蒙古-贝加尔地区地热特征及其地球动力学机制  

The geothermal regime and geodynamic mechanism of the Mongolia-Baikal rift zone

作　　者：黄方[1] 何丽娟[2] 吴庆举[1] 

机构地区：[1]中国地震局地球物理研究所地球内部物理学与深部孕震环境研究室,北京100081 [2]中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京100029

出　　处：《地质科学》2015年第1期63-73,共11页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：科技部国际合作专项"远东地区地磁场;重力场及深部构造观测与模型研究"(编号:2011DFB20210)资助

摘　　要：蒙古—贝加尔裂谷的演化及其形成的动力学机制一直是地学界争论的焦点。至今,对其地热学的相关研究一直比较匮乏。本文根据前人对蒙古—贝加尔及邻区的独特地貌、构造和玄武岩火山岩浆作用的研究,并结合现今地表大地热流特征共同探讨了其地球动力学机制。根据最新大地热流分布特征表明:蒙古地区的高热流区(>120 mW/m^2)主要集中在蒙古Hangay穹窿北部Hovsgol裂谷及其周围裂谷内;贝加尔裂谷整体热流都较高,且贝加尔东北部热流达160 mW/m^2以上(比前人报道的更高),其中部热流也高(120 mW/m^2)。综合地热、地质与地球物理成果,本文认为晚新生代的地幔柱对蒙古—贝加尔地区的形成起着重要作用。The geodynamic mechanism of the formation and evolution of Mongolia-Baikal rift zone has always been the focus of argument.So far,the research related to the geothermics has always been comparatively absent in the area.Based on the predecessors＇ study on the unique geomorphology,structures and basaltic volcanism,combined with the geothermal study of the Mongolian-Baikal area,its geodynamic mechanism was discussed.According to the latest updated heat flow data from the global heat flow database of the international heat flow commission（IHFC）,we analyzed the latest heat flow in the area.In the Mongolia area,the heat flow of the Hovsgol rift and its adjacent rifts in the northern Hangay dome is highest,more than 120 mW/m^2 ; The heat flow of overall Baikal rift is high.The highest value in the northest Baikal is more than 160 mW/m^2 （higher than the previous reports）; The heat flow in its central part is higher （～ 120 mW/m^2）.Based on the latest data of heat flow and the existing research results,the paper tends to accept a Late Cenozoic mantle plume model as the geodynamic mechanism of the formation of the Mongolian-Baikal area.

关 键 词：蒙古—贝加尔 大地热流 地幔柱模型 动力学机制 

分 类 号：P314[天文地球—固体地球物理学] P542[天文地球—地球物理学]