Episodic accretion and plutonism in southwestern Alaska

Details Episodic accretion and plutonism in southwestern Alaska Episodic accretion and plutonism in southwestern Alaska

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49...29r&link_type=abstract

Earth and Planetary Science Letters, Volume 49, Issue 1, p. 29-33.

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Paleontologic and radiometric dating of the accretionary prism and magmatic arc of southwestern Alaska reveal an history of episodic accretion and plutonism. Possible accretion events in the Triassic (220-195 m.y.) and Early Jurassic (184-176 m.y.) were followed by Middle Cretaceous (108-83 m.y.), earliest Paleogene (65-60 m.y.), Middle Paleogene (50-40 m.y.), and Neogene (25-0 m.y.) accretion episodes. Plutonic events, which alternate with the accretion events, occurred in the Early Jurassic (193-184 m.y.), Middle/Late Jurassic (176-145 m.y.), Late Cretaceous/Early Paleogene (83-50 m.y.), and Late Paleogene (38-26 m.y.). Episodicity of accretion events is an apparent cause of incomplete stratigraphic records in the accretionary prism and forearc basin.

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