论文部分内容阅读
塔西南地区南天山山前和昆仑山山前广泛出露的古近系卡拉塔尔组为新一轮海进的标志。较干旱炎热气候背景下的碳酸盐岩沉积与古河流携带陆源碎屑的注入共同作用的结果形成了包括介壳灰岩、生屑灰岩、鲕粒灰岩等碳酸盐岩,钙质—粉砂质泥岩、钙质砂岩和石膏岩在内各种岩石类型,并在不同沉积环境形成了不同的岩石组合,构建了从陆相冲积扇到海相浅海陆棚的一个完整的沉积体系。该区可划分为冲积扇至浅海陆棚环境的碎屑岩和缓坡至陆棚的碳酸盐岩两种不同的沉积区域,它们之间的相互作用使得卡拉塔尔组形成了复杂的混合沉积现象,其中以间断混合和相混合为主,同时见有源区混合和原地混合类型。控制这些混合过程的主要因素为构造作用、海平面变化和风暴等突发性事件,气候条件和物源区亦可视为频繁影响因素,水动力因素的控制作用则影响较弱。
Paleogene Calataer Formation, widely exposed in front of the South Tianshan Piedmont and the Kunlun Mountains in the southwest of the tower, is the symbol of a new round of marine navigation. The combination of carbonate deposition in the arid and hot climates with influx of terrigenous debris from ancient river flows resulted in the formation of calcareous, calcareous - Silty mudstone, calcareous sandstone and gypsum rock, and formed different rock assemblages in different depositional environments. A complete sedimentary system was constructed from continental alluvial fan to marine shallow shelf. This area can be divided into two types of sedimentary areas of clastic rocks from alluvial fan to shallow shelf environment and carbonate rocks from gentle slope to continental shelf. The interaction between them makes the formation of complex mixed deposits Phenomenon, which is intermittent mixed and phase-based mixed, while see the active zone mixing and mixing type in situ. The main factors controlling these mixing processes are sudden events such as tectonic effect, sea level changes and storms. Climatic conditions and provenance areas can also be regarded as frequent influencing factors while hydrodynamic factors have less effect on controlling.