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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >Cryptic mineral variation and PGE distribution in the Merensky Reef and its discontinuous mela-gabbronoritic hanging wall (“Brown Sugar Norite” - BSN) at Two Rivers Platinum Mine, Eastern Bushveld Complex, South Africa
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Cryptic mineral variation and PGE distribution in the Merensky Reef and its discontinuous mela-gabbronoritic hanging wall (“Brown Sugar Norite” - BSN) at Two Rivers Platinum Mine, Eastern Bushveld Complex, South Africa

机译：Merensky Reef中的隐秘矿物变异和PGE分布及其不连续的Mela-Gabbronoritic悬挂墙（“棕色糖Norite” - BSN），在两条河铂矿，东部Buldveld复杂，南非

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Two Rivers Platinum Mine, situated on the southern sector of the eastern limb of the Bushveld Complex, extracts Platinum Group Elements (PGE) from the UG-2 chromitite layer. A trial operation of the Merensky Reef (MR) exposed unusual occurrences of mela-gabbronoritic lenses, ‘brown sugar norite’ (BSN in mine terminology), within the pyroxenite of the hanging wall. The BSN is a fine-grained mela-gabbronorite, which appears to only occur where the upper chromitite stringer of the Merensky Reef unit is present, and forms laterally inconsistent, flat lenses. Textural features, mineral chemistry of the various rock types, Sr analyses of plagioclase separates and whole rock geochemistry indicate multiple magma injections, fractionation and disequilibrium crystallization of the magma within the Merensky interval. Whole rock MgO and enstatite content of orthopyroxene are higher in BSN compared with the surrounding Merensky Reef pyroxenite, thus supporting the notion of the BSN having formed from a more primitive magma. Both the pyroxenite and BSN plagioclase have ~(87)Sr/~(86)Sr ratios representative of Critical Zone magma; that of the BSN has a lower initial ~(87)Sr/~(86)Sr isotope ratio relative to that of the pyroxenite, suggesting a more primitive magma source. It is suggested that the unusual, discontinuous BSN lenses within pyroxenite may have formed by magmatic erosion of a new magma injection, which affected the crystal mush of the earlier deposited BSN layer. This resulted in isolated lenses of relict, but more primitive orthopyroxene of the BSN in a residual plagioclase-rich melt from an earlier pyroxenitic MR magma. In both rock types (MR pyroxenite and BSN), the PGE occur as discrete platinum-group minerals (PGM), and in solid solution in sulphides. At Two Rivers Platinum Mine, the presence of PGE in sulphides has been identified by EMPA and LA-ICP-MS. The PGE occur mineralogically either in solid solution or as PGM inclusions of different size. Pentlandite, c
机译：两条河流铂金矿位于蒲式德尔德复合体的东部肢体的南部部门，从UG-2铬酸盐层中提取铂族群元素（PGE）。 Merensky Reef（MR）的试验运作（MR）暴露了悬挂墙的Pyroxecite内的Mela-Gabbronoritic镜片，“棕色糖Norite”（Brows Norite'（BSN）的异常出现。 BSN是一种细粒颗粒 - Gabbronorite，其似乎仅发生在存在Merensky Reef单元的上铬锭器的情况下，并且形成横向不一致的平透镜。纹理特征，各种岩石类型的矿物化学，SR分析Plagioclase分离和整个岩石地球化学指示岩浆内部岩浆内部的多重岩浆注射，分馏和不平衡结晶。与周围的Merensky Reef Pyroxenite相比，BSN的整个岩石MgO和尚盐酸盐含量较高，因此支持由更基本的岩浆形成的BSN的概念。 Pyroxenite和BSN Plagioclase都具有〜（87）SR /〜（86）SR比率代表临界区岩浆; BSN的初始〜（87）SR /〜（86）SR同位素比率相对于曲十的初始〜（87）SR /〜（86）比，表明更原始的岩浆源。建议在碧宝石中的不常用，不连续的BSN透镜可以通过新的岩浆喷射的岩浆腐蚀形成，这影响了较早沉积的BSN层的晶体糊状物。这导致分离的镜片依赖于较早的辉石体MR岩浆中的残留的普通粘接酶的BSN中的依赖性晶状体。在岩石类型（Pyroxenite和BSN MR）中，PGE作为离散铂 - 群矿物（PGM）和硫化物的固溶体发生。在两个河流铂矿，通过EMPA和La-ICP-MS鉴定了硫化物珠肽的存在。 PGE在固体溶液中或作为不同尺寸的PGM夹杂物发生矿物质。 Pentlandite，C.

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