甘肃临泽正北山一带凹凸棒石粘土矿地质特征及成因探讨

Geological Features and Prospecting Marks of Attapulgite Clay Deposits in Zhengbeishan Area,Linze,Gansu Province

临泽县正北山一带凹凸棒石粘土矿位于阿拉善(台隆)铜—镍—铂族—铁—稀土—磷—石墨—芒硝盐成矿带中,含矿地层为古近系渐新统白杨河组,该地层形成时的沉积环境为干旱的盐湖相沉积。在干旱、半干旱的条件下,在富镁、碱性的介质条件下,结晶成凹凸棒石粘土,矿床成因类型为内陆湖泊碎屑沉积矿床。杨台洼滩盆地中心和周边的古近系湖相地层是后期找矿的主要方向。

The attapulgite clay deposit in Zhengbeishan area,Linze County is located in the metallogenic belt of copper-nickelplatinum group-iron-rare earth-phosphorus-graphite-glauber’s salt in Alxa,the ore-bearing stratum is the Paleogene Oligocene Baiyanghe formation,which was formed in the arid saline lake sedimentary environment.Under arid and semi-arid conditions,in the medium rich and alkaline medium condition,the attapulgite was crystallized.The genetic type of the deposit is inland Lacustrine clastic sedimentary deposit.The paleogene lacustrine strata in the center and periphery of the Yangtaiwatan basin are the main prospecting direction in the later period.