新疆阿克陶县库山河地区晚泥盆世奇自拉夫组沉积相与沉积环境分析

新疆阿克陶南库山河一带晚泥盆世奇自拉夫组地处塔西缘昆仑构造带西北部。根据宏观颜色、岩石组合、岩石结构、沉积序列、沉积构造、古生物特征等由底到顶依次划分为灰红色含砾岩屑粗碎屑岩段、灰红色岩屑砂岩与灰绿色石英砂岩互层岩段和灰绿色钙质石英粉砂质细碎屑岩段等3个岩性段；冲积扇、扇三角洲、滨海等3个亚相和8个微相。为明显的无障壁岛滨海相陆缘沉积物向海退积的海进序列。

An analysis of the sedimentary facies and environment of the Late Devonian Qizilafu Formation in the Kushanhe area, Aketao county, Xinjiang

The Kushanhe area is located in the south of Aketao county, about 28km to the county town, Xinjiang, where exists the Qizilafu Formation of Late Devonian. Tectonically, it lies in the west part of the Kunlun orogenic belt. Based on macro colors, rock combinations, rock structure, sedimentary sequence and texture, and paleontological features, from the bottom to the top, it can be classified into three lithological sections, i.e., grey-red clastic rocks bearing coarse detritus of conglomerate, interbedded grey-red detritus sandstone and grey-green quartz-sandstone, and grey-green fine clastic rocks of calcareous quartz-silts. The sedimentary environment comprises three sub-facies, i.e., alluvial fans, fan deltas, and offshore, and eight micro-facies. Apparently, it is a transgression sequence caused by continental-margin sediments of barrier-free islands and offshore facies that retreated and deposited toward the ocean.