The Research Of Metallogenic Geochemistry Of Panhe Molybdenum Deposit In Eastern Qinling

Panhe molybdenum deposit in eastern Qinling is the research object in this thesis. Basedon the comprehensive analysis of the predecessors’ research achievements, fully carry out fieldgeological survey, collect related rock ore samples, with the aid of modern geologyexperimental analysis methods, determination of the rock ore samples of each componentcontent, system analysis the geological and geochemical characteristics of alaskites and quartzporphyries in mining area. On this basis, discussed the ore-forming substance sources andphysical and chemical ore-forming conditions, summarizes the new metallogenic model.Panhe granites belongs to high potassium and alkali calc-alkaline series, with highcontents of SiO₂（73.77%⁷6.25%）, K₂O（6.27%） and alkaline（9.70%）, and high ratio ofw（K₂O）/w（Na₂O）（3.45）, low contents of MgO （0.10%⁰.57%） and CaO（0.22%¹.56%）.Panhe granites exhibit a low amount of total rare earth elements（∑REE）; Eustrongly losses, is shown as extremely obvious negative Eu anomaly; Heavy rare earthelements（HREE） relative enrichment, the ratio of LREE/HREE and （La/Yb）_Nissignificantly lower than the norma l shell type granite, and the ratio of LREE/HREE isgenerally less than2,（La/Yb）_N¹,（La/Sm）_N¹,（Gd/Yb）_N¹; On the figure of CI chondritenormalized REE pattern, it appears to be a comparatively flat curve with “V”shape at Eu; Thisabnormal phenomenon is probably due to granitic melt in open system with rich volatile （F, Cl）fluid caused interaction.Trace elements of Panhe granites show that the content of large ion lithophile elements（LILEs：K，Ba and the others） is high. The elements with high field strength （HFSEs） indicatesthat some of them richer（Nb, Zr, Hf） and the others lower（Ti, P）. In addition, from rare earthelements to say, light rare earth elements （La, Ce, Nd） relative losses, and heavy rare earthelements （Tb, Y, Yb） relative enrichment. the figure of Eu-Sr show that in the Panhe granitesbelong to shell type granites, and contamination by mantle. Trace element research shows that the magmatic rocks in the enrichment of Mo isfar higher than flat wide group of stratum, and occurrence in the quartz porphyry veinsnear or in the quartz porphyry in the dike, instructions and quartz porphyry ore bodiesin space there is a close relationship, and can be suggested that enrichment of Mo frommagmatic rocks in this area; The range of the value of34S in Ore sulfides is small, anddiscrete small, tower effect obvious. These characteristics related to magmatis m of thehydrothermal deposit of sulfur isotope characteristics are the same, these instructionssulfur acid fro m deep source hypabyssal porphyry intrus ion; From the figure ofdifferent sources of hydrogen and oxygen isotopic normal distribution can be concludedthat the ore-forming fluid was most likely to be from magmatic hydrothermal; Theaverage uniform temperature of quartz inc lus ions is195.42℃, it can show that thequartz vein formed at low temperature in later stage of the ore-forming; Ore-forminghydrothermal salinity average is9.9%, moderate salinity; The quartz inclusionshomogenization pressure show that deposit formation depth is about770¹050m.Panhe molybdenum deposit with a dome structure within the frame of “stratabound”characteristics, mineralization is controlled by yanshan period magmatic hydrothermal activity.Not only is there the molybdenum mining area, there is also a copper-lead-zinc deposit,ore-forming solution after the formation of molybdenum ore body, the residual solution alongthe wall rock percolation migration, extraction copper-lead-zinc in the stratum at the sametime, in the molybdenum concentrate horizon on both sides of the low temperature region, theformation of symmetrical copper, lead-zinc mine.