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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 >Petrology, geochemistry and fluid inclusion analysis of altered komatiites of the Mendon Formation in the BARB4 drill core, Barberton greenstone belt, South Africa
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Petrology, geochemistry and fluid inclusion analysis of altered komatiites of the Mendon Formation in the BARB4 drill core, Barberton greenstone belt, South Africa

机译：Barberton Greenstone Belt，南非孟顿钻孔改变蒙文岩层改变Komatiens的岩石学，地球化学和流体包容性分析

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摘要

The 3.33 to 3.26 Ga Mendon Formation in the Palaeoarchaean Barberton greenstone belt, South Africa, forms the uppermost unit of the Onverwacht Group. It is dominated by ultramafic volcanic rocks interbedded with thin layers of cherty sediments that show pervasive alteration, including widespread serpentinisation, silicification and chert and quartz veining. The BARB4 drill core of the ICDP Barberton drilling project exposes a unique section through the Mendon Formation in the Manzimnyama Syncline. The komatiites are pervasively altered to an assemblage comprising quartz, chlorite, carbonate, talc, biotite, and, locally, plagioclase, K -feldspar, muscovite, amphibole, stilpnomelane and ankerite. The overlying sediments are made up of banded iron formations and rare beds of siliciclastic rocks. Though the altered komatiites are pervasively silicified, SiO2, contents do not exceed 58 wt.%, and their major and trace element geochemistry is similar to other komatiitic rocks of the Mendon Formation, particularly those of the M2v-member.
机译：3.33至3.26至3.26 Ga Mendon Mentation在南非古山的Barberton Greenstone Belt，形成了Onverwacht集团的最高单元。它由互相嵌入的超微火山岩主导，薄层剧烈沉积物，显示出普遍改变，包括广泛的蛇形化，硅化和燧石和石英纱。 ICDP Barberton钻井项目的Barb4钻头核心通过Manzimnyama Syncline的Mendon Medition公开了独特的部分。将Komatiites普遍地改变为包含石英，亚氯，碳酸盐，滑石，生物素和，局部，Plagioclase，K -Feldspar，Muscovite，锥形，斯蒂巴马烷和尾菌属的组合物。覆盖沉积物由带状铁形成和粗岩的稀有床组成。虽然改变的Komatiites是普遍硅化的，但含量不超过58重量％。％，其主要和微量元素地球化学类似于孟顿形成的其他柯马蒂米岩，特别是M2V-构件。

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