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

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.