摘要
古构造是控制聚煤盆地形成与演化的首要地质因素。新疆赋煤区是由前寒武纪形成的大陆古板块、微型陆块与古生代形成的造山带镶嵌而成的复合大陆块体。早-中侏罗世,区域挤压应力松弛甚至出现区域拉张应力,盆-山耦合型前陆-克拉通盆地成为新疆早-中侏罗世聚煤盆地的主体;基底性质不同的两个构造单元之间及造山带内部,形成带状拉张断陷;在某些早期弧后盆地和残留海盆分布的地区,发生继承性沉降,成为陆相聚煤盆地。在具有前寒武纪基底的前陆-克拉通盆地和继承性盆地中,聚煤作用最为强盛;发育在古生代造山带之上的伸展断陷型山间盆地,聚煤强度的横向变化较大。
The Paleotectonics is the all-important geological factor to control coal-accumulation basin formation and evolution. The Xinjiang coal hosting area is a compound continental block, a mosaic of Precambrian fossil continental plates, micro-landmasses and Paleozoic orogenic belts. During early to middle Jurassic, regional compressive stress relaxed and even regional tensile stress appeared, basin-mountain coupled forelands and craton basins are the principal part of early-middle Jurassic coal-accumulation basins in Xinjiang. Between two tectonic elements with different basement properties and in orogenic belt interior, have formed zonal faulted depressions;in some early stage back-arc basins and residual marine basins distributed areas, inherited subsidence happened and become limnic coal-accumulation basins. In foreland, craton and inherited basins with Precambrian basement have strongest coal-accumulation effects;extended faulted depression type intermontane basins developed on Paleozoic orogenic belt have rather large coal-accumulation intensity lateral variations.
出处
《中国煤炭地质》
2014年第8期20-23,53,共5页
Coal Geology of China
基金
中国煤炭地质总局立项支持
关键词
煤炭地质
构造控煤
聚煤盆地
古构造
新疆
coal geology
structural controlled coal
coal-accumulation basin
paleotectonics
Xinjiang
