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- W2003182403 abstract "The post Early Cretaceous tectonic development of the northern Andean segment (north of 5°S) is loosely constrained by a series of partially and fully reset K/Ar ages. New apatite and zircon fission track data from three traverses across the Cordillera Real of Ecuador reveal distinct periods of accelerated crustal cooling during the Cenozoic. Fission track ages range from 65 to 14 Ma (zircon) and 44 to 8 Ma (apatite), with apatite mean track lengths ranging from 14.6 to 12.1 μm. These results record rapid cooling rates during ∼ 43 – 30 Ma, 23–15 Ma, and 10–0 Ma occurring at temperatures below ∼ 275°C. The events reflect up to ∼ 9 km of crustal exhumation in various regions of the Cordillera in response to relative changes in the kinematics of the Farallon, Nazca, and South American plates. The exhumation history of the Cordillera Real was not continuous but rather evolved during separate phases. These phases persisted for ∼ 10 Myr and are partly coincident with tectonic phases of the central Andes, although extend for longer time periods, possibly as a result of isostatically driven crustal exhumation. Large spatial variations in the zircon and apatite fission track data within the Cordillera Real indicate that local fault-bounded massifs have experienced different thermal histories since ∼ 43 Ma. Major variations are not restricted to the regional scale and exist within individual terranes. Faulted slivers within terranes demonstrate highly variable exhumation histories, suggesting that deformation was not dominated by terrane-bounding faults. Additionally, N-S variations in exhumation depths suggest that ∼ NE-SW trending faults have been active since ∼ 10–9Ma." @default.
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- W2003182403 date "2000-08-01" @default.
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- W2003182403 title "Low-temperature thermochronology of the northern Cordillera Real, Ecuador: Tectonic insights from zircon and apatite fission track analysis" @default.
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- W2003182403 doi "https://doi.org/10.1029/2000tc900010" @default.
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