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The Geological Characteristics, Ore-controlling Factors And Deposit Genesis Of The W-Mo Polymetallic Deposit In The South Of Huangshaping Mine, Hunan Province

Posted on:2012-10-24Degree:MasterType:Thesis
Country:ChinaCandidate:Z PanFull Text:PDF
GTID:2120330335489124Subject:Geological Engineering
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The W-Mo polymetallic deposit in the south of the Huangshaping mine of Hunan belongs to a part of ore band-301 of the Huangshaping mine. It is one of the important and potential deposits in this mine. According to the survey and research on the regional geological setting, the geological characteristics of the mine, mineralization geological condition, this paper mainly studies the deposit genesis and metallogenic law. The following are main contents:(1) The regional strata related to mineralization are mainly the Shidengzi group with impure carbonate and Ceshui group with sandstone and shale. The regional structures are the Baoling inverted anticline, near NS-direction faults of F1, F2, F3, and EW-direction fault of Fo. Igneous rocks exposed are mainly quartz porphyry, granitophyre, granite-porphyry and granite. Ore mineral assemblages are mainly composed of scheelite-molybdenite-magnetite-fluorite, and scheelite-molybdenite-fluorite. The ores have the granular, metasomatic, poikilitic, interstitial textures; and the massive-lump, banded, disseminated, thin veinlet or stockwork structures. Wall rock alteration types are composed of the fluoritization, silicification, chloritization, carbonation.(2) The igneous rocks mainly consist of hypabyssal quartz porphyry and concealed granitophyre, granite-porphyry and granite, which average SiO2 content is 73.22%, Na2O+K2O average of 8.0%, the ratio of K2O/Na2O much more than 1 (enriched with K2O), the Rittman index from 1.9 to 2.3(average of 2.1, belong to calc-alkaline-acidite magma).(3) The relationships were discussed between mineralization and strata-structure-igneous rock. The strata are helpful to the mineralization because of their favorite lithology, active chemical feather, good mineralization and storage space. The structures are the important control factors for the mineralization, which control the magma intrusion, rockbody and orebody formation and location. The Yanshanian early-phased granite porphyry should be strong related to the mineralization, and is the main resource rock of the mineral matter.(4) Abasing on the relationship of mineral paragenetic association, the mineralization of the W-Mo polymetallic deposit in the south of the Huangshaping mine can be divided into three stages and four phases.1) the skarn stage:early phase (garnet, hedenbergite, diopside etc); late phase (magnetite, scheelite, tremolite, epidote etc).2) Sulfide stage:early phase (chalcopyrite, pyrite, quartz, fluorite, etc); late phase (galena, sphalerite, quartz, calcite etc).(5) Metallogenic regularity were summarized, the results are that from intrusion to wall rock, the horizontal mineralization alteration banding are: W-Mo-Sn-Bi ore→Fe-W-Mo (Sn-Bi) ore→chalcopyrite→(Cu-Sn) Zn (Pb) ore→Pb-Zn (Ag)→Ag-Pb-Zn ore; vertical banding orders:in the shallow part the filling metasomatic galena-sphalerite-pyrite→in the upper-central part, skarn (Fe) sphalerite-galena-chalcopyrite-pyrite-arsenopyrite (associated Ag, Sn)→in the central part, skarn-type magnetite-tin-fluorite, skarn-type scheelite-molybdenite-magnetite→in the central-deep part, skarn-type scheelite-molybdenite-bismuthinite.(6) Based on the analysis of mineral source, ore-controlling factors, mineralization geological conditions, mineralization law and deposit's geological characteristics, this paper has established a comprehensive mineralization models. This W-Mo polymetallic deposit belongs to the skarn-type deposit—ontact metasomatism related to midium acidite magma.
Keywords/Search Tags:Mineralization geological condition, metallogenic regularity, deposit genesis, the W-Mo polymetallic deposit, Huangshaping
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