摘要
福建建阳水吉Ⅵ号矿带铅锌银矿床是我省首次探明的一个中型规模的铅锌、银共生矿床。矿体产在新华夏系北北东向的 F_11断裂中。主矿体ⅥA_1呈似层状,长900多米,延深600米以上,总体走向3°—5°,倾向北西,倾角45°—55°,沿走向、倾向均呈舒缓波状变化。矿体厚1—7米,平均近6米,矿体形态较规则。矿石结构主要为半自形—自形粒状、他形粒状、聚粒锒嵌状。矿石构造以斑杂状—斑点状、角砾状、浸染状、细脉浸染状为主。矿体含Pb2%、Zn1.4%、Ag 约50g/t,它们的分布较均匀;伴生有金、砷、镓、铜、硫等元素。矿体顶板围岩主要为构造角砾岩和闪长岩,底板围岩一般是云母斜长变粒岩。近矿围岩具蚀变分带现象。这是一个与上元古界麻源群第一段地层、新华夏系北北东向断裂构造、燕山期中基性侵入岩有密切关系的火山沉积变质—热液改造型矿床。
The Pb-Zn-Ag mineral deposite of ore zone Ⅵis a paragenetic ore deposit in medium scale,thatfirst is demostrated in Fujian.The Pb-Zn-Ag ore bodies occur in NNE-trending F11 fracture of Neo-cathaysian.The main ore body is found as stratoid form,which length is more than 900m,and stretchesover 600m.Overall occurece strikes 3°—5°,dipping to northwest.Its angle of inclinatio is 45°—55°.They show gentle changes like wave along the strike and the dip.Ore\body's thickness is 1—7m.Meanthickness is near to 6m.Its shape is regularer.Ore textures are mainly hypidiomorphic—idiomorphicgranular,xenomorphic granular and sammel-mosaic.Ore structures are mostly taxitic-spotted,brecciat-ed,disseminated and veinule-disseminated.The mean contents of Pb,Zn and Ag in ore bodies are re-spectively 2%,1.4%,50g/t.Their distribution in ore are rather even with associated elements,suchas Au,As,Ga,Cu and S.Country rocks in roof of ore bodies are mostly structure breccia and dior-ite.Country rock in floor of ore bodies is generally mica-plagioclase leptynite.Country rocks of nearore have alteration zoning.This deposit is a volcanic sedimentary metamorphic-hydrothermal reformation ore deposit,closelyrelating to the first member of Mayuan Group of Upper Proterozoic,the NNE-trending fracture of Neo-cathaysian and the medium-basic intrusive rocks of Yanshanian.
出处
《福建地质》
1990年第4期256-265,318,共10页
Geology of Fujian
