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首页> 外文期刊>Journal of African earth sciences >Resolving cryptic stratigraphy in the Ecca Group, Karoo Basin, South Africa: Elucidating the Ripon and Laingsburg depocenters
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Resolving cryptic stratigraphy in the Ecca Group, Karoo Basin, South Africa: Elucidating the Ripon and Laingsburg depocenters

机译：解决ECCA集团的隐秘地层，南非卡罗盆地：阐明了Ripon和Laingsburg Depenters

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The regionally well-known Laingsburg depocenter and lesser-known Ripon depocenter is situated between Prince Albert (Western Cape) and Willowmore (Eastern Cape) of the southern Main Karoo Basin, South Africa. Independently, both depocenters are well studied and boast a plethora of literature specifically on key lithostratigraphic units including the Laingsburg and Vischkuil formations (Laingsburg depocenter) and the Ripon Formation (Ripon depocenter). At first glance, exposures of these formations indicate a possible interfingering relationship; yet, the linkages between these two depocenters and their lithostratigraphic units remain cryptic and unresolved. Therefore, this study sought to re-address this unresolved complexity between the Laingsburg and Ripon depocenters by coupling traditional and novel sedimentological techniques. Through detailed facies and architectural analysis, this study was successful in producing a rigorous basin reconstruction, which indicates that sediments were emplaced with a basin floor to slope palaeoenvironment. Broad-scale facies reconstruction coupled with sedimentary petrology indicates that the two depocenters have slightly different source regions and represent two separable submarine fan complexes. These results are corroborated when coupled with markedly different zircon histories recovered from the Ripon (Antarctica provenance: Dyer arc) and Laingsburg (South American provenance: Northern Patagonia Massif, Choiyoi Provence) depocentres. This study was successful in resolving that distinct sedimentological, petrological, and geochronological differences are present between these two depocenters.
机译：地区众所周知的Laingsburg Depenenter和较鲜为人知的Ripon Depenter位于南非南部主要卡卢盆地的艾伯特（西开普省）和柳湾（东开普省）之间。独立地，两种文档都很好地研究过，专门针对关键的LithoStraphics单元，包括Laingsburg和Vischkuil地层（Laingsburg Depenter）和Ripon Mailation（Ripon Depenter）的关键岩石棘手单元。乍一看，这些地层的暴露表示可能的间隔关系;然而，这两个卵形细胞与其岩石车辆单位之间的联系仍然是密码和未解决的。因此，本研究要求通过耦合传统和新颖的沉积学技术来重新解决Laingsburg和Ripon Dopenters之间的这种未解决的复杂性。通过详细的相和建筑分析，这项研究成功地制作了一个严谨的盆地重建，这表明沉积物被挖出到坡古环境。与沉积岩石学相结合的宽尺度相重建表明，两个卵闭具有略微不同的源区，代表两个可分离的潜水线风扇配合物。当加上从Ripon（南极洲源：戴尔弧）和Laingsburg（南美洲来源：北巴塔哥尼亚Massif，Choiyoii普罗旺斯）的贫民区，当恢复显着不同的锆石历史时，这些结果被证实了。该研究成功地解决了这两种卵闭之间存在明显的沉积学，岩石学和地理学差异。

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