新疆觉洛塔格地层分区东部石炭系

CARBONIFEROUS SYSTEM IN THE EAST OF QOLTAG STRATIGRAPHIC SUBREGION OF XINJIANG

觉洛塔格地层分区广泛发育早石炭世及晚石炭世早期的火山－沉积建造。以雅满苏大断裂为界，分为南部的雅满苏地层小区和北部的苦水地层小区，为两个不同的沉积构造环境：南部为岛弧火山岩沉积相区；北部为弧间盆地沉积相区。雅满苏小区划分出小热泉子组、雅满苏组、白鱼山组和底坎尔组４个岩石地层单位。苦水小区划分出雅北组、梧桐窝子组、干墩组、白鱼山组和苦水组５个岩石地层单位。分别叙述了两个地层小区岩石地层单位的分布、剖面层序及确定地层时代的化石依据。

The volcanic-sedimentary formations of Early Carboniferous and early Late Carboniferous are widely developed in the Qoltag stratigraphic subregion.To the south of Yamansu fault is Yamansu stratigraphic sub-subregion, and to the north is Kushui stratigraphic sub-subregion, deposited in two different tectonic settings. The former one is of island-arc volcanic sedimentary factes, the latter is of intra-arc basin sedimentary factes. The Yamasu sub-subregion is subdivided into Xiaoruequanzi Formation, Yamansu Formation, Beiyushan Formation and Dikaner Formations while the Kushi sub-subregion is subdivided into Yabei Formation, Wutongyaozi Formation, Gandun Formation, Baiyushan Formation and Kushi Formation. The distribution, stratigraphic sequence and fossils to determine stratigraphic ages of these units are described respectively.