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首页> 外文会议>International nickel symposium >PGE rich 2.45 Ga mafic dykes in Northern Finland:implications for the origin of PGE mineralization in the associated layered intrusions
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PGE rich 2.45 Ga mafic dykes in Northern Finland:implications for the origin of PGE mineralization in the associated layered intrusions

机译：PGE RID 2.45芬兰的GA MAFIC DYKES：对PGE矿化在相关的分层入侵中的起源的影响

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The Karelian craton contains abundant 2.45 Ga mafic dykes that are spatially and temporally related to PGE-mineralized mafic-ultramafic layered intrusions.The mafic dykes include boninites,cumulate textured gabbronorites,Ti-poor tholeiite and Fe-tholeiite.The Nd isotope and trace element geochemistry of the mafic dykes suggests that the tholeiites are derived from a depleted asthenospheric mantle,partially molten in a mantle plume,followed by different degrees of crustal contamination.The mantle source of the boninites and gabbronorites is less clear;They are variably and often highly enriched in incompatible trace elements and have negative εNd (-1 to -3),suggesting either relatively enhanced crustal contamination,or a mantle source in the metasomatised sub-continental lithospheric mantle.Most dyke types show a trend of high Pt and Pd abundances and mantle-like Cu/Pd ratios in the more primitive members,suggesting sulphide undersaturation both at the source and en route to the surface.Sulfide saturation was achieved in the more evolved magmas,and in many cases the sulfides were entrained by the magma,resulting in high Cu and PGE contents,creating some of the world’s most PGE rich basalts.The data indicate that all 4 dyke types are prospective for PGE mineralization.
机译：卡累利阿克拉通包含在空间和时间上与PGE矿化镁铁质 - 超镁铁质层状intrusions.The镁铁质堤坝包括boninites丰富2.45镓镁铁质堤坝，累积纹理gabbronorites，拉斑的Ti-差和Fe-tholeiite.The钕同位素和微量元素镁铁质堤坝的地球化学表明拉斑玄武岩从耗尽的软流圈地幔，部分地以地幔柱熔融，随后不同程度boninites和gabbronorites的地壳contamination.The地幔源的不太清晰;它们是可变地且通常高度富集不相容微量元素和具有负的εNd（-1至-3），提示无论是相对地提高地壳污染，或在metasomatised次大陆岩石圈mantle.Most堤防类型地幔源显示出高的Pt和Pd丰度趋势和地幔样既在源和途中表面在更原始部件的Cu /钯比例，暗示硫化物欠饱和.Sulfide饱和度在更进化的岩浆实现，并且在许多情况下，硫化物是由岩浆夹带，导致高Cu和PGE内容，创造了一些世界上最丰富的PGE数据basalts.The的表明，所有4种堤坝类型前瞻性的PGE矿化。

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