陕西金堆城钼矿床中铁钼华的矿物学特征及其意义
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Mineralogical Characteristics of Ferrimolybdite from the Jinduicheng Molybdenum Deposit in Shaanxi Province and Its Significance
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    摘要:

    铁钼华产于陕西金堆城斑岩钼矿床的氧化带内,该矿物以往被认为是钼华。笔者对该矿物进行了物理光学性质、化学成分、X射线衍射、穆斯堡尔谱、红外光谱以及失重和差热分析的研究,定名为铁钼华,其分子式为Fe2(MoO4)3·6.8H2O。同时,将其与国外天然和人工合成的铁钼华作了对比,确定其是在酸性氧化环境中形成的次生矿物。它是原生钼矿床的直接找矿标志。

    Abstract:

    Ferrimolybdite hasbeen found in the oxidized zone of the Jinduicheng por- phyry molybdenum deposit, Shaanxi province. The mineral occurs as bundles of fine fibers and encrustations in fissures of weathered rocks and molybdenite- bearing quartz veins, In surface exposures, the mineral is associated with. quartz, limonite, goethite and jarosite; in hand specimen, it occasionally co- retains residue of molybdenite and grades into surrounding limontie, The ferrimolybdite has been studied by such means as physical and optical exa- urination, chemical analysis, X-ray diffraction, Mossbauer spectra, IR spe- ctra, TG and DTA. The formula of the mineral is Fe2(Mo04)3.6.8H20, in which. iron is proved to be all in the form of Fe3+ by Mossbauer spectra, X-ray diffraction patterns of the mineral are comparable with those of syn- thetic ferrimolybdite (Kerr, P.F.et al.,1963) but show more reflection lines than other naturally occurring ferrimolybdite. According to geological environment and related mineral association of ferrimolybdite and conditions for forming synthetic ferrimolybdite as well as Titley 's experimental results, it is considered that formation and stabi- lity of the mineral are probably coatorlled by acid oxidized environment, and the presence of molybdenite and pyrite yields molybdenum and iron neces- sary to the formation of supergene ferrimolybdite. Although ferrimoiybdite fails to form supergene enrichment economic va- lue in this molybdenum deposa, it remains an indicator mineral in search for primary molybdenum deposits.

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黄典豪,1989,陕西金堆城钼矿床中铁钼华的矿物学特征及其意义[J].岩石矿物学杂志,8(4):352~360. Huang Dianhao,1989,Mineralogical Characteristics of Ferrimolybdite from the Jinduicheng Molybdenum Deposit in Shaanxi Province and Its Significance[J]. Acta Petrologica et Mineralogica,8(4):352~360.

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