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- W2107306478 abstract "A study of Willapa submarine canyon, located off the Washington coast, was undertaken in an attempt to define the type, distribution, and rate of deposition of sediment within the canyon. Well sorted sands are common on the continental shelf near the canyon head and green pelagic muds predominate within the canyon. The muds are thinly bedded and cores from the thalweg contain sand layers. Organic- and carbonate-carbon contents of sediments range between 0.2-2.9 and 0.05-1.5 per cent respectively. The clay-sized fraction of the average sediment consists of approximately 20 per cent Fe-chlorite, 30 per cent kaolinite, and 50 per cent illite with minor amounts of montmorillonoids and mixed-layer clays. Analyses of the heavy -mineral and clay-mineral suites show that the Columbia River is the most probable source of sand and mud in the canyon. The occurrence of graded sand layers containing shallow water foraminifera and heavy mineral suites similar to those of shelf sands indicate turbidity-current transport of shelf sediment along the canyon axis. The maximum rate of sedimentation on the upper slope is about 50 mg /cm2 /yr (41 centimeters per thousand years), but the total thickness of Holocene sediment in most of the canyon is only a few meters. Turbidity flows, originating on the upper slope and shelf, deposit the major portion of their sediment load west of the slope break in Cascadia Basin. Rock dredged from the canyon walls contains fossils which suggest Willapa Canyon has formed since early-Pliocene time." @default.
- W2107306478 created "2016-06-24" @default.
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- W2107306478 date "1964-01-01" @default.
- W2107306478 modified "2023-09-27" @default.
- W2107306478 title "Sediments of Willapa Submarine Canyon" @default.
- W2107306478 hasPublicationYear "1964" @default.
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