老挝华潘省桑怒矿区硬质高岭土矿床地质特征及成因探讨  

Geological Characteristics and Origin of Hard Kaolin Deposits in Xam Nua Area,Houaphanh Province,Laos

作　　者：李室萱 LI Shi-xuan(Hunan Institute of Geophysics and Geochemistry,Yongzhou,Hunan 425000,China)

机构地区：[1]湖南省地球物理地球化学调查所,湖南永州425000

出　　处：《中国非金属矿工业导刊》2024年第6期13-16,32,共5页China Non-Metallic Minerals industry

摘　　要：老挝北东部桑怒地区的硬质高岭土赋存于泥盆世—石炭世酸性侵入岩的断层构造带内,岩性主要为灰白—浅灰色、略显灰绿色高岭土,残留碎屑结构、显微鳞片结构和交代结构,具块状构造,呈透镜状产出,与区域构造线的展布方向基本一致。成矿母岩为灰白色夹肉红色花岗岩,蚀变作用主要发生在断裂面下盘,以高岭石蚀变为主,围岩伴随有叶蜡石化、硅化和弱绿泥石化蚀变,矿体顶部伴生有薄层团块状、透镜状叶蜡石矿。矿床属火山热液蚀变矿床。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.

关 键 词：老挝 桑怒地区 硬质高岭土 叶蜡石 热液蚀变 

分 类 号：P619.232[天文地球—矿床学]