河南方城维摩寺沉积改造型铅锌银矿床特征及成因模式  

Characteristics and metallogenic model of Weimosi sedimentary-reworked Pb-Zn-Ag deposit in Fangcheng of Henan

作　　者：刘亚南[1] 罗明伟[2] 金辉[2] 董晓荣[2] 敬克甲[2] 孔德成[2] 杜春阳[2] 

机构地区：[1]河南省地质矿产勘查开发局第四地质勘查院,河南郑州450001 [2]河南省地质矿产勘查开发局第二地质勘查院,河南许昌461000

出　　处：《矿产与地质》2015年第4期479-483,共5页Mineral Resources and Geology

摘　　要：维摩寺沉积改造型铅锌银矿床位于秦岭褶皱系北部"裂陷槽"内。矿区新元古界陶湾群,岩性主要为结晶灰岩、白云质结晶灰岩,次为绢云母石英片岩;主要矿体赋存于陶湾群缓结晶灰岩倾斜岩层中,特点是厚而偏贫。矿体形态为豆荚状、透镜状;陶湾群部分地层本身既是矿源层又是矿体;由于矿源层于是碳酸盐岩系列岩石,其矿物颗粒间受区域变质作用发生重结晶而使孔隙明显增大,加上众多细小的岩溶孔隙,使得后期含矿热卤水的运动通道通畅,对矿源层的有用元素进行渗透、淬取、溶解,最后冷却、充填、沉淀在矿源层中形成矿床。Weimosi sedimentary-reworked Pb-Zn-Ag deposit is located in the ＂chasmic trough＂ of northern Qinling fold system. This mining area belongs to Taowan Group of Neoproterozoic era, and the lithology is mainly crystalline limestone and dolomitic crystalline limestone, with lesser sericite-quartz schist. The main ore bodies occur in the gently inclined crystalline limestone strata of Taowan Group, and are characterized by thick width and relatively low grade. The orebodies occur as pod or lenticular in form. Some strata of Taow- an Group are both the source beds and the orebodies. The source beds, are rocks of carbonate series, and the pore size increases significantly because the mineral particles suffer from the recrystallization resulted from regional metamorphism. With numerous small karst pores, ore-bearing hot brine thus is provided with unob- structed movement channels in the later period, and finally forms the deposits in the source beds through its effects of permeating, extracting and dissolving as well as cooling-down, filling-in and precipitating on useful elements in the source beds.

关 键 词：铅锌银矿床 沉积改造 矿源层 找矿标志 

分 类 号：P618.4[天文地球—矿床学] P618.52[天文地球—地质学]