攀西古裂谷实测热流值的地形校正

TOPOGRAPHIC CORRECTION OF MEASURED HEAT FLOW IN PANXI PALEORIFT ZONE, SOUTHWESTERN CHINA

攀西古裂谷地形条件复杂,浅部热流分布不可避免地会受地形影响。我们采用迭代拟合的新方法对11个实测热流数据进行了地形校正。地形绝对校正量变化范围为-9～8mWm^(-2),相对校正量最大达17.1％。攀西古裂谷热流值为论证攀西古裂谷的存在提供了新的证据,并为进一步深入研究该地区的深部热结构奠定了可靠的基础。

Panxi paleorift zone is an area with rugged relief and the heat flow measured at the Earth's surface in this area is inevitably affected by the relief. By using iteration technique developed in our Div. recently, all the 11 measured heat flow values have been subjected to topo-correction. Results indicate that the absolute topo-components in heat flow vary from -9 to 8 mW/m2, whereas the relative ones-from 17.1% to-9.0%. The reliable heat flow value has been used as the strong evidence of the nature of Panxi paleorift zone'and may be considered to be the first step for further studies on the thermal regime and structure of the crust and upper mantle in this zone.