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Nature of sediment dispersal off the Sepik River, Papua New Guinea: preliminary sediment budget and implications for margin processes

Title: Nature of sediment dispersal off the Sepik River, Papua New Guinea: preliminary sediment budget and implications for margin processes.
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Name(s): Fugate, David, author
Kuehl, Steven A., author
Brunskillb, Gregg J., author
Burns, Kathy, author
Kniskern, Tara, author
Meneghini, Linda, author
Type of Resource: text
Genre: Article
Issuance: monographic
Date Issued: 2004-12-01
Extent: 1 online resource
Language(s): English
eng
Summary: A sediment budget is constructed for the slope and narrow continental shelf off the Sepik River in order to estimate the relative importance of turbid plumes versus bottom gravity transport through a near-shore submarine canyon in the dispersal of sediment across this collision margin. 210Pb geochronology and inventories of Kasten cores are consistent with the northwestward dispersal of sediment from the river mouth via hypopycnal and possible isopycnal plumes. Sediment accumulation rates are ∼5 cm yr−1 on the upper slope just off of the Sepik mouth, decreasing gradually to ∼1 cm yr−1 toward the northwest, and decreasing abruptly offshore (<0.2 cm yr−1 at 1200 m water depth). A sediment budget indicates that only about 7–15% of the Sepik River sediment discharge accumulates on the adjacent open shelf and slope. The remainder presumably escapes offshore via gravity flows through a submarine canyon, the head of which extends into the river mouth. The divergent sediment pathways observed off the Sepik River (i.e., surface and subsurface plumes versus sediment gravity flows through a canyon) may be common along high-yield collision margins of the Indo–Pacific archipelago, and perhaps are analogous to most margins during Late Quaternary low sea-level conditions.
Identifier: fgcu_ir_000997 (IID)
Note(s): The publisher's version of the article is available at https://doi.org/10.1016/j.csr.2004.07.016
Subject(s): Sediment budget
Sediment dispersal
Rivers.
Sepik River (Indonesia and Papua New Guinea)
Continental margins
Links: https://doi.org/10.1016/j.csr.2004.07.016
Persistent Link to This Record: http://purl.flvc.org/fgcu/fd/fgcu_ir_000997
Use and Reproduction: Copyright held by publisher.
Use and Reproduction: http://rightsstatements.org/vocab/InC/1.0/
Host Institution: FGCU
Has Part: Continental Shelf Research.