全球大地热流-岩石生热率关系综合分析

AGGREGATE GLOBAL SCALE ANALYSIS OF RELATIONSHIP BETWEEN HEAT FLOW AND HEAT PRODUCTION

大地热流分析是研究大地构造地球动力学和地壳化学组成的一个重要手段通过对全球范围大陆地区大地热流和岩石放射性生热率数据的综合统计分析探讨地壳一地慢热流配分统计结果揭示，全球尺度显生亩地质构造区热流与岩石生热率之间不存在简单的线性关系，但两者在隐生宙地盾区却具有明显正相关关系从大地热流-岩石生热率关系在显生亩地区和在隐生宙地区的差异可以大致确定壳-幔热流成分的变化范围取地壳厚度为30－50km，根据前寒武地盾区热流与生热率之间的统计关系可以进一步推测地壳岩石中放射性生热元素的平均丰度范围分别为铀（0．5—1．6）×10－6，钍（1．8－6．1）×10－6，氧化钾0．6％-1．9％．

Heat flow analysis is of importance in understanding the gedynamics of tectonics and the chemical composition of the crust. We interrogate the global heat flow database for insights into the nature of the partition of continental heat flow between crustal and mantle .out.ibutions. Results show that while surface heat flow cannot be described with confidence as a simple linear function of heat production on a world-wide basis in Phanerozoic terrains, there exists in aggregate a clearly positive trend between the two valuables in Precambrian terrains. The contrast in the q-A relationships in Phanerozoic and Precambrian allows a first order estimate Of the variability of the heat flow components. Along with otherconsiderations, the relationship of q=38.6+4.5A regressed from Precambrian data set provides the following constraints on the average abundances of heat production elements for a crust of 30-50 km thickness: uranium (0. 5-1. 6)×10-6, thoritirn (1. 8-6.1)×10-6,and K2O 0. 6%-1. 9%.