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Summer and Verosub (1987 a,b) examined vitrinite reflectance data from 24 wells in the Puget Lowland, Willapa Hills, and Coast Ranges of western Washington and Oregon. In many of the vitrinite reflectance-versus-depth profiles there is little variation of Ro as a function of depth, suggesting that large vertical sections of sedimentary rocks have been heated to maximum temperatures on the order of 60 to 150°C. These authors speculate that the unusual vitrinite reflectance profiles are the product of extensive hydrothermel alteration of thousands of meters of sedimentary units and that the source of heat for this alteration is Oligocene to Miocene volcanic activity. In order to test the interpretations of Summer and Verosub (1987 a,b) for southwestern Oregon, we determined fission-track (FT) ages and track lengths for ten Paleocene to middle Eocene surface sandstones representing 2000 m of section in the Tyee Basin. The pooled FT ages for detrital apatite grains the Eocene section range from 70 to 90 Ma, and the FT ages increase slightly with increasing stratigraphic age. The mean track lengths for this interval are 13 to 14/Jm. The pooled apatite FT age for detrital grains in the P

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Author

Hisatoshi Ito

Publisher

Elsevier Science; Elsevier ; Pergamon Press Ltd.; Elsevier BV (ISSN 0969-8078)

Published

1993

Language

EN

Field

Physics and Astronomy (Physical Sciences)