我国大陆地区大地热流与地壳厚度的变化

本文从我国大陆地区现有的热流观测和深部地球物理资料出发,对1°×1°网格平均热流值（q）与地壳厚度值（M）进行回归分析.结果表明,中国大陆地区作为一个整体,q-M之间存在良好的正相关关系;在111°E以东地区特别是在华北盆地,两者呈显著负相关关系.按地壳厚度分组和按热流值分组的统计结果具有相似的特征,在所有“一分为二”（即只分成小于和大于等于某一指定值）的分组系列中,高值范围的算例都呈显著正相关,回归直线斜率在0.4-2.8mW/（m²·km）的范围内,与国内外报道的地表岩石生热率值一致;而低值范围的算例均给不出清晰的相关关系.作者认为,上述统计结果是地壳岩石放射性生热贡献和来自深部的地幔热流在大地热流二元结构中所起的作用在不同情况下有所不同的体现.

VARIATIONS OF HEAT FLOW AND CRUSTAL THICKNESS IN THE CONTINENTAL AREA OF CHINA

Based on heat flow data updated to 1990 and the related geophysical data, average heat flow values and crustal thicknesses in 1°×1° grid-elements in the continental area of China have been regressed. Results reveal that the relation between these two parameters is positive for the whole area but negative for the area east of 111°E, especially for the North China Basin where deep thermal-tectoni event is on going. In group-series of "one into two" divided respectively according to heat flow value and crustal thickness, groups of higher value demonstrate identically significant positive correlationships with slops varying from 0.4 to 2.8 mW/（m2.km）, coincident with average radiogenic heat production of the crust. Whereas, no clear correlationship can be deduced from the groups of lower value. These phenomena have been interpreted as indications of different roles of crustal radiogenic heat and mantle heat flow in the so called two-component structure of terrestrial heat flow in different cases.