地质学报2012，Vol.86Issue(12)：1972-1993,22.
四川省九龙县黑牛洞铜锌矿的矿床地质特征、成因及其成矿时代
Geological Characteristics, Genesis and Metallogenic Time of the Heiniudong Copper-Zinc Deposit in Jiulong County, Sichuan Province
摘要
Abstract
Through geological mapping, trenching, drilling, and indoor analyses, the Heiniudong Copper-Zinc Deposit was a large or even super-large marine volcanic-associated massive sulifide deposit (VMSD) in the passive continental margin rift during the middle Proterozoic. The ore-bearing country rocks contain mylonites, phyllonite, mylonitic shists, quartz-blastic mylonites, and tectonites, with orebodies hosted in shear-type mineralization and alteration zones. The primary rocks are quartz sandstones, mud-quartz siltstones, argillites, and siliceous rocks, intercalated with mafic rock and minor intermediate-acidic, acidic volcanic rocks, and are characteristic of high greenschist - low amphibolite facies by metamorphism. The deposit dominated by massive, para-massive and brecciated ores is enriched in copper, with an average Cu grade of 1. 68% and an average Zn grade of 1. 53%. Mineralization is closely related to bleached zone and silicification. Mineralization is characterized by extensively-developed ductile shear-type disseminated rock or ores and is of the same deformation features as mylonite and phyllonite. Multiple mineralized metallic lens, deformation bands and microfolds can be found in the ores. Texture and structure of the ores, and their spatial and temporal distribution, and H, O, S, Pb and Si isotopic features show that massive, para-massive and breccias ores are shear-type mineralized rocks or ores, suggesting that the deposit is a metamorphosed deposit, i. e. a reactivated deposit from primary ores. The shear-type mineralized rock or ores are likely a dissolution-dominated reactivated residual of the VMSD deposit which underwent multiple ductile deformation and metamorphic deformation due to middle Proterozoic submarine volcano and rifting. The deposit is characterized by in-site ductile deformation and metamorphic regeneration, with the mineralization age in late Yanshanian epoch (134. 26 ± 0. 5Ma).关键词
剪切型矿石/剪切型铜锌矿床/构造改造/变质生成矿床/再生矿床/黑牛洞铜锌矿床/里伍矿田Key words
shear-type disseminated ores/ chemical remobilization remains/ regenerated deposit/metamorphogenic deposit/ Heiniudong Cu-Zn Deposit引用本文复制引用
李建忠,刘宇平,沈战武,马国桃,祝向平,唐高林..四川省九龙县黑牛洞铜锌矿的矿床地质特征、成因及其成矿时代[J].地质学报,2012,86(12):1972-1993,22.基金项目
本文为国土资源部矿产资源补偿费矿产勘查项目"四川省九龙县里伍铜矿外围普查"和"青藏高原东缘地震活动带基础地质综合调查(编号1212010918010)"资助的成果. （编号1212010918010）
