6533b86efe1ef96bd12cb543

RESEARCH PRODUCT

Time Markers for the Evolution and Exhumation History of a Late Palaeozoic Paired Metamorphic Belt in North-Central Chile (34°-35°30'S)

Stuart N. ThomsonStuart N. ThomsonJan R. WijbransJo-anne WarthoFrancisco HervéAlfred KrönerArne P. Willner

subject

Series (stratigraphy)Accretionary wedgePaleozoicNorth centralMetamorphic rock/dk/atira/pure/sustainabledevelopmentgoals/life_below_waterPaleontologyGeophysicsGeochemistry and PetrologyOceanic crustFoliation (geology)SDG 14 - Life Below WaterAccretion (geology)Geology

description

A multi-method geochronological approach is applied to unravel the dynamics of a paired metamorphic belt in the Coastal Cordillera of central Chile. This is represented by high-pressure - low-temperature rocks of an accretionary prism (Western Series), and a low-pressure- high-temperature overprint in the retro-wedge with less deformed metagreywackes (Eastern Series) intruded by magmas of the coeval arc. A pervasive transposition foliation formed in metagreywackes and interlayered oceanic crust of the Western Series during basal accretion near metamorphic peak conditions (∼350-400°C, 7-11 kbar) at 292-319 Ma (

10.1093/petrology/egi036https://doi.org/10.1093/petrology/egi036