Geological Characteristics and Origin of Hard Kaolin Deposits in Xam Nua Area,Houaphanh Province,Laos
Hard kaolin occurs in the east of Laos in the fault zone,lithology is mainly gray,light gray,slightly gray green kaolin,variable crystal structure,with massive structure,a lens output,surface expose thickness 6～10m,north west direction,and the same direction of the regional tectonic line.The parent rock is gray-white and red granite.The ore-forming mother rock is grayish white red granite,and the alteration mainly occurs in the footwall of the fault surface,mainly kaolinite alteration,the surrounding rock is accompanied by pyrophyllite,silicification and weak chlorite alteration,and the top of the ore body is associated with thin stratified and lenticular pyrophyllite deposit.The deposit belongs to volcanic hydrothermal alteration deposit.
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