【作者】 魏斯禹； 胡忠义； 邓肖粤；

【Author】 Wei Siyu Hu Zhongyi Deng Xiaoyue (Institute of Geophysics,Chinese Academy of Sciences)

【机构】 中国科学院地球物理研究所；

【摘要】 通过地球表面向外的净热流是地球内部各种过程能量平衡中的一个基本参量,它不仅包括有关地球状态的数据,同时也包括与地球里面热的产生、传递和贮存等过程有关的数据.在攀-西地区研究热流值的变化规律,对确定该带的构造特征、形成和演化及对其在国民经济与地球物理学领域里的意义和作用都十分重要.本文根据地表地热显示和热流分布,并结合地球物理场和地质构造特征来探讨攀-西地带的地壳热状态及它与该区的成矿规律、地震活动与成因以及构造运动间的内在联系.更多还原

【Abstract】 The Pan-Xi region is characterized by complicated structure and frequent earthquakes, where magmatic activities of multiple periods were regularly distributed in the narrow belt along the axis of the tectonic zone.Many crustal movement occurred in ancient and recent time have left abundent traces and formed a unique tectonic system. In order to investigate the relationship among geothermal activity,heat flow distribution and the tectonic movement in this region,the data on surficial hot spring distribution and water temperature have been analyzed,rock samples from deep wells have been collected and thermal conductivity of the rock cores has been measured.The data mentioned above and the measured results of temperature gradient in deep wells have been processed.The wells measured in Pan-Xi are distributed in Taihe of Xichang,Miyi Country,Hongge of Huili country,Yanyuan country and Yanbian country.The obtained heat flow values lie within the range of 50-76 mW/m~2. The results show that on the whole the water-temperature of hot springs at the axis of Pan-Xi tectonic zone is some 5-10℃higher than that of the western and eastern sides.The heat flow value in the deep bore-hole is lower than in the recent rift,volcanic belt and strong tectonic zone,but higher than that of the Oslo ancient rift zone.The value of heat flow in Pan-Xi region seems to lie between the heat flow values of Cenozoic and Paleozoic rifts. Thus it is inferred that Pan-Xi tectonic zone belongs to the ancient rift formed during Middle Proterozoic era and has undergone repeated tectonic movements and reformations thereafter.更多还原