupting events have occurred over 20 times, and the explosion activity is growing with an increasing strength.Based on the monitoring results of the chemical and isotopic compositions of escaped gases from new hot springs produced by the explosions in the Rehai region, this paper documents the evolutionary characteristics of the explosion activity during the last decade. Evidence from gas chemistry and Helium (isotopes) indicates that the sources of explosion activities show a developing tendrency from the shallow to the deep. We consider,thus, the hydrothermal explosions in the future would be more violent and a serious attention should be paid to its dangerousness.

关 键 词：腾冲热海火山地热区 水热爆炸 阶段性演化 危险性 

分 类 号：P314.1[天文地球—固体地球物理学]