摘要
二甲金矿产于中元古界抱板群中,受区域性的戈枕断裂(韧性剪切)带的控制,抱板群为金的矿源层.区内产出三种类型的金矿化.矿床形成于中温、中压、中等盐度、中性-弱碱性条件下.成矿流体为大气水和变质水、岩浆水的混合热液,以K^+-Na^+-SO_4^(2-)及Na^+-K^+-Ca^(2+)-HCO_3^-Cl^-为主型.硫源具有深源性质.
Erjia gold deposit which occurfes in Middle Proterozoic Baoban Group, is controlled by regional Gezhen fault (ductile shear) zone. Baoban Group is riched in metailogenie elements which make a basis for the formation of Erjla gold deposit. There are three types of gold mineralization in the area. The ore is formed at 190-310℃ and 45.6-50.7MPa with PH value of 8.01-9.25 and Nacl 6.4-9.3%. The ore-forming fluids ale near the area of magma fluid and metamorphic fluid and fall in area of meteroie water in plot. The early stages of ore-forming fluids are transported in the form of K^+-Na^+-SO_4^(2-), and the late, in Na^+-K^+-Ca^(2+)-HCO_3^--Cl^-. Sulfide in wall rocks and ores is from + 1.85 to + 9.76%. This indicates that S in ores is mainly from Baodan Group rocks.
出处
《地质找矿论丛》
CAS
CSCD
1992年第2期24-34,共11页
Contributions to Geology and Mineral Resources Research
