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SPATIAL DISTRIBUTION ON HALITE IN THE KUQA DEPRESSION IN PALEOGENE AND SIGNIFICATION OF POTASH SURVEY

Tang Min;Cao Yangtong;Jiao Pengcheng;Hu Yanna;The First Geological Brigade,Nonferrous Metals Geological and Mineral Resources Bureau of Henan Province;MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources,CAGS;Beijing An'tai Energy and Technology Ltd.;  
Evaporites with gigantic thickness had been developed in Kuqa Depression from Paleocene to early Mioce ne, and the sediment thickness changed from tens to thousands of meters, most of the sediment of evaporite(especially the halite) appeared from Paleocene to early Miocene. We can search the spatial distribution model of halite in Kuqa depression and draw its model from Paleocene to Miocene, according to the 3D mine mineral software, statistical data of, China coordinate in Kuqa Depression, partial drilling data(including hole site, hole depth, hole deviation), the sedimentary thickness of halite layer in the drilling and evaporite sedimentary cycle. It is closely interrelated on salt body, terrain and structure of Kuqa Depression by spatial distribution model of evaporates, and the halite is consistent with topographic relief by tectonic compression. Two deposition centers of evaporates appeared in the west of Kuqa Depression by section cut north to south of spatial distribution model, and they are located in the area of Xi yan ditch and Baicheng sag. They are usually ancient salt lake concentration center, Such as Kuqa Depression which developed deposition centers of evaporates, however, the little tectonic units are good place for potash exploration, and are also the places which potassium enrichment in.
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