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Urunchi, China

Chen Z.,Chinese Academy of Geological Sciences | Lu K.,No. 216 Geology Party | Wang G.,No. 216 Geology Party | Chen B.,Chinese Academy of Geological Sciences | And 3 more authors.
Acta Petrologica Sinica | Year: 2010

Huge-thick Mesozoic-Cenozoic sediment deposited in the coupling areas of the southern margin of Junggar basin with north of Tianshan mountains, where Cenozoic deformations widely spread and was regard as a natural laboratory to study the dynamics of relationship between basin and range, and also was one of favorable ore-prospecting areas for sandstone-type uranium deposits. Prior data and our own field observation indicated that the area can be divided into two pails according to the characteristics of Cenozoic tectonic movements. Intense Cenozoic thrust motion took placed in north areas of Bogeda mountains, where several present active thrust faults developed. Three or four pattern fold-thrust fault belts developed in west of Urumuqi, and east of the south Wusu City in northern edge of Tianshan mountains. Calcite and gouge were collected from thrust faults in north Bogeda mountain and were dated using the ESR (Electronic Spin Resonance) method, which revealed 0.7 ∼ 1. 0Ma and 0. 25Ma in age as an important active time of the FukangJimusaer fault and the north Santai fault, respectively. The controlling of the Cenozoic deformation to the mineralization of sandstone- type uranium deposits was also discussed in this paper based on the analysis of distribution law and metaliogenic elements of sandstone- type uranium deposits. It was suggest that the first-pattern structural zone in western fold-fault belts is one of the best ore-forming regions for sandstone-type uranium deposits, while north areas of Bogeda mountains are not favorable for mineralization because of the intense Cenozoic deformation. Therefore, a new model named as tectonic-prefer controlling ore-formation model was proposed and favorable ore-prospecting areas were predicted in southern margin of Junggar basin.

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