Tectonic evolution of the Priest River complex, northern Idaho and Washington: A reappraisal of the Newport fault with new insights on metamorphic core complex formation

Article Abstract:

There are various incompatible hypotheses for the origin and tectonic significance of the Priest River complex, with much of the uncertainty stemming from the paradoxical relationships between the U-shaped Newport fault system, the Purcell Trench fault system and the Spokane dome mylonite zone. New geological mapping, metamorphic themobarometry and (super40)Ar/(super39)Ar have been used to present a synthesis fo the geology of the Priest River complex. It is concluded that the western Newport fault and the Spokane dome mylonites form part of an east-verging detachment fault and that the eastern Newport fault and Purcell Trench faults are an antithetic, en echelon, detachment fault system.

Natural history, Rivers

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Recent tectonic evolution and present stress in the Northern Appenines

Article Abstract:

The current-day stress field and recent tectonic evolution in the Northern Appenines have been reconstructed using borehole breakout analysis of crustal earthquakes, compared with paleostress data. It is argued that the extension-compression pair has migrated in time from late Miocene to Present just in the northern arc sector, while the southern sector underwent generalized extension, since middle Pleistocene.

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Low-temperature thermochronology of the northern Cordillera Real, Ecuador: Tectonic insights from zircon and apatite fission track analysis

Article Abstract:

Zircon and apatite fission track analysis was used to study low-temperature thermochronology of the northern Cordillera Real, Ecuador.

Apatite, Apatites

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