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丰羽矿床最显著的特征是产有稀有金属Sn、Zn、W、Co、Ni、Bi、Se、Te、Ga、V等。该矿床具有两期矿化,晚期矿化又分为五个连续的次级阶段A、B、C、D、E。矿石的电子探针分析和镜下观察表明,稀有金属是从次阶段B的成矿溶液中沉淀的。金属是由于热液流体与其周围的天水成因的地热水相混合而发生沉淀的。稀有金属的矿化作用,其初始热液流体的温度为400℃,含盐度为5～7%,fo_2低于磁黄铁矿上限,fs_2位于磁黄铁矿和黄铁矿界限附近,这些数据均与流体包体数据和矿物组合相一致。成矿溶液演化趋势和晚期脉中产出的Sn和In表明,晚期矿化作用来自钛铁矿系列的花岗石类岩浆,而早期阶段的矿化作用则来自磁铁矿系列岩浆。年代学数据,矿物带状分布、金属品位,流俸包体及活动地热流体的流量表明,成矿溶液来自无意根山(Mnineyama)安山岩下的一套潜伏侵入体。
The most significant feature of the Fengha deposit is the production of rare metals Sn, Zn, W, Co, Ni, Bi, Se, Te, Ga, V and the like. The deposit has two stages of mineralization, and late mineralization is divided into five consecutive secondary stages A, B, C, D and E. Electron probe analysis and microscopic observation of the ore showed that the rare metal was precipitated from the secondary stage B ore-forming solution. Metals are precipitated by the mixing of hydrothermal fluids with the geothermal water of the Tianshui Formation that surrounds them. The mineralization of rare metals, the initial hydrothermal fluid temperature is 400 ℃, salinity of 5 to 7%, fo_2 lower than the upper limit of pyrrhotite, fs_2 located pyrrhotite and pyrite near the boundaries of these Data are consistent with fluid inclusions data and mineral assemblages. The evolution trend of ore-forming solution and Sn and In produced in late vein show that the late mineralization comes from the granite magma of the ilmenite series, while the mineralization of the early stage comes from the magmatic series magma. The chronological data, mineral zonal distribution, metal grade, flow envelope and active geothermal fluid flux indicate that the ore-forming solution came from a set of latent invaders beneath the Mnineyama andesite.