Examining the Topographic Evolution of Volcanic Landscapes along an Island Chronosequence

摘要: Volcanic provinces cover~ 10% of earths subaerial surface, and their constructional and erosive evolution can pose a multitude of hazards to society, while also contributing to large-scale changes in solid earth dynamics and climate over geologic timescales. Despite the scientific and societal relevance of volcanic landscape evolution, relatively little is known about the pace and style of erosion and topographic development on volcanic terrains. The progressive dissection of volcanic ocean islands by rivers clearly expressed in island topography along age-progressive hotspot chains presents an exceptional opportunity to observe and quantify fluvial landscape development. We construct a chronosequence of volcanic landscape evolution by compiling geologic maps and performing topographic analyses on volcanic ocean islands of various age worldwide. Our analyses suggest that, once bedrock permeability …