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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >Re-examination and reinterpretation of the stratigraphy of the Matjies River Formation, Cango Caves Group, Neoproterozoic to early Palaeozoic Saldania Belt, South Africa
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Re-examination and reinterpretation of the stratigraphy of the Matjies River Formation, Cango Caves Group, Neoproterozoic to early Palaeozoic Saldania Belt, South Africa

机译：重新审查和重新诠释Matjies河流的地层，Cango Caves Group，Neoproterozoio至南非早期的古生古代萨尔达丹岛

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摘要

The carbonate-siliciclastic rocks of the late Neoproterozoic Matjies River Formation, Cango Caves Group (CCG) in South Africa, form part of the Neoproterozoic to early Palaeozoic Saldania Belt. Re-examination of the Matjies River Formation, consisting of the Nooitgedagt and overlying Kombuis members, led to a revision of the stratigraphy and interpretation of the geology of this formation. The discovery of unconformities, locally associated with palaeovalleys and/or ferruginous sedimentary rocks, makes it possible to subdivide the Matjies River Formation into a number of unconformity-bounded sequences which comprise coarsening upward and to a lesser extent fining upward sedimentary cycles. The unconformities and palaeovalleys are of tectonic and/or possibly glaciogenic origin. The clastic sediments of the Nooitgedagt Member were thought to be supplied from an eastern source area. However, the occurrence of thick very coarse, locally poorly-sorted conglomerates, which occur in a restricted north to south trending zone, also indicates a northern and/or southern provenance for the Nooitgedagt Member. The Nooitgedagt Member has been deformed in north-northeast - south-southwest trending synclines and anticlines during the Neoproterozoic to early Palaeozoic Pan-African Orogeny. East-west trending synclines and anticlines, which formed during the Palaeozoic and early Mesozoic orogenic events, are quite common in the overlying Kansa Group and Cape Supergroup but were not found in the Matjies River Formation. Soft-bodied Ediacaran-type and skeletal fossils were found in the Nooitgedagt and Kombuis members and indicate an Ediacaran age for the Matjies River Formation.
机译：碳酸盐 - 硅淤积岩石的碳酸盐岩石河河组，南非Cango Caves Group（CCG），为早期的古教古中毒萨尔达丹群体形成了一部分。重新审查Matjies河流形成，由Nooitgedagt和覆盖的Kombuis成员组成，导致了对该形成地质的地层和解释的修订。发现与古价和/或铁艺沉积岩局部相关的不一致系数，使得可以将Matjies河形成细分为许多不整合有界序列，其包括向上粗糙并呈澄清向上沉积循环的较小程度。不整合和古价覆盖物具有构造和/或可能的冰川原始来源。被认为是Nooitgedagt成员的碎片沉积物从东部来源地区提供。然而，在受限制的北趋向区发生的厚度非常粗糙的局部含量不良的砾岩的发生，也表明了Nooitgedagt成员的北部和/ /或南部来源。 Nooitgedagt会员在北东北 - 南西南途中的趋势同胞和天线在新核古代至古生古泛山脉洋葱中造成了变形。在古生代和早期中生代血小杂体事件中形成的东西趋势同圈和抗线在覆盖的堪萨州和普通的超级中是非常普遍的，但在Matjies河流中没有找到。在Nooitgedagt和Kombuis成员中发现了软体埃迪基菌型和骨骼化石，并表明了Matjies河流形成的埃迪卡兰年龄。

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