摘要
在西天山阿吾拉勒一带前人确立的大哈拉军山组中,新发现一套富含早石炭世腕足和珊瑚等化石的浅海相碳酸盐岩-碎屑岩建造,其与上覆大陆裂谷双峰式火山岩建造(伊什基里克组)及下伏岛弧钙碱性火山岩建造(大哈拉军山组)间均为角度不整合接触.新发现地层在岩石组合、生物面貌、沉积环境、接触关系等方面均与阿克沙克组层型剖面可对比,故将其从大哈拉军山组解体出来,对比厘定为阿克沙克组.这一地层单位的合理确立,为区域地质填图建立了正确的岩石地层单位,并为本区的地层划分和区域对比提供了新的依据.
A newly found suite of shallow marine carbonate rock-clastic rocks that were abundant during the early Carboniferous with coral fossils in the ＂Dahalajunshan Formation＂ have been confirmed in the Awulale belt of the Western Tianshan. Their contact relationship are in angular discordance with the overlying stratum which are continent rift bimodal volcanic rocks （Yishijilike formation） and the underlying stratum which is an island arc calc-alkaline volcanic suite （Dahalajunshan Formation）. The newly found formation is identical to the Akehsake formation in original stratotype profile in rock association, organism visage and depositional environment and is broken from the＂Dahalajunshan Formation＂. The Akeshake Formation constitutes the right rock-stratigraphic unit for regional geological mapping, and affords a new basis for the stratigraphic division and regional correlation in this area.
出处
《新疆地质》
CAS
CSCD
2006年第3期215-217,共3页
Xinjiang Geology
基金
新疆新源县托库孜库马拉克一带1:50000区域地质矿产调查项目(XJQDW2003-07)资助
关键词
阿克沙克组
地层划分与对比
石炭系
阿吾拉勒
西天山
Akeshake formation
stratigraphic division and stratigraphic correlation
Carboniferous sestem
Awulale Area
Western Tianshan
