| 河北金家庄金矿床矿物化学及金银赋存状态研究 |
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| 引用本文：.1995.Mineralogical chemistry and modes of occurrence of gold and silver in the Jinjiazhuang gold deposit, Hebei Province[J].Mineral Deposits,14(4):355~361 |
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| 中文摘要:河北金家庄金矿是一产在透辉石岩体中的矿床。本文用多种方法对该矿床中的主要矿石矿物进行了矿物化学、矿物标型和金、银赋存状态等方面的研究。不仅发现了含铂、钯的黄铜矿和闪锌矿，而且还找到了针镍矿。为探讨此金矿床的成矿特点提供了一些矿物学依据。 |
| 中文关键词:超基性岩型金矿 矿物化学 金银赋存状态 河北金家庄 |
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| Mineralogical chemistry and modes of occurrence of gold and silver in the Jinjiazhuang gold deposit, Hebei Province |
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| Abstract:The Jinjiazhuang gold deposit is located in the transitional belt between Inner Mongolia geoaxis and Yanshan subsidence zone on the northern margin of North China platform. Orebodies mostly occur in fractural shatter zones within Xiaozhangjiakou altered diopsidite body. Gold ores are mainly of shattered altered rock type and subordinately auriferous quartz veins. The shattered altered rock type ores have rather complex mineral assemblage: besides large quantities of metallic sulfides and oxides (pyrite, galena, sphalerite, chalcopyrite and magnetite), there are commonly carbonae minerals (smithsonite, cerussite and thodochrosite). Millerite was also found in this deposit. X-ray diffraction analyses show that unit cell parameters of pyrite ( a0 =5.424 ~ 5.431 A this gold deposits is obviously larger than the theoretical value (a0 = 5.417 A) and its unit cell parameters in other types of gold deposits (a0 = 5.417 ~ 5.418 A ). The unit cell parameters of galena(a0 = 5.037～ 5.491 A ) are slightly smaller than the standard value. Chemical analyses of individual minerals indicate that gold content of major minerals seems very low, being 0.06×10-9～0.35×10-9 in pyrite and 0.1×10-9 in galena. This suggests that gold in ores rarely enters crystal lattices, and occurs mainly in the form of independent minerals, such as electrum and native gold. With the help of electron microprobe analysis, the author not only detected millerite, but also found that platinum group elements are extremely abundant in chalcopyrite ( Pt = 0.65% ~ 3.l%, Pd = 0.09%～ 0.44%). All these characteristics may show some relationship with diopsidite. |
| keywords:gold deposit associated with ultrabasic rocks, mineralogical chemistry, modes of occurrence of gold and silver, Jinjiazhuang of Hebei Province |
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