Large-scale submarine landslides in the Barberton Greenstone Belt, southern Africa—Evidence for subduction and great earthquakes in the Paleoarchean

Geology Pub Date : 2024-02-27 DOI:10.1130/g51997.1
Simon Lamb, C. D. de Ronde
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Abstract

New mapping of the Barberton Greenstone Belt in South Africa shows that the central part is a pseudo-stratigraphy made of shallow-water and deep-water siliciclastic and volcanic slide blocks, with individual blocks ranging in size from tens of meters to >10 km in length. The outcrop pattern and scale are remarkably similar to those of large-scale Miocene to recent submarine landslides in New Zealand along the active Hikurangi subduction zone that are periodically triggered by earthquakes on the subduction megathrust, providing evidence for megathrust earthquakes in the Paleoarchean.
非洲南部巴伯顿绿岩带的大规模海底滑坡--古近纪俯冲和大地震的证据
对南非巴伯顿绿岩带的新测绘表明,该绿岩带的中部是由浅水和深水硅质碎屑岩及火山岩滑动块组成的伪地层,单个滑动块的长度从几十米到大于 10 公里不等。该地层的出露模式和规模与新西兰中新世至近期沿活跃的希库兰吉俯冲带发生的大规模海底滑坡极为相似,这些滑坡由俯冲大地壳上的地震定期触发,为古新世的大地壳地震提供了证据。
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