铜仁—万山一带辰砂的基本特征  

Main Characteristics of the Cinnabar in Tongren-Wanshan Region

作　　者：陈殿芬[1] 孙淑琼 李荫清[1] Chen Dianfen;Sun Shuqiong;Li Yinging

机构地区：[1]中国地质科学院矿床地质研究所

出　　处：《岩矿测试》1982年第2期36-42,共7页Rock and Mineral Analysis

摘　　要：辰砂是常见的汞矿物。不同矿床类型中辰砂的特征是不同的。本文以铜仁—万山—带汞矿为例,讨论该类型辰砂的基本特征。铜仁—万山汞矿位于湘黔汞矿带南部。矿体产于寒武系石灰岩和白云岩中,区域内未见火成岩分布。矿体呈层状、似层状、透镜状,均由含辰砂的碳酸盐脉组成。The mercury deposits of Tongren-wanshan region occur in carbonate rocks of cambrian.There are no igneous rocks in the region.The present paper deals with the main characteristics of the cinnabar in the mercury deposits.According to data of X-rays diffractions and Intrared spectra of the cinnabar,all of the cinnabars are belonging to a-cinnabar of low-temperature phase of trigonal system.In the deposits three generations of the cinnabar can be recognized.They can be distinguished in the occurrence,crystal habit and content of trace elements of the mineral.The first generation cinnabar occurs as massive xenomorphic-minute granular aggregates in antimory-mercury ore.Content of antimony in the cinnabar arrives at 0.052 wt.%,selenium 0.02 wt.%,Se/Te=53.The second generation cinnabar that forms medium-coarse tabular crystal,occurs in brecciated,striped and vein mercury ores.The cinnabar contains 0.000-7-0.0024 wt.%Sb,0.16-0.19wt.%Se,Se/Te=780-2800.The third generation cinnabar occurs in quartzdolomite miarolitic cavities.It forms beautiful rhombohedral{l011}interpenetiontwins.The cinnabar contains 0.0007-0.0046wt.%Sb,0.25-0.87wt.%Se,Se/Te=1790-3870.The temperature of homogeneity of the quartz intergrown with cinnabar range from 100℃to 190℃.Sulfur isotopic compositions of the cinnabar(5s34)range from 14.1%0to 23.3%o-The salinity of the ore forming fluid range from 14.1wt.%.The ores are fine to coarse crystalline with brecciated and miarolitic structure.For this reason,we suggest that the cinnabar of the region was deposited from heated vadose brine and has no relationship with magma.

关 键 词：矿床类型 辰砂 白云岩 似层状 汞矿 湘黔汞矿带 石灰岩 透镜状 

分 类 号：P61[天文地球—矿床学]