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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 Abrahamskraal Formation (Karoo Supergroup), South Africa
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Lithostratigraphy of the Abrahamskraal Formation (Karoo Supergroup), South Africa

机译：南非亚伯拉罕克拉尔组岩性地层学（Karoo Supergroup）

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摘要

The Middle Permian Abrahamskraal Formation is the lowermost formation of the lower Beaufort Group (Adelaide Subgroup, Karoo Supergroup) in the main Karoo Basin. It has been amalgamated with the lithologically similar and age-equivalent Koonap Formation and now occupies the entire southern part of the main Karoo Basin. It consists of greenish-grey and less common reddish-brown mudrock and subordinate light grey fine-grained sandstone, arranged in fining-upward, 1st to 3rdorder cycles that range in thickness from a few metres to a few tens of metres. It reaches a maximum thickness in the southwest part of the basin (2200 to 2565 m) and thins northeastward with younging of the lower contact with the underlying Ecca Group and overlap of the overlying Middleton Formation onto the Ecca Group in the vicinity of Petrusville. The Abrahamskraal Formation contains several arenaceous zones in the southwest part of the basin, which increase in thickness towards a source area located along the southwest margin of the basin. The sedimentary facies represent deposition on a vast alluvial plain with lateral and downstream accretionary sand bodies in fluvial channels and floodbasin and subordinate lacustrine muds and silts in the extensive interchannel areas. Biostratigraphically, the Abrahamskraal Formation falls within the Tapinocephalus Assemblage Zone. However, along the southwestern margin of the basin, this zone is underlain by the Eodicynodon Assemblage Zone.
机译：中二叠纪亚伯拉罕克拉尔组是主要的Karoo盆地中下Beaufort组（Adelaide子组，Karoo超组）的最低层。它已经与岩性相似且年龄相同的库纳普组合并在一起，现在占据了卡鲁主盆地的整个南部。它由绿灰色且较少见的红棕色泥岩和次要的浅灰色细粒砂岩组成，呈细化向上的第1到第3阶循环，厚度范围从几米到几十米不等。它在盆地西南部达到最大厚度（2200至2565 m），并向东北变薄，与下伏的埃卡群下部接触的年轻化，以及上盖的米德尔顿组重叠在佩特鲁斯维尔附近的埃卡群上。亚伯拉罕斯克拉尔组在盆地的西南部分包含几个砂质带，这些砂带的厚度朝着盆地西南边缘的源区增加。沉积相表示在宽泛的冲积平原上的沉积，在河道中有横向和下游的增生性沙体，在河道宽泛的区域中，则有洪泛盆地和下级湖相泥沙。从生物地层学上来说，亚伯拉罕斯克拉尔组属于锥脑集合区。但是，在盆地西南边缘，该区域在Eodicynodon组合带之下。

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