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首页> 外文期刊>Sedimentary geology >New insights into the provenance of Saudi Arabian Palaeozoic sandstones from heavy mineral analysis and single-grain geochemistry
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New insights into the provenance of Saudi Arabian Palaeozoic sandstones from heavy mineral analysis and single-grain geochemistry

机译：重矿物分析和单粒地球化学对沙特阿拉伯古生代砂岩物源的新见解

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摘要

Saudi Arabian Palaeozoic siliciclastics cover a stratigraphic range from the Cambrian to the Permian. They crop out along the eastern margin of the Arabian Shield and are comprised of highly mature sandstones. Their heavy mineral assemblage reflects their mineralogical maturity and is dominated by the ultra-stable phases zircon, tourmaline and rutile. Less stable accessories are apatite, staurolite and garnet. Standard heavy mineral analysis of samples from two study areas in centralorthern (Tabuk area) and southern (Wajid area) Saudi Arabia reveals distinct changes in provenance. Cambrian-Ordovician sandstones are first-cycle sediments, probably sourced from the 'Pan-African' basement The overlying Hirnantian glaciogenic deposits consist of recycled Cambrian-Ordovician material. Devonian-Permian sandstones show a significant influx of fresh basement material, as attested by an increase of meta-stable heavy minerals. Single-grain geochemical analysis of rutile and garnet has proven to be a powerful supplementary technique. Rutile varietal studies reveal distinct differences in host rock lithologies between the two study areas: the Tabuk area contains predominantly felsic ruffles, whereas the Wajid area has more mafic input. Zr-in-rutile thermometry identified granulite-facies detritus in the lower Palaeozoic of the Tabuk area and has the potential to further define source areas. The distribution patterns of garnet host rock lithologies are remarkably similar in both study areas. They are dominated by amphibolite-facies metasediments and intermediate to felsic igneous rocks. Garnets derived from granulite-facies metasediments, which are scarce in the Arabian-Nubian Shield, also occur. Possible source rocks for high-grade garnets can be found in Yemen or farther south in the Mozambique Belt. (C) 2015 Elsevier B.V. All rights reserved.
机译：沙特阿拉伯古生界硅质碎屑岩覆盖了从寒武纪到二叠纪的地层范围。它们沿着阿拉伯盾的东部边缘生长，并由高度成熟的砂岩组成。它们的重矿物组合反映了其矿物学的成熟度，并以超稳定相锆石，电气石和金红石为主。不太稳定的配件是磷灰石，星形石和石榴石。对来自沙特阿拉伯中部/北部（塔布克地区）和南部（瓦吉德地区）两个研究区域的样品进行的标准重矿物分析显示出物源的明显变化。寒武纪-奥陶纪砂岩是第一周期的沉积物，可能来自“泛非”基底。上层的赫南特成岩沉积物由回收的寒武纪-奥陶纪材料组成。泥盆纪-二叠纪砂岩显示出大量的新鲜基底物质涌入，亚稳重矿物的增加证明了这一点。金红石和石榴石的单粒地球化学分析已被证明是一种强大的补充技术。金红石种类研究表明，两个研究区之间的宿主岩性岩性存在明显差异：塔布克地区主要包含长英质褶皱，而瓦吉德地区则有更多的镁铁质岩浆。锆中金红石测温法确定了塔布克地区下古生界的粒岩相碎屑，并有可能进一步确定源区。在这两个研究区中，石榴石宿主岩的岩性分布模式非常相似。它们以闪石相沉积物和长英质火成岩的中段为主。也有源自花岗石相沉积的石榴石，在阿拉伯-努比亚盾构中稀有。在也门或更南部的莫桑比克地带，可能发现有高级石榴石的烃源岩。 （C）2015 Elsevier B.V.保留所有权利。

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