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Division of the Carboniferous lithostratigraphic units in Awulale area, western Tianshan

2009; Science Press; Linguagem: Inglês

2095-8927

Yongjun Li,

Paleontology and Evolutionary Biology

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). 1:50000 regional 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 351 Ma; 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).