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自黄汲清教授于1945年首次提出地槽褶皱系的多旋回发展概念以来,得到了国内外地质工作者的广泛引用。他指出我国多数地槽褶皱系都具有多旋回发展的特点。经过对天山、祁连山、秦岭等地槽褶皱系的深入研究、对比之后,初步建立了多旋回发展的模式。现以横断山区地槽为例来讨论该褶皱带中的多旋回发展特点。 横断山区位于青、藏、川、滇四省、区交接地带,其地质构造位置,正处在特提斯—喜马拉雅构造域东段拐弯部位,恰是欧亚板块与印度板块的拼合地带。根据作者在“三江地质志”构造组最近总结的资料,可把横断山区的构造单元划分如下(图1):
Professor Huang Jiqing first proposed the concept of polycyclic evolution of the geosynclinal fold system in 1945 and has been widely used by geologists at home and abroad. He pointed out that most of the geosynclinal fold systems in China have the characteristics of multi-cycle development. After the Tianshan, Qilian Mountains, Qinling and other geosynclinal fold system in-depth study, after contrast, the initial establishment of a multi-cycle development model. Here is an example of the traversal of the mountainous area to discuss the multi-cycle characteristics of the fold belt. The Hengduan Mountains are located at the intersection of the four provinces of Qinghai, Tibet, Sichuan and Yunnan. The geological structure of the Hengduan Mountains is at the corner of the eastern part of the Tethys-Himalayan tectonic domain. It is precisely the jointed area between the Eurasian Plate and the Indian Plate. According to the data recently summarized by the author in the “Sanjiang Geology” tectonic group, the structural units in the Hengduan Mountains can be divided as follows (Figure 1):