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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 >Lithostratigraphy of the Skoorsteenberg Formation (Ecca Group, Karoo Supergroup), South Africa
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Lithostratigraphy of the Skoorsteenberg Formation (Ecca Group, Karoo Supergroup), South Africa

机译：Skoorsteenberg形成（ECCA集团，Karoo Supergroup），南非的Lithostrigraphy

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摘要

The Middle Permian Skoorsteenberg Formation is part of the Ecca Group (Karoo Supergroup) of South Africa. It is also known as the 'Tanqua fan complex' due to its origin as a deep-water sedimentation unit associated with a prograding deltaic system. The Skoorsteenberg Formation crops out over approximately 650 km~2 along the western margin of the Main Karoo Basin. It thins out in a northerly and easterly direction and therefore has a limited extent with cut-off boundaries to the south and north. It is underlain by the Tierberg Formation and overlain by the Kookfontein Formation, the latter being limited to the regional distribution of the Skoorsteenberg Formation. The Skoorsteenberg Formation has a composite thickness of 400 m and comprises five individual sandstone packages, separated by shale units of similar thickness. The sandstones are very fine- to fine-grained, light greyish to bluish grey when fresh, poorly sorted and lack primary porosity and permeability. The Tanqua fan complex is regarded as one of the world's best examples of an ancient basin floor to slope fan complex associated with a fluvially dominated deltaic system. It has served as analogue for many deep-water systems around the world and continues to be a most sought after "open-air laboratory" for studying the nature of fine-grained, deep-water sedimentation. The fan systems are essentially tectonically undeformed, outstandingly well exposed and contain an inexhaustible amount of information on the deep-water architecture of lower slope to basin floor turbidite deposits.
机译：Midden Skoorsteenberg形成是南非ECCA集团（Karoo Supergroup）的一部分。由于其原点作为与促进红细系统相关的深水沉降单元，它也被称为“坦古风扇综合体”。 Skoorsteenberg形成沿着主菜盆地的西部边缘大约650公里〜2。它以北方和东风方向介绍，因此在南部和北方的截止边界有有限的程度。它由Tierberg的形成和俯视Kookfontein形成，后者仅限于Skoorsteenberg形成的区域分布。 Skoorsteenberg形成的复合厚度为400米，包括五个单独的砂岩封装，由页岩单位的相似厚度分开。砂岩非常细小 - 在新鲜，缺乏良好的孔隙度和渗透性时，光灰色灰色灰色灰色灰色。 Tanqua Fan Complex被认为是世界上一个古老的盆地地板的最佳例子之一，倾斜风扇络合物与氟普通的尖端系统相关联。它为世界各地的许多深水系统而言，它仍然是最受欢迎的“露天实验室”，用于研究细粒度，深水沉降的性质。风扇系统基本上是根本上的，突出地暴露，突出良好的曝光，并包含有关较低坡度的深水架构到盆地地板浊度沉积物的无穷丰富的信息。

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