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硝沟矿区位于西宁东约10公里的小峡附近,是民和——西宁中、新生代盆地中的特大型钙芒硝矿床的一个矿段。钙芒硝矿层赋存于上白垩统民和组泥页岩中,矿层稳定,厚度大(一般60米左右),倾向 NEE—SEE,倾危5°—8°。分红色矿石和灰——灰绿色矿石,二者呈互层产出。经过长期的地质作用,原生钙芒硝矿在不同部位逐渐形成一种次生产物——石膏和芒硝。本文试图就次生芒硝的形成过程,提出一点粗浅认识,因水平所限,谬误之处,
Located in the vicinity of a small gorge about 10 km east of Xining, the Nitigou mining area is a mine section of extra large glauberite deposits in the Minhe-Xining Cenozoic and Cenozoic basins. Glauberite deposits occur in Upper Cretaceous Minhe Formation shale, with stable ore layers and large thickness (usually about 60 meters), with a tendency of NEE-SEE of 5 ° -8 °. Divided red ore and gray - gray green ore, the two were inter-layer output. After long-term geological effects, the native glauberite mine gradually formed in the different parts of a secondary product - gypsum and thenardite. This paper tries to put forward a little superficial understanding on the formation process of secondary thenardite, because of the limited level and the fallacy,