rift

Les parois des grabens de rifts ou caldeiras des sommets d'édifices volcaniques d'activité récente sont par définition instables et accidentées, bien qu'on trouve parfois, dans le fond des rifts et des caldeiras, des surfaces planes où les sulfures polymétalliques peuvent s'accumuler.
The walls of rift grabens or summit calderas of recently active volcanic edifices are inherently unstable and rugged, although the bottoms of rifts and calderas may include locally flat areas where polymetallic sulphides may accumulate.
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