西天山阿吾拉勒一带石炭系岩石地层单位厘定
Division of the Carboniferous lithostratigraphic units in Awulale area, western Tianshan
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摘要: 西天山阿吾拉勒地区石炭系，长期以来许多学者和单位，仅根据区域粗略的对比，将其划归早石炭世阿吾拉勒组（“大哈拉军山组”）。1︰5万区域地质调查证实，阿吾拉勒组可以解体为3部分。下部钙碱性火山岩，全岩Rb-Sr等时线年龄为351Ma；中部碳酸盐岩-碎屑岩，富产早石炭世晚期化石，主要有腕足Gigantopraductus和珊瑚Gangamophyllum vetiforme等；上部碱性双峰式火山岩，全岩Rb-Sr等时线年龄为294~313Ma；确认各套地层间均为角度不整合接触。本文首次根据地层多重划分原则，对本区石炭系岩石地层单位进行了解体和再划分，自下而上建立了三个组，下部为早石炭世大哈拉军山组；中部为早石炭世阿克沙克组，上部为晚石炭世伊什基里克组。Abstract: For quite a long time, on the basis of the rough regional comparison, many geologists and organizations have contributing the Carboniferous in Awulale area of western Tianshan to Early Carboniferous Awulale Formation（“Dahalajunshan Formation”）. 1︰50000regional geological surveying confirmed that Awulale Formation can be broken up into three parts. The calc-alkaline volcanic rocks in the lower part, its Rb-Sr isochron age is 351Ma; shallow marine carbonate rock-clastic rocks that were abundant during the Early Carboniferous with Brachiopod such as Gigantopraductu and coral fossils such as Gangamophyllum vetiforme in the middle part；the bimodal volcanic rocks in the upper part, its Rb-Sr isochron age is 294~313Ma. Their contact relationship is angular unconformity. In this paper the Carboniferous of the study area for the first time into major lithostratigraphic units in light of the principle of multiple stratigraphic classificat, three formation are set up in ascenking order：Dahalajunshan Formation（Early Carboniferous）, Akeshake Formation （Early Carboniferous）and Yishijilike Formation（Late Carboniferous）.
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Key words:
- Carboniferous /
- Lithostratigraphic units division /
- Awulale area /
- Western Tianshan /
- Xinjiang
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