大地构造相在东昆仑造山带地质填图中的应用

Application of Tectonic Facies in Geological Mapping in East Kunlun Orogenic Belt

不同的造山带是由不同的大地构造相单元组合而成 ,大地构造相的划分揭示了造山带的基本框架和形成演化的规律 .在对东昆仑造山带 1∶2 5万冬给措纳湖幅地质填图中 ,以时间演化和大地构造背景为主线 ,根据不同演化阶段、不同部位出现的构造古地理单元、盆地类型和物质建造类型 ,对填图区大地构造相进行了较精细深入划分 ,共划分出七大相类、2 1种相 ,如扩张洋脊相、分支 (扩张 )海槽相、碳酸盐岩海山相、碳酸盐岩台地相、深海平原相、大陆碎块相、前陆盆地相和磨拉石盆地相等 ,编制了 1∶2 5万冬给措纳湖幅大地构造相图和造山作用过程与大地构造相演变图 .大地构造相在地质填图中的应用进一步深化了造山带填图中的地层单元空间配置关系和盆地沉积充填序列的研究 ,较全面细致地揭示了东昆仑造山带东段造山带形成。

Different orogenic belts are composed of different tectonic facies units. The division of tectonic facies reveals the basin skeleton and the evolution rules of an orogenic belt. In 1∶250 000 geological mapping of the Donggi Conag Hu area in the East Kunlun orogenic belt, considering the timing evolution and tectonic setting as the main clues, and according to the tectono-paleogeography, basin type and matter construction type in different evolution stages, we divide the tectonic facies into seven big facies including 21 small facies, such as extensional oceanic ridge facies, offset (extensional) trough facies, carbonate seamount facies, carbonate platform facies, abyssal plain facies, continental sliver facies, foreland basin facies, molasses basin facies and so on. From this research we have produced a 1∶250 000 tectonic facies diagram of the Donggi Conag Hu area, and diagrams which display the orogenic processes and tectonic facies evolution. The application of tectonic facies in geological mapping deepens the study of the spatial relation of strata units and basin filling sequences during orogenic mapping, and we reveal the forming, substance composition and evolution processes of orogenic belts in the east part of the East Kunlun orogenic belt in detail.