Carboniferous Lithofacies Paleogeography In Junggar And Tuha & Santanghu Basin

There are 7 small stata partition and 9 big structure partition in the Junggar and Tuha & Santanghu Basin.I have discovered 6 type depositional system,11 type sedimentary facies and 20 sedimentary intrafacies.For example,in the Xilikeqi and Baiyanghe area,I fistly find containing Bouma cycle deep sea flysch.According to Carboniferous deposit feature in the Junggar basin,I divide Carboniferous vertical deposition feature in the Junggar basin into closing provenance group,transit provenance group and incomparably provenance group.Using this division we can divide crop and well deposition feature,and that can be used: 1)According to proportion of the different group,we can analyse this section’s provenance that is far or close.2) According to evolution of the different group in vertical deposition feature,we can analyse the tendency of the environment evolution.3) According to the volcanic rock feature in the section,we can analyse the volcano’s feature in the time. According to the early Carboniferous feature of correlation of profile, Lithofacies of region of interest center is that ancient land centered the Junggar-Tuha ancient land,and which around had palaeo-ocean.In the late Carboniferous,the Lithofacies was‘North Land,South Ocean’. In the early Carboniferous,the deep sea facies mostly grew in the north-west area,such as Xilikeqi, Baiyanghe,Daerbute and Qijiaojing area.In this time, deep sea flysch is the feature.The epicontinental sea grew between several ancient land that was a wide place in the early Carboniferous. The Junggar-Tuha ancient land was the center of the wide epicontinental sea.Besides the lagoon in the north of Junggar-Tuha ancient land was the salient feature of the early Carboniferous. The main lithology of this time were bioclastic limestone and black mudstone that are good source rock,and this time is main source rock growing time.The early Carboniferous’volcanic rock were main island arc volcanic rock which is thickness and basic volcanic rock. In the late Carboniferous,The features of structure and sedimentary are voclanic rock in rift basin and many small ancient land in the Junggar basin.The ancient lands of late Carboniferous were mainly growing in the north-west and east of the region,in which,there are the Altaides ancient land in the north , the Kazakhstan ancient land in the west, the northern tianshan ancient land in the south and Tuha ancient land in the east. The epicontinental sea facies were mainly growing the wide west and south of the ancient land.The remainder sea of Fuhai area was the big feature in the south of Altaides ancient land.The volcanic rocks of late Carboniferous were main voclanic rock in rift basin,and their thickness had become thin,and the lithology had become kindly.