Environmental geology of Harrison Bay, northern Alaska

Craig, Jessica; Thrasher, Glenn P.

doi:10.3133/ofr8235

Cited by 6 publications

(32 citation statements)

References 1 publication

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“…Acoustic stratigraphy extends the Gubik Formation to the offshore of Harrison Bay. Craig and Thrasher (1982) tentatively identified three acoustic sequences in Harrison Bay that may correlate to the sequences observed by Reimnitz et al (1972). A low angle unconformity observed on common depth point (CDP) profiles at a depth of 100 m represents the inferred base of the Gubik Formation (Craig and Thrasher, 1982).…”

Section: Offshore Quaternary Acoustic Stratigraphymentioning

confidence: 78%

“…Craig and Thrasher (1982) tentatively identified three acoustic sequences in Harrison Bay that may correlate to the sequences observed by Reimnitz et al (1972). A low angle unconformity observed on common depth point (CDP) profiles at a depth of 100 m represents the inferred base of the Gubik Formation (Craig and Thrasher, 1982). Craig and Thrasher (1982) recognized the upper boundary of the Pleistocene in interpretations of 3.5 kHz profiles.…”

Section: Offshore Quaternary Acoustic Stratigraphymentioning

confidence: 81%

“…rovince indicate a fairly well preserved rbed non-marine alluvial, fluvial, eolian, de an understanding of Quaternary seainvestigated to determine the position lave peaked below the present sea-level Investigations using high-resolution acoust Formation to the Beaufort Sea shelf (Reimnitz et al, 1977;Craig and Thrasher, 1982;Dinter, Reimnitz et al (1972) identified three ac Simpson Lagoon. The inferred Pleistocene sequ formably overlies the Tertiary Sagavanirktok the stratigraphy of Howitt (1971) by tying struct holes.…”

Section: Offshore Quaternary Acoustic Stratigraphymentioning

confidence: 99%

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Quaternary acoustic stratigraphy between the Colville River and Prudhoe Bay, Beaufort Sea Shelf, Alaska

Foster¹

1988

Open-File Report

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This report is derived from my graduate studies at the University of Alaska. The research was done as partial fulfillment of a M.S. degree in Oceanography in the Graduate Program of Marine Science and Limnology. I convey my since appreciation to Dr. A. Sathy Naidu for providing the opportunity to attend graduate school and for chairing my advisory committee. I thank him for giving me guidance during my studies. I am grateful for the advice and support that committee members Dr.

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Section: Offshore Quaternary Acoustic Stratigraphymentioning

confidence: 78%

Section: Offshore Quaternary Acoustic Stratigraphymentioning

confidence: 81%

Section: Offshore Quaternary Acoustic Stratigraphymentioning

confidence: 99%

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Quaternary acoustic stratigraphy between the Colville River and Prudhoe Bay, Beaufort Sea Shelf, Alaska

Foster¹

1988

Open-File Report

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“…PLR on the Central U.S. Beaufort shelf occur primarily within mostly sand‐rich sedimentary deposits of the Sagavanirktok Formation [ Molenaar et al , 1986]. Based on depth, the few shallow PLRs (<60 m below the seafloor) are within the overlying Gubik Formation [ Craig and Thrasher , 1982]. The sand‐rich Sagavanirktok sediments host both ice and gas hydrates onshore, and the base of the formation's ice‐bearing strata closely approximates the 0°C isotherm and is easily detected in well logs [ Collett , 1993].…”

Section: Discussionmentioning

confidence: 99%

Minimum distribution of subsea ice‐bearing permafrost on the U.S. Beaufort Sea continental shelf

Brothers

Hart

Ruppel

2012

Geophysical Research Letters

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[1] Starting in Late Pleistocene time ($19 ka), sea level rise inundated coastal zones worldwide. On some parts of the present-day circum-Arctic continental shelf, this led to flooding and thawing of formerly subaerial permafrost and probable dissociation of associated gas hydrates. Relict permafrost has never been systematically mapped along the 700-km-long U.S. Beaufort Sea continental shelf and is often assumed to extend to $120 m water depth, the approximate amount of sea level rise since the Late Pleistocene. Here, 5,000 km of multichannel seismic (MCS) data acquired between 1977 and 1992 were examined for high-velocity (>2.3 km s À1 ) refractions consistent with ice-bearing, coarse-grained sediments. Permafrost refractions were identified along <5% of the tracklines at depths of $5 to 470 m below the seafloor. The resulting map reveals the minimum extent of subsea ice-bearing permafrost, which does not extend seaward of 30 km offshore or beyond the 20 m isobath.

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“…This dual orientation was interpreted (10) as evidence that there may be a second forcing mechanism on gouging ice in Harrison Bay, aside from the force of the offshore pack ice as described above. The second forcing mechanism was identified as wind and currents pushing isolated pieces of ice toward the southeast during summer (10).…”

Section: Ice Gouges In Harrison Baymentioning

confidence: 99%

Estimated ice-gouge rates on a manmamde shoal in the Beaufort Sea

Newbury¹,

Adams²

OCEANS '88. 'A Partnership of Marine Interests'. Proceedings

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In 1987, slope-protection fabric was removed from the top of an artificial gravel island in Harrison Bay, southwestern Beaufort Sea.As a result, currents began to erode the island's top. After it is eroded to a subsurface shoal, ice keels will slowly gouge and disrupt the remaining shoal. This paper analyzes the ice-gouge process and estimates the rate of sediment disruption by gouges. The rate is derived from existing information on gouges in the surrounding seafloor in Harrison Bay and for a time when the shoal is at half of the water depth (-7.5 m).It is estimated that ice keels will typically disrupt 1 vertical meter of the whole surface of the shoal within a period of about 2 decades.

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Environmental geology of Harrison Bay, northern Alaska

Cited by 6 publications

References 1 publication

Quaternary acoustic stratigraphy between the Colville River and Prudhoe Bay, Beaufort Sea Shelf, Alaska

Quaternary acoustic stratigraphy between the Colville River and Prudhoe Bay, Beaufort Sea Shelf, Alaska

Minimum distribution of subsea ice‐bearing permafrost on the U.S. Beaufort Sea continental shelf

Estimated ice-gouge rates on a manmamde shoal in the Beaufort Sea

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