| Yuanlin village molybdenum deposit is located in south of western Wuyi in Anyuan county of Jiangxi province. It is well known as wolfram-capital whose conditional is very favorable. Recent years, it has been found in this region that a number of huge reserves of molybdenum-based independent multi-metal deposits or molybdenum deposit. These molybdenum deposit, however, have been little studied and the forming of them have been explained by traditional Metallogenic mode. Molybdenum-based independent multi-metal deposits or molybdenum deposit, in fact, have their own unique characteristics. Our works focus on geological features and genesis of Yuanlin village molybdenum deposit.Based on the wild research, this paper focus on geological features and geochemistry. Then the paper investigate the time limitation of diagenetic mineralization, material source, the source region of porphyry mineralization, and diagenesis dynamic background. At last, we conclude the genesis type of molybdenum deposits, establish mode of Yuanli molybdenum mineralization and indicator of exploring molybdenum deposit.We make an conclusion as following:1. Yuanlin village molybdenum deposit belongs to porphyry molybdenum deposit. And molybdenum mineralization is closely related to Yanshanian Jurassic granite porphyry. Granite porphyry which is the main space of ore body extend as North West distribution, and it is 1000 meters long and 200 meters wide. The main structure of molybdenite in porphyry is stockwork, small veins, disseminated and so on. Area of mineralized belt is larger than area of rock mass. Porphyry deposit and quartz vein are main types and alteration zonation is significant.2. Geochemistry of rocks show that porphyry of Yuanlin village belongs to crust and mantle transition type granitic porphyry(I-S type). Metallogenic material mainly come from the crust, and they are contaminated by mantle material. Types of rock are high-K calc-alkaline series with high silica, alkali, Potassium, potassium> sodium, calcium and so on. REE distribution model of rock is right-wing-type with∑REE< 200×10-6, differentiation in light and heavy rare earth elements is not obvious withσEu negative anomalies and weak negative anomalies aCe. Metallogenic rock body is enrich in W,Sn, Mo,Bi,Cu,Pb and so on. Rocks depleted in HFSE, such as Ti,Nb,Ce,Zr,Hf and are enriched in LILE, such as U,Pb,P,K. Mo mineralization is closely related to strong potassicn and secondary silicification.3. After studying of zircon U-Pb isotopic and molybdenite Re-Os isotope, we conclude that age of granite porphyry in Yuanlin village is 162.8Ma, ore-forming age is 161.1±3.9) Ma, both of them belong to the Late Jurassic which is later than molybdenum deposit of same period. South China undergone the conversion of the principal stress field during this period in dynamics background.4. Studying of H, O, S, Re and Os isotope show that there are the same material sources between molybdenum deposit and Yuanling village porphyry. The material that comes from the crust is main metallogenic material with contamination by the material of mantle. |
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