中国南方现今地热特征  

Present-day geothermal characteristics in South China

作　　者：袁玉松[1] 马永生[2] 胡圣标[1] 郭彤楼[2] 付孝悦[2] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石化南方勘探开发分公司,昆明650200

出　　处：《地球物理学报》2006年第4期1118-1126,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(40172100)资助

摘　　要：根据中国南方地温梯度和大地热流的数据各418个，编制了中国南方地温梯度图和中国南方大地热流图。研究了中国南方现今地温梯度分布特征和大地热流分布特征,结果显示，中国南方地温梯度介于7．82—162．5℃／km。平均24．1℃／km；大地热流变化于22．220mW/m^2之间，平均值为64．2mW/m^2．东南沿海和滇西南地区为高地温梯度分布区，扬子地块为中-低温地温梯度区,地温梯度不仅与区域热构造背景有关，还显著地受地下水热活动、断裂以及地层热导率影响．中国南方大地热流东部、西南部高，中部低，且异常高值点主要沿板块边界缝合带、深大断裂活动带分布．大地热流与区域构造运动、最后一次热事件发生的时间、岩石圈拉张程度、地壳厚度、壳内高导层埋深等因素具有明显的相关性.Based on 418 geothermal gradients and 418 heat flow values from South China, beth the geothermal gradient map and the heat flow map of South China have been constructed. The present-day distributions of geothermal gradient and heat flow have been analyzed. Statistical analysis of the geothermal gradient data show that the geothermal gradients in South China range from 7.82 to 162.5℃/km with a mean of 24.1℃/km. The southeast coastal regions and southwestern Yunnan are characterized by relatively higher temperature gradients than that of Yangtze block. The geothermal gradients are controlled by tectonothermal settings and significantly affected by subsurface hydrothermal activities and thermal conductivities of the rocks. Heat flows in South China vary from 22 to 220mW/m^2 with an average value of 64.2 mW/m^2 . The heat flows in the east and southwest of South China are higher than that in the central areas of Yangtze block and almost all of the significant anomalies of high heat flow values are distributed along deep faults or plate boundaries （sutures）. The heat flow values are related to tectonic activities, the epoch of the last thermal event, the extension of lithosphere, the thickness of crust and the burial depth and/or thickness of high conduction layers in the crust.

关 键 词：中国南方 地温梯度 大地热流 构造热事件 

分 类 号：P314[天文地球—固体地球物理学]