Liquine-Ofqui's fast slipping intra-volcanic arc crustal faulting above the subducted Chile Ridge.

ABSTRACT: The southernmost portion of the Liquiñe-Ofqui fault zone (LOFZ) lies within the proposed slab window which formed due to oblique subduction of the Chile Ridge in Patagonia. Mapping of paleo-surface ruptures, offsets, and lithological separations along the master fault allowed us to constrain geologic slip rates for the first time with dextral rates of 11.6-24.6 mm/year (Quaternary) and 3.6-18.9 mm/year (Late-Cenozoic) respectively. We had trouble mapping the LOFZ in one local because of a partially collapsed and previously undiscovered volcanic complex, Volcan Mate Grande (VMG: 1,280 m high and thus Vesuvius-sized) that grew in a caldera also offset along the LOFZ and has distinct geochemistry from adjacent stratovolcanoes. Besides the clear seismic and volcanic hazard implications, the st

SUBMITTER: De Pascale GP 

PROVIDER: S-EPMC8007613 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature