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首页> 外文OA文献 >Petrography, modal composition and tectonic provenance of some selected sandstones from the Molteno, Elliot and Clarens Formations, Karoo Supergroup, in the Eastern Cape Province, South Africa
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Petrography, modal composition and tectonic provenance of some selected sandstones from the Molteno, Elliot and Clarens Formations, Karoo Supergroup, in the Eastern Cape Province, South Africa

机译：来自Molteno，Eltiot和Clarens的一些选定的砂岩的岩画，模态组成和构造来源，南非东开普省的喀鲁斯超级群组

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The Late Triassic - Early Jurassic non marine clastic sediments of the Molteno, Elliot and Clarens Formations were studied to deduce their mineralogy and tectonic provenance. The study is based on road-cut exposures of the formations in the Eastern Cape Province of South Africa. Petrographic studies based on quantitative analysis of the detrital minerals shows that the clastic sediments (mostly sandstones) are predominantly made up of quartz, feldspars, and metamorphic and igneous rock fragments. Among the main detrital framework grains, quartz constitutes about 62-91%, feldspar 6-24% and 3-19% of lithic fragments. The sandstones can be classified as both sublitharenite and subarkose. Although, most of the sandstones (> 70 %) plotted in the sub-litharenite field. Petrographic and XRD analyses revealed that the sandstones originated from granitic and metamorphic rock sources. The QFL (Quartz-feldspar-lithic fragments) ternary diagrams indicate that the sandstones were derived from recycled or quartzose source rocks reflecting a craton interior or transitional continental setting which probably came from the Cape Fold Belt. This possibly revealed that most of the sandstones might have been derived as a result of weathering and erosion of igneous and metamorphic rocks in the Cape Supergroup. The study has revealed the depositional environments, and provide a basis for the description and interpretation of the sedimentology of the Molteno, Elliot and Clarens Formations.
机译：研究了晚期三叠纪 - 早期的侏罗纪非海洋碎屑沉积物，莫尔永，Elliot和澄清组形成，推导出矿物学和构造出处。该研究基于南非东开普省地区的道路切割曝光。基于滴乳矿物的定量分析的岩体研究表明，碎屑沉积物（大多是砂岩）主要由石英，长石和变质和火成岩碎片组成。在主要的滴乳框架之粒中，石英构成约62-91％，长石6-24％和3-19％的锂碎片。砂岩可以被归类为宿霉菌和亚泊糖。虽然，大多数砂岩（> 70％）绘制在亚锂蒽砂岩场中。岩体和XRD分析显示，砂岩源于花岗岩和变质岩石。 QFL（Quartz-FeldSpar-Lithic片段）三元图表明砂岩源自回收或石英源岩石，反射了可能来自披肩折叠带的CRATON内部或过渡欧陆定位。这可能透露，大多数砂岩可能是由于斗篷超级中的火棘和变质岩石的风化和侵蚀而得出的。该研究揭示了沉积环境，并为莫尔永，Elliot和澄清形成的沉积学提供了描述和解释的基础。

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