利用大地测量和地热资料联合确定黑水—泉州地学断面东段岩石圈热及强度结构

Refining thermal structure of the lithosphere in eastern section of Heishui-Quanzhou Geotransect with geodetic observations

黑水—泉州地学断面因其所处的特殊地理位置和所受复杂地球动力学机制的影响,而备受地学界的关注.但要弄清控制岩石圈动力机制的重要影响因素之一——热动力,还需对岩石圈的热结构有更细致的研究.地热学研究作为一种独立的地球物理学方法,在地球内部结构及地球动力学研究中发挥着越来越重要的作用.根据地热资料来研究地球深部热结构是一种最为直接有效的方法,但是,我国地热资料的相对匮乏严重阻碍了地热研究的进展.本文将引入地形、重力等大地测量观测资料作为约束条件,基于岩石圈均衡原理,综合地热和重力学方法联合确定黑水—泉州地学断面东段岩石圈热结构,弥补了传统地热研究方法的不足.基于黑水—泉州地学断面岩石圈二维温度分布结果,本文计算了该岩石圈的强度分布,并对其岩石圈的热结构和流变结构特征展开了分析和讨论.

Heishui-Quanzhou Geotransect has attracted geoscientist＇s much attention for its special geographical position and its complex geodynamical process. But, in order to recognize the thermal dynamic of lithosphere, as one of most important influence factors, further research work on lithospheric thermal structure should be carried out. Geothermal research, as one of independent geophysical methods, is playing more and more important role in geodynamical study. It is one of the most direct and effective way to research on the deep thermal structure of the earth by the geothermal data. However, as the geothermal observational data was relative deficient in China, the geothermal research progress was seriously influenced. In this paper, the lithospheric thermal structure of Heishui Quanzhou Geotransect was determined by combining thermal, gravity and local isostasy. The deficiency of traditional method was filled up to some extent by this method. Besides, we calculated the strength distribution of the lithosphere based on the two dimensional temperature results. Finally, the thermal and theological structure features of the lithosphere were discussed and analyzed.