摘要
凤太矿集区是秦岭铅锌金成矿的重要组成部分,铅锌矿主要集中分布在矿集区的西部,可划分为南部的铅硐山―水柏沟铅锌(铜)矿带和北部的八方山―八卦庙―银母寺铜铅锌金矿带。目前区内发现的大、中型铅锌矿床均具有"沉积相+层位+构造"的"三位一体"的成矿规律,即热水喷流沉积是成矿的必备条件,古道岭组灰岩与星红铺组千枚岩接触面及附近是赋矿的主要层位,NWW向褶皱和断裂是控矿的重要因素。根据区域成矿规律、前人经验和野外总结,提出已知铅锌矿床的走向延伸部位、已发现矿体但勘查程度低的控矿背斜倾伏部位、受同一背斜控制的两个铅锌矿床之间的构造凹陷部位、与已知控矿背斜平行的次级隐伏背斜、白垩纪东河群下部、已知矿床两翼深部等部位是重要的找矿靶区和方向,应引起足够的重视。
Fengtai ore-concentrated area is an important part of the Pb-Zn-Au mineralization in Qinling area. The Pb-Zn deposits are mainly distributed in the western part of the ore-concentrated area,and can be divided into two ore belts:Qiandongshan-Shuibaigou Pb-Zn (Cu)ore belt in the south and Bafangshan-Baguamiao-Yinmusi Pb-Zn-Au ore belt in the north.Currently,it is discovered that the metallogenic regularity of trinity of “sedimentary facies + horizon + structure”can be applied to all the large and medium-sized Pb-Zn deposits in this area.It means that the exhalative hydrothermal sedimentation is an essential requirement of minerali-zation,and the contact zone and its periphery of Gudaoling Formation limestone and Xinghongpu Formation phyllite is the main ore-bearing horizon,and the NWW-trending folds and fractures are important ore-con-trolling factors.According to the regional metallogenic regularity,previous works of predecessors and sum-mary of field survey,the author believed that the important prospecting targets were extension parts of the strikes of known Pb-Zn deposits,pitching area of ore-controlling anticline of known deposits of low explora-tion degree,the structural depressed area between two Pb-Zn deposits which were controlled by the same anticline,secondary concealed anticline which was paralleled to known ore-controlling anticline,the lower part of Cretaceous Donghe Group,the deep part on both wings of the known deposits.More works should be done in these areas.
出处
《矿产与地质》
2016年第2期227-233,共7页
Mineral Resources and Geology
基金
国土资源部公益性行业科研专项经费课题(201111007-3)
"十二五"国家科技支撑计划项目课题(编号2011BAB04B05)资助
关键词
凤太矿集区
铅锌矿
成矿特征
成矿规律
找矿方向
Fengtai ore-concentrated area
Pb-Zn deposit
metallogenic characteristic
metallogenic regularity
prospecting direction
