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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 >Geology and Origin of the Vanadiferous Fe-Ti Oxide-rich Kennedy's Vale Discordant Body, Eastern Limb of the Bushveld Complex, South Africa
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Geology and Origin of the Vanadiferous Fe-Ti Oxide-rich Kennedy's Vale Discordant Body, Eastern Limb of the Bushveld Complex, South Africa

机译：富含钒Fe-Ti氧化氧化物的地质和起源的Vale不和谐的身体，南非的Bushveld Complex的东部肢体

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The 2055 Ma Bushveld Complex, South Africa, is well known for the occurrence of discordant bodies within the Rustenburg Layered Suite (RLS). Many discordant bodies disrupt mining of layered reefs, but a few have been successfully exploited, including the well known platiniferous dunite pipes. The Kennedy's Vale discordant body, situated in the Steelpoort Valley section of the Eastern Limb, has been almost entirely mined out for a central core of vanadium-rich Ti-magnetite. Discordant bodies are particularly abundant in this area which is severely disrupted by syn-Bushveld doming and faulting. The three-dimensional shape of discordant bodies in the RLS is highly variable, most are pipe-like, but Kennedy's Vale is unusual in that it constitutes an elongate, dyke-like body. The Kennedy's Vale occurrence is emplaced within gabbroic-anorthositic wall rocks of the Lower Main Zone, at a stratigraphic height of several thousands of metres below the Ti-magnetite layers. A broad zonation is recognised and the central core of massive Fe-Ti oxides is enclosed by an inner sheath of iron-rich wehrlite pegmatite and an outer sheath of iron-rich clinopyroxenite pegmatite. The sheath contains disseminated Fe-Ti oxides. An irregular and diffuse reaction rim has been identified between the outer sheath and thewall rocks. Kennedy's Vale is part of the iron-rich ultramafic pegmatite (IRUP) group of discordant bodies, highly unusual rocks characterised by the absence of plagioclase and being more differentiated than the wall rocks in which they are emplaced. The composition of the olivine in the outer sheath at Kennedys' Vale (Fo_(49.6-46.5)) is typical of the IRUP at this stratigraphic height, but considerably more differentiated than the pyroxene in the wall rocks. The reaction rim to the dyke includes relic grains of extremely calcic plagioclase and symplectites, indicative of high-temperature reactions. Symplectites formed due to reaction between the primocrysts in the gabbroic wall
机译：南非2055马·布什维尔德综合体众所周知，众所周知，刚果堡分层套房（RLS）内的不间断形式的体。许多不和谐的机构扰乱了分层珊瑚礁的挖掘，但是已经成功开发了一些已知的众所周知的Platinifore Dunite管道。肯尼迪的Vale不间断的身体位于东部肢体的SteelPoort谷段，几乎完全挖掘了富含钒的Ti-Magnetite的中央核心。不和谐的身体在这一领域特别丰富，这是由Syn-Bushveld Doming和Failling严重破坏的。 RLS中不间断的体内的三维形状是高度变化的，大多数是管道，但肯尼迪的谷物是不寻常的，因为它构成了一个细长的堤状体。肯尼迪的Vale发生在下部主区的Gabbroice-Andorthyic壁岩内被置于下部的地层高度，在Ti-磁铁矿层下方数千米处。识别宽分区，并由大规模Fe-Ti氧化物的中央核心由铁富龙铁矿石岩的内部护套和铁富含氯纤维的外鞘包围。护套含有散发的Fe-Ti氧化物。在外护套和壁岩之间识别不规则和漫反应轮辋。肯尼迪的Vale是富含铁的Ultramafic Pegmatite（IRUP）不间断的体系组的一部分，高度不寻常的岩石，其特征在于没有Plagioclase的缺失，并且比它们被施加的壁岩更差异化。在肯尼迪谷的外护套中的橄榄石的组成（FO_（49.6-46.5））是这种地层高度的典型IRUP，但比壁岩中的虹己相当差异。对堤的反应外缘包括极其钙化型普拉基酶和辛酸酯的遗物晶粒，指示高温反应。由于八溴壁中的PrimoCrysts之间的反应而形成的ysplectites

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