由相对地热梯度推断的腾冲火山区现存岩浆囊  

Present-day magma chambers in Tengchong volcano area inferred from relative geothermal gradient.

作　　者：赵慈平[1] 冉华[2] 陈坤华[2] 

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650224

出　　处：《岩石学报》2006年第6期1517-1528,共12页Acta Petrologica Sinica

基　　金：科技部社会公益专项(2001DIA10003;2002DIA20009);云南省十五重点项目(YN15-02-04)资助研究成果

摘　　要：为利用温泉来研究和监测腾冲火山区的现今岩浆分布并探讨其活动性,提出相对地热梯度的概念:假设各热田或水热活动区的热储深度相等,则热储温度与地表温泉温度之差为该地相对地热梯度。通过对前人在该地区获得的温泉的基本要素和温泉水化学分析数据分析,选取了159个温泉计算相对地热梯度。用这159个数据,通过克里金插值方法获得了腾冲火山区的相对地热梯度平面分布。结果发现腾冲火山区有3个相对地热梯度在100℃以上的高值区域。结合其他资料,认为腾冲火山区现今存在3个岩浆囊,它们的几何尺度为19～28km,深度为4～12km或更深,并且目前的活动性各不相同。In order to understand and monitor today＇s magma chambers＇ distribution and their activities in Tengchong volcano area using thermal spring data, concept relative geothermal gradient is put forward that refers to the temperature difference between thermal reservoirs and thermal springs assuming that the depth of these thermal reservoirs are same. Relative geothermal gradients at 159 sites in Tengchong volcano area are calculated using 159 thermal spring data that are chosen after the data of the basic parameters and the aqueous chemical ingredients of all thermal springs are analyzed. These data of thermal springs are from pioneer researchers of Tengchong volcano. Plane figure of relative geothermal gradient in Tengchong volcano area are obtained with Kriging interpolation using the 159 data. The Plane figure shows that there are 3 anomaly areas where the value of relative geothermal gradient are more than 100℃. The 3 anomaly areas coincide with other data suggests that now there exist 3 magma chambers in Tengchong volcano area whose size （horizontal extent） are some 19 - 28km, depth, some 4 - 12km or more, and activity, very different respectively at present.

关 键 词：腾冲火山 岩浆囊 地球化学温标 地热梯度 

分 类 号：P511.3[天文地球—地质学] P511.4