甘肃省肃北县M674铁铜矿地质特征及找矿标志浅析

GEOLOGICAL CHARACTERISTICS AND PROSPECTING OF M674 IRON-COPPER DEPOSIT IN SUBEI COUNTRY, GANSU PROVINCE

矿区地处甘肃北山地区。出露地层有石炭系、二叠系、三叠系、及第四系,侵入岩主要为华力西期和印支期,其中华力西期的辉长岩与本区磁铁矿有着密切的关系。根据矿体的空间分布位置,矿区内圈出了2个矿化带(Ⅰ、Ⅱ),共8条磁铁矿体。区内辉长岩、花岗岩岩体侵入发育地段是该区成矿的主要标志,断裂构造破碎带是区内明显的找矿标志,区内磁铁矿化蚀变发育地段更是重要的找矿标志。矿区磁铁矿体的主要含矿岩性为磁铁矿化辉长岩,磁铁矿化、黄铁矿化辉长岩,主要蚀变为磁铁矿化、黄铁矿化,局部可见孔雀石化等。磁铁矿体多呈脉状、透镜状赋存于辉长岩的接触带及东西向的断裂破碎蚀变带中。

The mine area is located in Beishan area, Gansu province. The strata outcropping on the Beishan area include the Carboniferous, Permian, Triassic, and Quaternary. The intrusive rocks are mainly formed during the Hercynian and indochina periods, and the gabbro of Hercynian is closely related to the magnetite in this area.According to the spatial distribution of the ore body, we recognized two mineralized zones（ Ⅰ, Ⅱ） and eight magnetite bodies in the mining area. The section that gabbro and granite intruded is the mainly sign of the mineralization, the faulted tectonic zone is a significant prospecting indicators, and the region of magnetite mineralization-alteration is an important prospecting indicator in the area. The main ore-bearing rocks of the magnetite are magnetite mineralized gabbro, magnetite mineralization, pyrite mineralized gabbro, and main alteration is magnetite mineralization, pyrite mineralization, local visible petrochemical mineralization. The magnetite are hosted in the contact zone of the gabbro and the east-west fracture zone with veined and lenticular forms.