湖南宝山铜铅锌多金属矿床成矿元素分带特征及地质意义  

Zoning characteristics of ore-forming elements and geological significance of Baoshan Cu-Pb-Zn polymetallic deposit in Hunan

作　　者：齐钒宇[1,2] 张志[1] 祝新友[3] 李永胜[1,4] 甄世民[1,4] 公凡影[1,4] 巩小栋[5] 

机构地区：[1]中国地质调查局发展研究中心,北京100037 [2]全国地质资料馆,北京100037 [3]北京矿产地质研究院,北京100012 [4]国土资源部矿产勘查技术指导中心,北京100120 [5]中国地质调查局成都地质调查中心,成都610081

出　　处：《矿产勘查》2017年第3期358-365,共8页Mineral Exploration

基　　金：全国危机矿山接替资源找矿项目(编号:20089927)资助

摘　　要：宝山铜铅锌多金属矿床位于我国南岭成矿带中段北缘,该矿床具有明显的水平分带性,即以花岗闪长斑岩为中心的铜钼矿化,周边是铅锌银矿化。成矿元素比值在垂向上也具有明显的分带性。Cu/Mo比值在花岗闪长斑岩岩体中呈现低值,在岩体上盘夕卡岩中值较高。Pb/Zn比值在宝山北部脉状矿体呈现下部比值低,向上比值逐步增高的特点。在宝山西部矿体中,一部分为下部比值高,上部比值低;另一部分为下部比值低,上部比值高,可能是由于测水组砂页岩盖层的影响,成矿热液部分被阻挡反向,向下运移成矿。推测宝山铜铅锌多金属矿床成矿热液运移主要通道为断裂构造,夕卡岩期成矿热液沿F_0断层上涌,硫化物期成矿热液沿F_(21)、F_(25)等断层上涌。宝山铜铅锌多金属矿床以铜钼矿与铅锌银矿为两个中心,表现为两个控矿构造,进而推测宝山铜铅锌多金属矿床铜钼矿与铅锌银矿形成于两个阶段。The Baoshan Cu-Pb-Zn polymetallic deposit located in the central Nanling mineralization zone,is an important poly- metallic deposit type. The Baoshan deposit has obvious horizontal mineralization zoning, i.e., Cu-Mo mineralization in the center of por- phyritic granodiorite intursion to Pb-Zn-Ag mineralization in the periphery area. Also, there is obvious vertical zoning of ore-forming ele- ment ratio.The Cu/Mo ratio is low within granodiorite porphyry and extremely high in endoskarn, the hanging wall of the intrusion.The Pb/Zn ratio is low in the lower part and increasing higher in the upper part of vein ore bodies in the northern area.However, in the west- ern mining area,the distribution of Pb/Zn ratio varied in vein ore bodies, i.e., the ratio is low in the lower part of some vein bodies and high in the lower part within other vein ore bodies, which can be explained by the cover effect of sandstone shale of Ceshui formation that blocked the ore-forming fluid upward and forced to move downward and deposited in the bottom part.Thus, it was inferred that the fault structure is the main movement channel of ore-forming hydrothermal fluid. During the skarn metallogenic period, the ore-bearing hydro- thermal solution rises through the F0 fault while through F21and F2s faults in the sulfurization period. Therefore, there are two mineraliza- tion centers in the deposit area, i.e., Cu-Mo mineralization center and Pb-Zn-Ag mineralization center which were controlled by differ- ent structures.So there are two periods of mineralization, i.e., Cu-Mo mineralization and Pb-Zn-Ag mineralization periods.

关 键 词：成矿元素 宝山 铜铅锌多金属矿 湖南 

分 类 号：P618.41[天文地球—矿床学] P618.42[天文地球—地质学]