广西全州县两河源洞锌矿床地质特征及成因探讨

GEOLOGICAL FEATURES AND GENESES OF YUANDONG ZINC DEPOSIT IN LIANGHE COUNTRY OF QUANZHOU COUNTY OF GUANGXI

源洞锌矿床赋存于上泥盆统一下石炭统可溶性碳酸盐岩中被改造的古岩溶洞穴内,与属岩溶成因的钙质砂岩、溶塌角砾岩、白色粗～巨晶方解石团块共同组成古岩溶建造;矿体形态复杂,产状变化大,矿石具胶状、变胶状、溶蚀残余或痕迹状构造;矿物流体包裹体成分、稳定同位素表明成矿溶液具岩溶水特征,成矿物质来源于围岩;分散元素以 Ga、Ge 为主。据此认为源洞锌矿床属低温热液岩溶型矿床。

Yuandong zinc deposit reserves in the reformed ancient karst caves in soluble carbonate rocks of upper Devonian and lower carboniferous series.The deposit,calcareous sandstone of karst genesis,solution breccia and white coarse-giant crystalline calcite lumps compose an ancient karst formation.The orebody's shape is very complicated,its attitude changes greatly, its ore is of colloidal,metacolloidal,corroded remnant or marking structure.The composition of fluid inclusions of minerals and stable isotopes show that the metallogenetic fluid is of the features as karst water,the metallogenetic material originates from wallrocks,and the major dispersed elements are Ga and Ge.In the view of the above,Yuandong zinc deposit belongs to epithermal karst type deposit.