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- W1539383233 abstract "The Humboldt basin is a filled Neogene trench-slope basin within the accretionary complex immediately north of the Mendocino triple junction and adjacent to the underthrusting Juan de Fuca plate. This particular basin provides a unique opportunity for studying the transition from convergent to transform motion because of its proximity to the Mendocino triple junction. Moreover, the basin experienced almost continuous sedimentation throughout the late Neogene, and therefore yields a detailed stratigraphic record of basin deformation due to plate motion. Basin stratigraphy has recorded deformation of the upper surface of the Juan de Fuca accretionary complex as it was uplifted from lower bathyal to littoral depths during the Neogene. Geohistory analysis of Humboldt basin is based on key Neogene surface sections and detailed micropaleontologic and sedimentologic studies that are used to evaluate age and changing climate, water depth, and depositional environment through time along a trend perpendicular to the paleomargin. Oldest basin sediments consist mainly of hemipelagic mudstones deposited in a deep-water setting during elevated sea level 14-8 Ma. Turbidite sandstone intervals become common after about 3.5 Ma and can be divided into several discrete megasequence packages. Deposition of these megasequences was apparently influenced by climatically induced lowering of sea levelmore » and tectonic uplift of the adjacent coastal area. Turbidite deposition was followed by slope deposition starting about 2.2 Ma. A stratigraphic section near the eastern margin of the basin contains a thick slope, shelf, beach, fluvial sequence clearly influenced by eustatic sea level events. Humboldt basin has experienced uplift and deformation due to tectonic underthrusting and outbuilding of the accretionary prism associated with convergence of the Juan de Fuca plate.« less" @default.
- W1539383233 created "2016-06-24" @default.
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- W1539383233 date "1988-03-01" @default.
- W1539383233 modified "2023-09-22" @default.
- W1539383233 title "Late Cenozoic history of Humboldt basin, Cape Mendocino area, California" @default.
- W1539383233 hasPublicationYear "1988" @default.
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