云南白秧坪地区东矿带矿床地质地球化学特征及成因分析  

Geological and geochemical characteristics and genesis of ore deposits in eastern ore belt of Baiyangping area, Yunnan Province

作　　者：何龙清[1] 陈开旭[1] 魏君奇[1] 余凤鸣[1] 

机构地区：[1]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《矿床地质》2005年第1期61-70,共10页Mineral Deposits

基　　金：原地质矿产部定向基金项目(编号:地科定98_13)资助

摘　　要：东矿带是云南白秧坪矿集区的重要组成部分,矿体明显受逆冲推覆构造主推覆断层及反冲断层的控制,多产于上三叠统三合洞组碳酸盐岩地层中。矿床中发育一套典型的中低温热液成因的矿物组合,成矿流体性质主要为来源于深部的中低温热卤水。硫、铅、碳、氧同位素分析表明成矿物质的深源特征,矿石稀土元素组成显示均有明显的δEu异常,构造热流体活动是成矿的主导因素。矿床地质地球化学特征显示,东矿带的矿床成因类型为与推覆构造有关的中低温热卤水铜银多金属矿床。The eastern ore belt is an important component part of Baiyangping ore concentration area in Yunnan Province. Obviously controlled by the main nappe faults and back thrusts of the thrust nappe, the orebodies occur mostly in carbonate strata of Upper Triassic Sanhedong Formation. The mineral assemblage of the ore deposit was formed by low to medium temperature hydrothermal fluids which, in turn, were low to medium temperature hot brines derived from the depth. The sulfur, lead, carbon, oxygen isotopic analyses indicate that the ore_forming substances came from the depth. There are obvious δEu anomalies indicated by ore REE composition. All this suggests that the main metallogenic factor seems to be the activity of tectonic hot fluids. Geological and geochemical characteristics indicate that the ore deposits in the eastern ore belt are genetically low to medium temperature hydrothermal Ag_polymetallic ore deposits related to the thrust nappe.

关 键 词：地质学 铜银多金属矿床 地质地球化学特征 矿床成因 白秧坪地区 东矿带 

分 类 号：P618.41[天文地球—矿床学]