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

E.M. Bordy; S. Spelman; D.I. Cole; P. Mthembi

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

机译：Pietermaritzburg形成（ECCA集团，Karoo Supergroup），南非的Lithostrataphy

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The Lower Permian Pietermaritzburg Formation is a mudrock-dominated, upward-coarsening stratigraphic unit in the lower Ecca Group (Karoo Supergroup) in the northeastern part of the main Karoo Basin of South Africa. The formation extends over most of the KwaZulu-Natal Province, and due to its lithology and the local climate, it is usually poorly exposed; hence the description is mainly based on borehole records. From a measured thickness of about 430 m south of the type area around Pietermaritzburg, the formation thins progressively northwards and pinches out against the Dwyka Group and pre-Karoo basement north of latitude 26° 30' S. This Lower Permian formation is considered a stratigraphic equivalent of the Prince Albert Formation in the southern part of the main Karoo Basin. The Pietermaritzburg Formation only preserves scattered, fragmentary plant fossil and invertebrate trace fossils, which are diagnostic of marine conditions (e.g. Helminthopsis). Based on its sedimentary facies characteristics and ichnofossil assemblages, the unit was probably deposited under low energy conditions on a northerly shallowing marine shelf that initially experienced deepening (during a major Artinskian transgression) and then shallowing in the early Kungurian.

机译：较低的二叠纪彼得马里茨堡形成是南非主要卡罗盆地东北部的下生ECCA集团（Karoo Supergroup）的迷人占据的向上粗化的地层单位。该地层延伸到大部分夸祖鲁 - 纳塔尔省，由于其岩性和当地气候，通常暴露不佳;因此，描述主要基于钻孔记录。从Pietermaritzburg周边地区南部的测量厚度从约430米左右，形成北向北朝向Dwyka组和纬度纬度北部的前karoo地下室，这是较低的二叠纪的形成被认为是地层相当于阿尔伯特王子形成在南部的主要卡卢盆地。 Pietermaritzburg形成只保留散射，零碎的植物化石和无脊椎动物痕量化石，这是诊断海洋状况（例如Helmintopsis）。基于其沉积相特征和Ichnofossil组合，该单位可能在北苍蝇的低能量条件下沉积在最初经历深化（在主要的Artinskian违规期间），然后在早期的Kungurian中沉积。

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来源
《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》 |2017年第2期|共10页
作者
E.M. Bordy; S. Spelman; D.I. Cole; P. Mthembi;
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作者单位

Department of Geological Sciences University of Cape Town Private Bag X3 Rondebosch 7701 South Africa;

Department of Geological Sciences University of Cape Town Private Bag X3 Rondebosch 7701 South Africa;

Council for Geoscience PO Box 572 Bellville 7535 South Africa;

Council for Geoscience PO Box 620 Polokwane 0700 South Africa;

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原文格式 PDF
正文语种 eng
中图分类地质学;
关键词
Lower; Permian; Pietermaritzburg;

机译：较低;二叠纪;彼得法拉提茨堡;

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1. Lithostratigraphy of the Pietermaritzburg Formation (Ecca Group, Karoo Supergroup), South Africa [J] . E.M. Bordy, S. Spelman, D.I. Cole, 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 . 2017,第2期

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

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