新西兰惠灵顿维多利亚大学Simon Lamb小组近日取得一项新成果。经过不懈努力，他们提出了非洲南部巴伯顿绿岩带的大规模海底滑坡——古太古代俯冲和大地震的证据。相关论文于2024年2月27日发表在《地质学》杂志上。

研究人员称，研究区露头模式和规模与新西兰活跃的Hikurangi俯冲带的，中新世至近期海底滑坡的露头模式和规模非常相似，这些海底滑坡是由俯冲大逆冲断层上的地震周期性触发的，这为古太古代的大逆冲断层地震提供了证据。

据研究人员介绍，南非巴伯顿绿岩带的新测图显示，其中部是一个由浅水和深水硅质碎屑和火山滑动块体组成的伪地层，单个块体的长度从几十米到10公里不等。

附：英文原文

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

Author: Simon Lamb, Cornel E.J. de Ronde

Issue&Volume: 2024-02-27

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.

DOI: 10.1130/G51997.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G51997.1/635654/Large-scale-submarine-landslides-in-the-BarbertonredirectedFrom=fulltext