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《Geology of Chemical Minerals》 1996-01
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MODERN SALT LAKES IN YIKEZHAO LEAGUE,INNER MONGOLIA:GEOLOGICAL CHARACTERISTICS AND TRONA-FORMING CONDITIONS

Yang Qingtang (MCI Geological Institute for Chemical Minerals)  
In Yikezhao League,Inner Mongolia,there lie a number of modern salt lakes, many of which are accumulated with such trona,mirabilite,halite and the like probably used for chemical industry.Overlying Cretaceous sandstone base,the lake accumulation consists of nothing but cycles of clastic rock to claystone to evaporite, with a total thickness of 10 m.The crystallized salt layers occur as massive and thick-beded,the spatial distribution controlled by the geographic layout of the tectonic-activated lakes.As for trona-forming conditions,what should be stressed is prolonged epidenudation which caused surface and ground waters to immigrate into old channels and blowouts,conveniently not only dissolving the soluble salts form the denuded rocks but carrying them into the lakes.Later,weather having turned cold suddenly,the lake water became oversaturated with Na_2CO_3 and Na_2SO_4to eventually precipitate down Na_2CO_3·10H_2O and Na_2SO_4·10H_2O.In this case,a general salt lake converted into a trona lake.
【CateGory Index】: P619.211
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