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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Kaolinite in the Upper Cretaceous-Paleogene sedimentary facies of Bahariya Oasis, Egypt: Nature and origin
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Kaolinite in the Upper Cretaceous-Paleogene sedimentary facies of Bahariya Oasis, Egypt: Nature and origin

机译：埃及巴哈里亚绿洲上白垩统-古近纪沉积相中的高岭石：性质与成因

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摘要

Kaolinites in the sedimentary facies of Bahariya Oasis, Egypt were found ill four formations; the Cenomanian clastics of the Bahariya Formation, the Eocene iron ore of the Naqb-Qazzun Formation, the late Lutetian - Bartonian glauconites of the Hamra Formation and the conglomerates and sandstones of the Oligocene Qatrani Formation. Kaolinites occur as beds, bands, lenses or pockets of white to gray deposits either as single phase or mixed with other clay minerals such as smectite, glauconite and halloysite. Based on their genesis the kaolinites were subdivided into authigenic and detrital kaolinites. Authigenic kaolinites Occur as well-developed stacked hexagonal and book-like flakes in the sandstones of Bahariya and Qatrani Formations and rosette-like shaped in the halloysite pockets inside the iron ore of the Naqb-Qazzun Formation. These kaolinites were formed as a result of alteration of Al-rich minerals such as feldspars and glauconite. Detrital kaolinites occur as undefined, deformed and crumbled flakes in the kaolinite beds of the Hamra Formation. They were formed as a result of tropical weathering of pre-existing Al-rich rocks such as the crystalline igneous rocks that are situated south and southeast of the studied localities reflecting prevailing tropical conditions during that time.
机译：在埃及的巴哈里亚绿洲的沉积相中发现了高岭石，共有四个岩层。 Bahariya组的新生代碎屑岩，Naqb-Qazzun组的始新世铁矿石，Hamra组的晚卢特斯-巴顿型青绿岩以及渐新世Qatrani组的砾岩和砂岩。高岭土以床，条带，晶状体或白色至灰色沉积物的口袋形式存在，或者是单相的，或者是与其他粘土矿物（如蒙脱石，青石和埃洛石）混合而成的。基于它们的起源，高岭石被分为自生的和碎屑的高岭石。自生高岭土出现在Bahariya和Qatrani地层的砂岩中，并发育成堆积的六角形和书本状薄片状，Naqb-Qazzun地层的铁矿石内的埃洛石矿穴中形成玫瑰花状。这些高岭石是由于富铝矿物（如长石和青钙石）的改变而形成的。碎屑高岭石在哈姆拉组的高岭土层中以未定义，变形和破碎的片状出现。它们是由于先前存在的富铝岩石的热带风化而形成的，例如位于研究地点的南部和东南部的结晶火成岩，反映了当时的热带气候。

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