楚雄盆地构造-热演化与古地温场研究

PALEO-GEOTHERMAL FIELD AND TECTONIC-THERMAL EVOLUTION IN THE CHUXIONG BASIN OF CHINA

王国力 蔡立国 汪集旸 施小斌

Wang Guoli Cai Liguo Wang Jiyang Shi Xiaobing

中国石化股份有限公司, 科技开发部, 北京, 100029 2. 中国石化, 石油勘探开发研究院无锡实验地质研究所, 江苏, 无锡, 214151 3. 中国科学院, 地质与地球物理研究所, 北京, 100029

Science-Technology and Development Dept., SINOPEC, Beijing 100029, China 2. Wuxi Research Institute of Experimental Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

楚雄盆地的古地温场演化与构造-热活动及构造变格事件相一致。晚三叠世盆地热流值大体与弧后前陆盆地的热流一致,古地温及地温梯度相对较低。侏罗纪至早白垩世的地温及地温梯度相对于晚三叠世表现出平缓的降低,接近正常的克拉通盆地的热流值分布范围。晚第三纪以来盆地受陆内走滑活动及深部断裂导致岩浆的侵入与热液活动的影响,地温急剧上升,热流增大,现今楚雄盆地为一高热流区就是后期构造-热事件影响的结果。

The evolution of geothermal field and tectonic-thermal activities were all consistent with tectonic events in the Chuxiong Basin. The heat flow values of the basin in the Late Triassic was similar to that of retro-arc basins in the world, but the thermal field and thermal gradient were slightly lower. The thermal gradient and thermal current were gradually weakening in the Jurassic and the Early Cretaceous as compared with those in the Late Triassic in the basin, which were close to the values of thermal flow in crato-nic basins. The thermal gradient and thermal flow were rapidly raised in the Cenozoic as intra-continent strike-slip activities and magmatic injection happening along deep faults. The formation of high thermal field in the basin was the result of tectonic-heat activities.

中石化科技项目(P04040)。

https://doi.org/10.11781/sysydz200501028