Sedimentary Record of Cenozoic Tectonics, Basin Development, and Climate Along the Eastern Margin of the Southern Alaska Convergent Plate Boundary ...

• Main Author: Allen, Wai Kehadeezbah
• Format: Text
• Language: unknown
• Published: Purdue University Graduate School 2023
• Subjects: Sedimentology; Stratigraphy incl. biostratigraphy, sequence stratigraphy and basin analysis; Structural geology and tectonics; Geochronology; Pacific; alaska range; Yakutat; Alaska
• Online Access: https://dx.doi.org/10.25394/pgs.22255480.v1; https://hammer.purdue.edu/articles/thesis/Sedimentary_Record_of_Cenozoic_Tectonics_Basin_Development_and_Climate_Along_the_Eastern_Margin_of_the_Southern_Alaska_Convergent_Plate_Boundary/22255480/1

The northern Pacific plate boundary along the southern Alaska convergent margin is characterized by a west to east transition from normal (Aleutian trench) to flat slab subduction related to ongoing oblique collision of the Yakutat microplate. The deformation along the eastern part of the southern Alaska convergent margin is marked by the eastern Alaska Range inboard of the margin and the Chugach-St. Elias Mountains outboard of the margin. Inboard of the margin, the Denali fault outlines the trace of the eastern Alaska Range. New stratigraphic, geochronologic, and provenance analysis from Eocene-Pliocene strike-slip basins along this fault system provides a record of both basin development and displacement amounts. Key findings include post-Eocene displacement of ~ 470 km on the eastern Denali fault, Miocene displacement of 230 km on the ~ Totschunda fault, and Late Miocene to Pliocene displacement of 80-90 km on the Kimball fault section. The strike-slip displacement history for this part of the fault has ...