CHARACTERISTICS OF THE LATE CARBONIFEROUS FLYSCH FORMATION IN LIUSHUGOU-URHO, XINJIANG

更新时间:2023-08-14

【摘要】In early Late Carboniferous only the South Junggaru-Bogeda area of the ancient North Xinjiang geosynclinal region was still in the geosynclinal stage,when it was the critical Period for closing of the geosynclinal region. The crust movement was in a special form with frequent rhythm,and there developed a typical flysch formation in Liushugou-Urho in Late Carboniferous. A thorough investigation and study on the flysch formation have been carried out,based on a great number of the firsthand field information and experiment analytical data.The Late Carboniferous flysch formation in Liushugou-Urho,Xinjiang,formed in the Bashkirian .consisting mainly of the Baogutu Formation. There are outcrops if the flysch at Liushugou ,Kesongertai, Kayinte, Hatu, Dongfeng Wudui, Urho, etc. The outcrops at Kesongertai and Urho, 422m and 1228m thick respectively,are more typical and complete flysch formation.The Late Carbonilerous flysch formation in Liushugou-Urho consists mainly of the rhythmic series of sandstone and shale. The shale (or mudstone) component increases southeastward to Urho and sandstone component increases southwestward to Liushugou-Kayinte. Body fossils are seldom in the formation but the Nereites ichnofacies are common. The distribution of trace elements is stable and belongs to the regular pattern. THe flysch formation at the Urho formed chiefly in a bathyal sedimentary environment,possessing a complete transgressive-and-regressive sequence. At Liushugou -Kayinte, the formation can obviously be divided into the upper and lower parts. The upper formed in a littoral-neritic oscillatory environment,while the lower deposited in a bathyal turbidite basin. The two parts constitute a transgressive sequence.

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