Turbidite Megabeds in an Oceanic Rift Valley Recording Jökulhlaups of Late Pleistocene Glacial Lakes of the Western United States.

作者: G. G. Zuffa , W. R. Normark , F. Serra , C. A. Brunner

DOI: 10.1086/314404

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摘要: Abstract Escanaba Trough is the southernmost segment of Gorda Ridge and filled by sandy turbidites locally exceeding 500 m in thickness. New results from Ocean Drilling Program (ODP) Sites 1037 1038 that include accelerator mass spectrometry (AMS) 14C dates revised petrographic evaluation sediment provenance, combined with high‐resolution seismic‐reflection profiles, provide a lithostratigraphic framework for turbidite deposits. Three fining‐upward units upper 365 at ODP Site can be correlated recovered Deep Sea (DSDP) 35. Six AMS ages 317 sequence indicate average deposition rates exceeded 10 m/k.yr. between 32 11 ka, nearly instantaneous one ∼60‐m interval sand. Petrography sand beds consistent Columbia River source entire sedimentary Trough. High‐resolution acoustic strat...

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