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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 >New geochemical and palaeomagnetic results from neoarchaean dyke swarms in the badplaas-barberton area, SOUTH AFRICA
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New geochemical and palaeomagnetic results from neoarchaean dyke swarms in the badplaas-barberton area, SOUTH AFRICA

机译：南非巴德普拉斯-巴伯顿地区新古生代群新的地球化学和古地磁结果

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摘要

A geochemical and paleomagnetic study was performed on southwest to northeast and northwest to southeast trending dyke swarms in the Badplaas-Barberton area, South Africa. The aims of the study were to contribute towards the debate on the tectonic setting and genesis of these calc-alkaline to tholeiitic dyke swarms. Thermomagnetic analysis indicated a very complex intrusion history with several episodes of magma influx and/or re-magnetization. Three poorly defined poles were identified and isolated from the northwest to southeast trending dykes. These poles correlate respectively with published poles for the ca. 2984 ± 2.6 Ma Agatha basalt from the upper Pongola Supergroup, the 2.71 to 2.66 Ga Allanridge Formation of the Ventersdorp Supergroup, as well as the 2050 ± 12 Ma Bushveld Complex. Overlapping geochemical signatures for the calc-alkaline northwest to southeast trending and more tholeiitic southwest to northeast trending dyke swarms prevent clear distinction between the proposed different intrusion events. However, geochemical similarities with previously published data from the Nsuze Group and upper Ventersdorp Supergroup, respectively, suggest tectonic settings ranging from intra-continental rift to back-arc settings.
机译：在南非的Badplaas-Barberton地区，对西南至东北和西北至东南的趋势堤防群进行了地球化学和古磁研究。该研究的目的是促进对这些钙碱性至胆管堤群的构造背景和成因的辩论。热磁分析表明侵入历史非常复杂，有几次岩浆涌入和/或重新磁化。从西北到东南的趋势堤防被识别并隔离了三个极差的极点。这些极分别与ca的已发布极相关。来自上部Pongola超群的2984±2.6 Ma Agatha玄武岩，Ventersdorp超群的2.71至2.66 Ga Allanridge组以及2050±12 Ma的Bushveld复合体。钙碱性的西北向东南趋势和更多的西南西南向东北趋势的堤坝群具有重叠的地球化学特征，从而无法明确地区分拟议的不同入侵事件。然而，分别与Nsuze组和上Ventersdorp超级组先前发表的数据的地球化学相似性表明，构造背景从陆内裂谷到后弧背景不等。

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