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《Geology of Chemical Minerals》 2012-01
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Wang Shaohua Tanan Geological Institute of China Chemical Geology and Mine Bureau,Taian,Shandong,271000,China  
The saline ledge were hosting in the paleocene series Paleogene period Tagong group,most K-bearing minerals are carnallites but few k-halite.The gravity value of Vientiane Plain of Laos is negative,the general trend of gravity field is higher at western area but lower at easter(northern) area.The gravity negative anomaly and gravity low are cause by the thicker Cenozoic erathern ledge especially the thicker halite ledge and Cretaceous basement embedding deeply.The gravity high area are opposite with it,which were caused by the thin Paleogene halite ledge and shallow embedding.The thickness varying caused the gradient.The area could be choosed while laying bores for potash exploration with gravity anomaly at the weastern Vientiane plain,where gravity low area and the area at gravity negative anomaly zone and residual gravity anomaly figure,so the first group of bores should laying at the gradient near the centre of gravity low at the gravity negative anomaly area and the residual gravity anomaly figure,that is on the slope near salt anticline center.
【CateGory Index】: P619.211
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