攀西古裂谷地区深部热流

在实测地表大地热流、岩石放射性元素含量以及生热率的基础上,作者计算了攀西古裂谷地区的深部热流值(q_r)及地壳上部放射性元素富集层厚度(D),即分别为38.4mw/m~2和15.7km。与世界上其它地区相比,本区具有较高的深部热流值和较大的D值。笔者进一步阐明,较大的D值是攀西古裂谷地区地壳分异程度差在地热上的反映,而较高的q_r值表明本区来自地壳深处上地幔的热量比较大,这与攀西古裂谷地区的整个地质发展历史相一致。

DEEP HEAT FLOW IN PANXI PALEORIFT ZONE

Based on heat flow measurements at the earth's surface as well as the radioactive element content and heat productivity determinations,the deep heat flow(qr)and the thickness of radioactive element enriched layer in the upper crust (D) have been calculated for Panxi paleorift zone. They are 38.4mw/m2 and 15.7km respectively. Obviously, the studied region is characterized by relatively high qr and larger D value as compared with that in other parts of the world. It is suggested that the larger D value is the reflection of the poor differentiation of the crust,and the relatively high qr value indicates that the heat coming from the deep interior of the crust and from the upper mantle is also relatively high. In addition, an unnegligible quantity of heat generated in the lo-wer crust is believed to contribute to the total amount of the deep heat flow.All these are in good accordance with the history of geological evolution in Panxi paleorift zone.