摘要
葛坪铅锌矿床位于浙江西南遂昌县境内,矿体主要呈脉状产于下元古界八都群变质岩中,目前已探明其为中型规模。在对该矿床成矿地质背景和矿床地质特征已有认识的基础上,根据野外平硐编录及室内岩相学研究成果,确定了该矿床的围岩蚀变特征并进一步讨论了围岩蚀变与不同矿化类型之间的关系。结果表明,葛坪铅锌矿床存在浸染状与脉状两类矿化类型,围岩蚀变强烈,各类蚀变叠加现象明显,无明显分带性。蚀变与铅锌矿化在时间上关系密切,其中与浸染状矿化相关的蚀变主要为早阶段透辉石化—绿帘石化—透闪石化—阳起石化,与脉状矿化相关的蚀变主要为中阶段绿泥石化—绢云母化,在晚阶段硅化中也伴有零星细脉状铅锌矿化。阐述了围岩蚀变与矿化在空间上的关系,认为其可作为一种重要的找矿标志。
The mid-scale Geping Pb-Zn deposit is located in Suichang county, southwestern Zhejiang Province, and the vein-dominated ore bodies are hosted by metamorphic rocks of the early Proterozoic Badu Group. Based on metallogenic background study, as well as adit catalog and petrographic observation, this paper is mainly concerned with the wall-rock alteration characteristics and the spatial relationship of the alteration assemblages to related mineralization types. We found that, disseminated and vein mineralization is existing in Geping Pb Zn Deposit, and wall-rock alterations were intensive and superimposed in this deposit, leading to no obvious mineral zonations. Alterations had close temporal and spatial relationships with lead-zinc mineralizations, for instance, early diopsidization-epidotization-tremolitization-actinolitization with disseminated mineralization, later ehloritization- sericitization with vein mineralization, and the latest silicifieation with sporadic thin-vein mineralization. The relationships between alterations and mineralization could be important prospecting criteria in the deposit.
出处
《有色金属（矿山部分）》
2015年第3期33-41,共9页
NONFERROUS METALS(Mining Section）
基金
中央地质勘查基金项目(2009330001)
关键词
围岩蚀变
矿化类型
葛坪铅锌矿床
wall-rock alteration
mineralization type
Geping Pb-Zn Deposit
作者简介
欧阳永棚（1988-），男，助理工程师，硕士，矿产普查与勘探专业，主要从事地质矿产勘查工作。
