Pie de Palo, Argentina: A cataclastic diapir

摘要: The term cataclastic diapirism is proposed for the low-temperature extrusion of highly fractured rocks through more competent strata to produce domed topographies at surface. process illustrated by reference geomorphology, neotectonics and microseismicity Pie de Palo, an elongated ridge in western Sierras Pampeanas Argentina composed shattered sheared Lower Palaeozoic subject coseismic uplift. Palo conventionally interpreted as a fault-driven basement fold linked low-angle eastward subduction Nazca plate beneath South America; diapiric model implies instead that deformation powered regional compression from west-verging, near-surface, crustal shortening which results ultimately Atlantic spreading.