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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 >A Pleistocene Thrust Fault in Anorthosite of the Rustenburg Layered Suite near Mooinooi, North West Province, South Africa: Neotectonic Implications
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A Pleistocene Thrust Fault in Anorthosite of the Rustenburg Layered Suite near Mooinooi, North West Province, South Africa: Neotectonic Implications

机译：南非南部西部MOOINOOI附近的Rustenburg分层套件附近的更新世推力断裂

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摘要

The 2.056 Ma Bushveld Complex (BC) constitutes the largest layered igneous complex known. The complex forms a basin defined by strata that dip centripetally (10° to 20°). This depression presumably resulted from the load of the complex as was proposed by a number of authors. Sagging of between 460 to 740 m appears possible, resulting in flexural-slip movement. This flexural-slip manifests in many thrust faults, (mainly mapped in mines) which display reverse-slip. The research described in this paper focuses on the age of this deformation. A thrust fault was identified at Lonmin U14 Pit. Reverse slip along the fault displaced unconsolidated sedimentary material that unconformably overlies the Rustenburg Layered Suite strata. Archaeological artefacts (Acheulian hand axes) were discovered buried in this sedimentological layer and provide an age constraint of 1.25 Ma to 250 000 years. Optically stimulated luminescence (OSL) dating further constrained the age of the sedimentary material to less than 175 000 years. The youngest material deposited is a regional black clay layer. At Lonmin U14 Pit this clay layer carries a fabric that resulted from the movement of the thrust and this indicates an age significantly younger than 175 000 years.
机译：2.056 MA BUSHVELD复合体（BC）构成着名的最大的分层络合物。复合物形成由倾角点心的地层定义的盆地（10°至20°）。这种凹陷可能是由于许多作者提出的复杂的负荷。在460到740米之间的下垂可能，导致弯曲滑动运动。这种弯曲滑动在许多推力故障中表现出来，（主要映射在矿山中），其显示反向滑动。本文描述的研究侧重于这种变形的年龄。在Lonmin U14坑中识别出推力故障。沿着逆转滑动沿着断层移位，不合适地覆盖了Rustenburg分层套房层的沉积物。在该沉积学层中发现考古文物（Acheulian手轴）被发现埋藏，并提供1.25 mA至25万年的年龄约束。光学刺激的发光（OSL）约会进一步约束沉积物质的年龄至小于17.5万年。沉积的最年轻材料是区域黑色粘土层。在Lonmin U14坑上，这种粘土层带来织物，由推力的运动导致，这表明年龄小于17.5万年。

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