摘要
浙江中生代火山岩区"浅成热液"型金银矿床的控矿或容矿构造多数为张扭性的断裂构造;矿化年龄集中在70～90Ma之间.与含矿围岩的成岩年龄时差达25～47Ma;成矿温度一般在220～260℃:成矿流体主要为低盐度、低密度、低压力的Ca^(2-)-Na^--SO_4^(2-)-Cl-(或HCO_3)型.成矿物质主要是中生代末以大气降水为主要来源的循环地热水、从造山带的火山岩等围岩汲取而来,并根据上述特证.初步建立了成矿模式.
The principal ore-controlling or ore-bearing structures of the epithermal gold-silver deposits in the Mesozoic volcanic rock area of Zhejing are tenso-shear fractures; the mineralization age is from 70-90 Ma, which is 25-47 Ma later than the age of host rocks; the ore-forming temperature ranges commonly from 220-160℃ ; the ore-forming fluid is of Ca2+-Na+-SO2-4-Cr(or HCO3-) type characterized by low-salinity, low-density and low-pressure, the ore-forming material mainly originated from the volcanic rocks in orogenic belt leached by the circulation paleogeothermal water which was mainly derived from Mesozoic meteoric water. On the basis of these characters, the minerogenetic model has been established preliminary.
出处
《矿产与地质》
1991年第3期176-182,共7页
Mineral Resources and Geology
关键词
金矿
银矿
矿床
成因
成矿模式
Epithermal gold silver deposits, Minerogenetic model, Mesozoic volcanic rocks,Zhejiang province.
