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首页> 外文期刊>Journal of African Earth Sciences >Geochemistry and lithostratigraphy of the mugher mudstone: Insights into the late jurassic-early cretaceous clastic sedimentation in Ethiopia and its surroundings
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Geochemistry and lithostratigraphy of the mugher mudstone: Insights into the late jurassic-early cretaceous clastic sedimentation in Ethiopia and its surroundings

机译：Mugher Mudstone的地球化学和Lithostratigraphy：埃塞俄比亚及其周边地区近期侏罗纪早期白垩纪泥浆沉降的见解

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Deposition of clastic rocks during the Jurassic -Cretaceous periods in Ethiopia are sources of vital information on the nature and timing of the withdrawal of the Tethyan Sea from Northeast Africa. The Mugher Mudstone is one of these clastic rocks in Ethiopia.Lithostratigraphic, mineralogical and geochemical studies were conducted on the Mugher Mudstone to constrain the sedimentation history, provenance and tectonic setting of the basin. Mapping of the northern part of the Abay Basin showed that the Mugher Mudstone extends up to 10 degrees 51'20 '' N. The formation is constituted by sandstones, mudstones, siltstones and claystones. The sandstones and mudstones constitute more than 95% of the formation. Quartz is dominant with accessories of K-feldspar, muscovite, zircon and sphene. The Mugher Mudstone is highly depleted in Na2O, K2O,CaO, MgO, Rb, Sc, Ni, and Co while it is enriched in SiO2, Ta, Zr, Nb, and Hf. Elemental distribution shows significant variation among the different size classes. Siltstones and mudstones are enriched in Zr and Hf while clays are highly enriched in REE. These features together with calculated indices and ratios demonstrate high degree of weathering, recycling and sorting. Triangular and bivariant discrimination diagrams of trace elements suggest mixed source rocks of mafic metavolcanics, metaultramafics and recycled metasedimentary rocks deposited in a passive margin setting. Finally, the high degree of recycling, textural and compositional maturity may indicate the Early Cretaceous had humid paleoclimate and stable uplifted source area in the region favoring a prolonged weathering, recycling and sorting.
机译：在埃塞俄比亚的侏罗纪岩石期间沉积碎片岩石是关于从东北非洲撤离Tethyan海的性质和时间的重要信息的来源。摩尔泥岩是埃塞俄比亚的这些碎片岩石之一.Lithostraphic，矿物学和地球化学研究是在摩尔泥岩上进行的，以限制盆地的沉降历史，来源和构造环境。 ABAY盆地北部的映射表明，摩尔泥岩延伸到10度51'20'N.形成由砂岩，泥岩，淤泥和粘土构成。砂岩和泥岩占形成的95％以上。石英占据了K-Feldspar，Muscovite，锆石和斯派的配件。 Mugher Mugstone在Na2O，K 2 O，CaO，MgO，Rb，Sc，Ni和Co中高度耗尽，同时它富含SiO2，Ta，Zr，Nb和Hf。元素分布显示不同大小类之间的显着变化。淤泥和泥岩在Zr和HF中富集，而粘土在ree中高度富集。这些特征与计算的指数和比率一起表现出高度的风化，回收和分类。微量元素的三角和双变判集图表明了MAFIC Metavolcanics的混合源岩，Metaultramafics和再生在被动边缘设置中的回收利用岩石。最后，高度的回收程度，纹理和组成成熟度可能表明，在该区域中，早期的白垩纪具有延长耐候，回收和分选的区域中具有潮湿的古平底和稳定的振源区域。

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