新疆东昆仑西段黄沙河地区托库孜达坂组地质特征及沉积环境分析

Analysis on Geological Characteristics and Sedimentary Environment of Tokuzi Daban Formation in Huangshahe Area in West Section of Eastern Kunlun in Xinjiang Uygur Autonomous Region

摘要:

黄沙河地区位于新疆东昆仑西段南缘，属于昆南增生杂岩带，研究区内出露大面积下石炭统托库孜达坂组，为了厘定区内托库孜达坂组时代并对其沉积环境进行分析，本文在详细的野外地质调查基础上，通过地层层序学、岩石学及古生物学研究，将新疆东昆仑西段黄沙河地区托库孜达坂组分为下段碎屑岩段和上段碳酸盐岩段，将其时代厘定为早石炭世，结合区内碎屑岩粒度特征及放射虫化石特征，确定该套地层的沉积环境为半深海滨浅海环境。

Abstract:

Huangshahe area is located in southern margin in west section of eastern Kunlun in Xinjiang Uygur Autonomous Region. It belongs to Kunnan accretionary complex belt. A large area of lower Carboniferous Tokuzi Daban formation （C1tk）is exposed in the study area. In order to determine stratigraphic age of Tokuzi Daban formation in the area, sedimentary environment has been analyzed. Based on detailed field geological investigation, through stratigraphic sequence, petrology and paleontology, the Tokuzi Daban formation in Huangshahe area in the west section of east Kunlun in Xinjiang Uygur Autonomous Regionis has been divided into the lower clastic rock section and the upper carbonate rock section. Its age is determined as the early Carboniferous. Combining with the grain size characteristics of clastic rocks and the characteristics of radiolarian fossils, it is determined that the sedimentary environment of this set of strata is semi deepcoastal shallow sea environment.