湖南澧县凹陷膏盐矿床成矿地质特征及找矿方向

湖南省已知膏盐矿床以中新生代内陆湖相沉积矿床为主，它们的形成具有一定地质构造背景，相互间有密切的联系，在时空分布上具有一定的规律性。其中澧县凹陷膏盐矿产种类较全，储量较大。凹陷西部边坡浅滩相沉积了并经后期改造的特大型石膏硬石膏矿床，凹陷中东部即凹陷中心蒸发沉积了厚大钙芒硝、无水芒硝、石盐矿床。膏盐沉积具明显的水平和垂直分带现象。湘西北区有较多类似凹陷，具有寻找或扩大膏盐矿床规模的有利条件。

The Geological Characteristics and the Orientation of Prospecting about Gypsum Mineral Salt Deposit in Lixian Depression, Hunan Province

The known gypsum mineral salt resources in Hunan province giving first place to middle Cainozoic inland lacustrine facies deposition bedded deposit, their formation has certain geologic structure background , has close connection mutually , has certain regularity on space - time distribution. The kind of gypsum mineral salt mineral deposited is more complete and the reserves are bigger in Lixian sag. The side slope shoal has deposited in the western part of sag and has gone through the super - huge type gupse anhydrite mineral deposit that later stage reforms, there are heavy calcium mirabilite, anhydrous mirabilite and halite mineral deposited in the middle east of sag. The gypsum mineral salt deposition has obvious horizontal and vertical banding phenomenon. There are more similar parts in the north western of Hunan area has sag and it has the advantage seeking or expanding the scale of gypsum mineral salt mineral deposit.