广东大宝山钼钨多金属矿床成矿系统与找矿预测

The matallogenic system and the prognosis,Dabaoshan Mo-Cu-Pb-Zn deposit,Guangdong province

广东大宝山铁多金属矿床发育大规模的铁、铜铅锌矿,近年来危机矿山深部找矿项目取得重大进展,在花岗斑岩体顶部发现具有超大型远景的斑岩型钼矿化。铁矿为风化淋滤堆积型,有色金属矿成矿与岩浆热液作用有关。通过重新厘定侵入岩岩性,建立了大宝山斑岩矿床成矿系统,指出成矿地质体为花岗斑岩,以钼钨矿化为成矿中心,向外围逐渐发育夕卡岩型钼矿、脉型铜矿、铜铅锌矿、铅锌矿、铅锌银矿,最远端是脉状菱铁矿。探讨了矿床成矿深度与剥蚀水平,斑岩系统成矿空间的总垂深超过2 000 m,地表以下深部成矿深度>1 500 m(不包括后期断裂破坏)。除大宝山花岗斑岩体钼矿化边界向东侧扩大外,指出大宝山矿床下一步重点找矿方向包括:①被逆冲断裂破坏的大宝山成矿斑岩体下半部分;②大宝山斑岩体的北北西方向;③船肚岩体的斑岩型与夕卡岩型。

The Dabaoshan polymetallic deposit containing aboundant copper, lesd and zinc mineral resouces. A significant process is that porphyry W - Mo mineralizaton system was discovered ,with huge - scale prospective on top of the granite - porphyry, Iron deposit is weathering and leaching type one. Nonferrous metals mineralization is associated with magmatic hydrothermal process. It is established that the Daobaoshan porphyry metallogenic system,which granite porphyry is the ore -forming intrusion, Mo -W deposit occurred in the ore - forming center, with skarn - type Mo, vein - type Cu, Cu - Pb - Zn, Pb - Zn, Pb - Zn - Ag, and siderite veins gradually far away from this center. It is studied that the ore - forming depth and erosion level. The depth of the porphyry - type metal- logenic system is more than 2000 meters, and that of erosion is more than 1500 meters （not includes that destroyed by fault）. The important prospecting target shonld include three aspects ： 1 ） Beyond the eastern boundary of the porphyry Mo mineralization system ; 2） the other side of the porphyry Mo deposit under the fault; 3） NNW area of the porphyry, and porphyry type and skarn type Mo - W deposits around Chuandu intrusion.