川西盐边县红格钒钛磁铁矿中镍钴硫化物的铂族元素地球化学特征
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本文为国家自然科学基金资助项目(批准号:41073022)的成果。


PGE Geochemical Characteristics of Massive Sulfide in V—Ti magnetite at Hongge area in Western Sichuan Yanbian County
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    摘要:

    世界上尚未发现过V—Ti磁铁矿和硫化物矿床共生,在川西延边县红格矿床,原认为在矿体底部存在一个富含PGE、Cr的层位,但我们在多个钻孔中取样分析,均未发现。然而我们发现在红格矿床百草矿段存在大量的块状硫化物矿体,硫化物贯入铁矿后,可叠加形成镍—钴—铁矿体。块状硫化物矿石主要成分为磁黄铁矿(94%)、镍黄铁矿、黄铜矿,少量普通辉石、次透辉石、古铜辉石、普通角闪石、金云母、磁铁矿、钛铁矿、中长石等。其中Ni 0.72%~0.90%,Co 0.10%。主要赋存在磁黄铁矿中。通过铂族元素分析发现,块状硫化物(磁黄铁矿)Cu/Pd为12908~15109, 含硫化物3%的贯入式铁矿Cu/Pd为24520。Cu/Pd比值远高于原始地幔值,暗示有少量硫化物在岩浆源区的残留。同时,在铁矿形成之前已发生过硫化物的熔离。红格地区样品的Pd/Ir值变化范围为2.8~30主要集中在8~14附近,可见红格地区经历过很强的岩浆结晶作用。红格矿床的PGE元素已发生明显的分异现象,暗示硫化物与铁可能在流体中有共同富集的情况。不同矿段的PGE含量有明显差异,很难用一个岩浆房进行解释,可能是多级岩浆房岩浆演化的产物。暗示深部还有岩浆房,在地下深处,还可以找Ni—Cu—PGE和Fe—Ti—V矿床。

    Abstract:

    The paragenesis phenomenon between V—Ti magnetite deposits and sulfide deposits has not yet been found all over the world. Although it was deemed a PGE—Cr enriched layer in the bottom of the ore body at Hongge deposit, the consequence by analyzing lots of drilling samples is not really as the prior viewpoint in Hongge mining area which is in the west of Sichuan province. However, we find the existence of a large amount of massive sulfide deposits ore which can form Fe—Co—Ni paragenetic orebody after piercing into iron orebody in Baicao mining area in at Hongge deposits. The major compositioningredients of massive sulfide ores are pyrrhotite (94%), pentlandite and chalcopyrite, and a few ingredients of augite, sahlite, bronzite, hornblende, phlogopite, magnetite, ilmenite, and andesine, etc. The tenoramount of Ni is 0.72%~0.90%, while the tenoramount of Co is about 0.10%. These two elements mainly exist in the pyrrhotite. The experimental analysis of Platinum Group Elements indicates that the Cu/Pd ratio is between 12908 and 15109 in massive sulfides, while it is about 24520 in iron ore with 3% penetrated sulfide. These Cu/Pd ratios are much higher than primitive mantle source value which implies the tiny amounts of sulfide residue in magmatic source. Meanwhile, sulfide phase separations have of the sulfide occurred before the iron ore form. In Hongge area, Pd/Ir ratios of samples ranging from 2.8 to 30, mainly concentrated between 8 and 14, suggestshow it might experience a strong magmatic crystallization. An obvious fractionation phenomenon of Platinum Group Elements in Hongge deposit suggests that sulfide deposit and iron may accumulate simultaneously in fluid. It is difficult to explain the obvious differences of PGE contents by the same magma chamber among different mining areas which can be the product of magmatic evolutions in multistage magma chambers. It may imply that there is awill be a subsurface magma chamber where exists Ni—Cu—PGE deposits and Fe—Ti—V deposits in deepth.

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张腾蛟,李佑国,张月姣,赵伟.2017.川西盐边县红格钒钛磁铁矿中镍钴硫化物的铂族元素地球化学特征[J].地质论评,63(4):1050-1063,[DOI].
ZHANG Tengjiao, LI Youguo, ZHANG Yuejiao, ZHAO Wei.2017. PGE Geochemical Characteristics of Massive Sulfide in V—Ti magnetite at Hongge area in Western Sichuan Yanbian County[J]. Geological Review,63(4):1050-1063.

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  • 收稿日期:2016-05-19
  • 最后修改日期:2017-05-14
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  • 在线发布日期: 2017-07-13
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