四川会理县半山磁铁矿床地质特征及找矿方向

Geological Features and Range of Reconnaissance of the Bashan Magnetite Deposit in Huili,Sichuan

半山磁铁矿位于会理-会东铜、铁、铅、锌、金成矿带内。矿体赋存于前震旦系会理群力马河组第三段绿泥阳起片岩、绢云母石英片岩中,呈似层状、透镜状产出,受层位、岩性及构造控制。矿石主要为低品位磁铁矿。矿床属于变质热液型。矿区磁铁矿石品位低,但规模大、低硫、低磷,易采、易选。该文通过对矿床区域地质背景、矿区地质、矿体特征、矿石质量的分析,对矿床控矿因素、成因、找矿标志进行了讨论,认为该矿区成矿地质条件好,找矿潜力大,并提出了下一步找矿方向。

The Banshan magnetite deposit is located in the Huili-Huidong Cu-Fe-Pb-Zn-Au metallogenic belt.The orebodies occur as stratoid and lenticular form in chlorite-actinolite schist and sericite-quartz schist in the Third Member of the Limahe Formation of the Huili Group of the Pre-Sinian System and are controlled by the horizon,lithology and structure.The deposit belongs to metamorphic hydrothermal type.The ore is mainly composed of magnetite and characterized by low grade,low S,low P and easy to be mined and selected.The ore control factors,genesis and ore criteria of the deposit are discussed on the basis of which its range of reconnaissance is put forward.