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Geology, Geochemisty and Metallogenesis of the Yuchiling Porphyry Molybdenum Deposit, Western Henan Province

Author: ZhouZuo
Tutor: MaoJingWen；YeHuiShou
School: Chinese Geology University (Beijing)
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: The fish pond Ridge molybdenum deposit Heyu granite Geochemistry Ore-forming fluids Porphyry molybdenum deposit
CLC: P618.65
Type: Master's thesis
Year: 2008
Downloads: 131
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Abstract


Western Henan the fish pond Ridge molybdenum mine in recent years in our East Qinling molybdenum belt newly discovered giant porphyry molybdenum deposit. Molybdenum deposit produced in Heyu duplex granite body and hidden breccia. In this paper, the Heyu granite petrology, geochemistry and geological characteristics of the fish pond Ridge molybdenum deposit, fluid inclusions, stable isotopes, and chronology system, to further identify the characteristics of Hop Tongkuangyu granite body, genetic type, reveals into type of ore fluid, formation conditions and possible sources to obtain accurate diagenetic mineralization age, and explores the genesis. The main results achieved and understanding as follows: the granite main part Heyu three-invasive body composition, rock type is mainly biotite monzogranite. The intrusive rock mineral composition is basically the same structure mainly porphyritic structure. Increasing trend from early to late, K-feldspar phenocrysts and biotite content. Hop valley granite belonging to the silicon-rich in the chemical composition of the whole rock, K calc-alkaline series of alkali-rich; A / CNK value of 0.92 to 1.04, with an average of 0.995 weakly peraluminous granites. The rocks are enriched in LREE, loss HREE; weak negative Eu anomalies, and light and heavy rare earth elements strongly fractionation, enrichment of large ion lithophile elements, high field strength elements loss characteristics, suggesting that the source region of magma exists plagioclase hornblende garnet rutile The phase separation of crystalline or remaining in the source region. Rock characteristics of I-type granites, magmatic material sources for the next shell source mantle material added. Use of LA-MC-ICP-MS zircon U-Pb dating of the granite body Heyu dating, the three magma intrusion crystallization age of 133.06 ± 0.63Ma, 133.53 ± 0.61 Ma, 132.85 ± 0.60Ma. Pluton Zr saturation temperature of 758 ~ 805 ℃, an average of 783 ° C, represents the formation of granite magma temperature; Sr / Yb ratio indicating the formation pressure for high pressure magmatic origin depth is about 50km. Hydrothermal alteration of the type of fish pond Ridge molybdenum mine K-feldspar, biotite, sericite, pyrite phyllic of silicification, epidotization, chlorite and kaolin so; mineralization type disseminated, fine vein, stockwork, film-like pancake. The main mineralization can be divided into four stages of mineralization: (1) K-feldspar stage; (2) quartz - molybdenite stage; (3) quartz - polymetallic sulfide stage; (4) quartz - carbonate stage. The deposit has the characteristics of typical porphyry molybdenum ore. Fluid inclusions are divided into five categories: gas-liquid two-phase inclusions (I type), with CO2 phase inclusions (II type), CO2 inclusions (III type), pure aqueous solution phase inclusions (Ⅳ) and containing stone salt sub-crystal three-phase inclusions (Ⅴ type). The main mineralization stage temperature of 250-310 ℃, salinity w (NaCleq) 4.18 ~ 8.55 wt% NaCleq average pressure is 258.15 × 105Pa depth of 0.956 km. Ore-forming fluid vapor component in addition to H2O, CO2 content is also high, also contains trace amounts of CH4, C6H6, reducing gas. Restore parameter (CH4 C6H6/CO2 O2) higher (0.18 to 0.34), and to reveal relatively restore the environment, fluid H2O-NaCl-CO2 system characteristics. H, O isotopic composition of the source of the ore-forming fluids is likely for the the magma water and atmospheric water mixed. The sulfur isotopic composition from the deep. The fish pond Ridge molybdenum mine mineralization Age (131.2 ± 1.4) Ma, diagenetic mineralization Early Cretaceous of mineralization Heyu pluton magmatic activity is closely related to the product should be the same structure - magma - fluid activity. The deposit was formed in extensional tectonic environment, the corresponding tectonodynamics background region of lithospheric thinning, delamination and thermal erosion.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Rare metals and a small amount of metal > Molybdenum
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