摘要
唐家沟-芦家钠长浅粒岩型金矿床是胶东牟平-乳山金矿带内新发现的金矿床类型.通过对金矿床产出地质背景、含金钠长浅粒岩系层位、层序、原岩建造类型、控矿地质条件、围岩蚀变、矿石类型、矿石矿物、包体物理化学、同位素地球化学的研究,阐述了唐家沟-芦家金矿床的形成机理和成矿物质来源.建立了两期一位的成矿模式.确定了该类型金矿床为层控-热液叠加改造型金矿床.并指出了找矿方向.
Alhite-leptynite-typed Au deposit is a new type recently discovered in Muping-Rushan Au ore belt. This paper presents the results of horizon, sequency, proto-rock type of the leptynite and,background, wall rock alteration, ore types, ore minerals, control factors of the deposits, and results of inclusion and isotopes. On the basis of the results ore genesis and source are drawn out. And metallogenic model of two mineralization episodes and one locality of Au ore emplacement is established, i. e. the 1st episode of regional metamorphism metallogenesis from Jiaodong Movement (2.0 Ga), Fenzishan Movement (1.6 Ga) to Penglai Movement (0.6 Ga) during which part of Au in the source bed was mobilized, transported and enriched to form as disseminated and lamellar Au-bearing pyrite albite leptynite ore body (3-7g/t); the 2nd episode of hydrothermal overprinting and reworking metallogenesis on the 1st in Cretaceous Epoch along NNE compression-torsion fractures during which Au-bearing pyrite ore veins and Au-bearing quartz ore veins (7-17g/t) were formed; and one locality is the intersection and coincidence of NEE fractures in Pre-cambrian basement and NNE compression-torsion fracture zones at continental margins.Potential targets are predicted, such as deep level of Bajia-Tangjiagou-Lujia Area, Xibo-Yinggezhuang, Wushan-Xishan Areas. Ore bodies have been encountered at deep level of Tangjmgou and Lujia by drilling.
出处
《地质找矿论丛》
CAS
CSCD
1992年第2期1-14,共14页
Contributions to Geology and Mineral Resources Research
基金
国家自然科学基金9488010
