陕西石泉_汉阴北部下志留统黑色岩系中的金矿床

黑色岩系是含有机碳质的碎屑沉积岩和化学沉积岩的总称，其物质来源的多源性和深源性使之成为较丰富的多种金属元素聚集层.鉴于其科学上的意义及经济上的重要性，近几年再度成为专家学者研究的热点［1］.秦岭造山带黑色岩系分布广泛，按产出地质背

景、岩石组合划分为南、北、中3个含矿岩系带［1-2］.北带有商州市清岩沟钼-镍矿床.中带有山阳县夏家店

钒-金矿床、山阳中村银花钒矿.南带有安康市鲤鱼山含钼-钒矿［1-3］，以及黄龙、鹿鸣、酒店、羊坪湾、流芳等10余个低品位金矿.东西长约100km ，南北宽10~20km

GOLD DEPOSIT IN THE LOWER SILURIAN BLACK ROCK SERIES IN NORTHERN SHIQUAN -HANYIN,SHAANXI PROVINCE

LIU Lin 1,2,WU Jing -ping 3,YANG Yi 2,YANG Xu -zhou 2

（1.No .6Geological Team,Shaanxi Bureau of Geology and Exploration,Xi'an 710065,China ;2.Xi'an Eurasia University,Xi'an 710065,China ;

3.College of Earth Sciences,Jilin University,Changchun 130061,China ）

Abstract ：The gold deposit belt of black rock series of Lower Silurian Meiziya Formation in Northern Shiquan -Hanyin is

tectonically located in the north margin of Niushan Old Land in the west of South Qinling Orogenic Belt.The ore belt is about 100km long in E -W direction and 10-50km wide in S -N direction.The early exploration has ascertained that the Lower Silurian Meiziya Formation was the ore -bearing layer of the gold deposits in this region.Based on the lithological assemblage characteristics,it is divided into six lithologic members and four ore -bearing sub -layers.More than ten gold deposits have been found in this ore belt.The gold deposits in this belt,controlled by stratigraphic,lithologic,paleogeographic and paleo -structural conditions,are homologous with the black rock series.The gold occurs mainly in particles and is unevenly distributed.The isotopic data show that the sulfur was originated from the strata.The characteristics of hydrogen and oxygen isotopes indicate that the aqueous media of the ore -forming fluid are mixed water containing mainly metamorphic -hydrothermal solution and atmospheric precipitation.The REE features reveal that the material source of gold deposits is similar to the Devonian sedimentary rocks in Qinba area.Ductile shear zone is not the necessary indicator for the existence of gold orebodies.Therefore,the gold ore in Meiziya Formation is a kind of sedimentary deposit.

Key words ：gold deposit;geological characteristics;black rock series;Shiquan -Hanyin;Shaanxi Province

收稿日期：2011－03－01.编辑：李兰英．

作者简介：刘林（1967—），男，硕士，地质工程师，讲师，从事地质矿产勘查和空间数据挖掘研究，通信地址陕西省西安市电子城欧亚路1号，E -mail//liulin1885@

陕西石泉-汉阴北部下志留统黑色岩系中的金矿床

刘

林1，2

，吴景平3，杨

译2，杨旭周2

（1.陕西省地勘局第六地质队，陕西西安710611；2.西安欧亚学院，陕西西安710065；

3.吉林大学地球科学学院，吉林长春130061）

摘

要：石泉-汉阴北部下志留统梅子垭组黑色岩系金矿带位于南秦岭造山带西部的牛山古陆北缘.该矿带东西长约100km ，南北宽10~20km.初步查明下志留统梅子垭组为区内金矿含矿层位，并按其岩性组合特征划分为6个岩性段，4个子含矿层位.矿带内发现10余处金矿床（点）.金矿受地层、岩性、古地理和古构造条件控制，与黑色岩系具有同源性.金主要以颗粒金存在且分布极不均匀.硫同位素的变化范围说明硫来源于地层.氢氧同位素的特征说明成矿热液中的水介质是以变质热液和大气降水为主的混合水.稀土元素特征显示金矿物源与秦巴地区泥盆系沉积岩相似.韧性剪切带并不是金矿体出现的必须标志.研究认为梅子垭组中的金矿属沉积型矿床.

关键词：金矿床；地质特征；黑色岩系；石泉；汉阴；陕西

文章编号：1671-1947（2011）04-0304-06

中图分类号：P618.51

文献标识码：A

地质与资源

GEOLOGY AND RESOURCES

第20卷第4期2011年8月

Vol.20No.4

Aug.2011