Submarine valleys in the northeastern Gulf of Alaska: Characteristics and probable origin

Carlson, Paul R.; Bruns, Terry R.; Molnia, Bruce F.; Schwab, William C.

doi:10.1016/0025-3227(82)90070-6

Cited by 58 publications

(30 citation statements)

References 10 publications

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“…The hazards include: 1. submarine slides and flows; 2. shallow faults; 3. gas-charged sediments; and 4. buried channels. Active faulting is well documented using conventional geophysical techniques (Bruns/ 1979(Bruns/ / 1982Bruns and Schwab, 1982;Carlson and Schwab, this report). Buried channels involve sediment and sedimentary rocks that are too deeply buried to be sampled with conventional coring equipment and therefore have not been studied in detail.…”

Section: Submarine Slides and Slumpsmentioning

confidence: 99%

“…These rocks can be correlated into the seismic data and underlie much of the shelf and slope (Plafker and others, 1982;Bruns unpublished data). Seismic reflection data and well control also show that strata coeval to the ^akataga Formation underlie the continental shelf and much of the slope of the Yakataga and Middleton segments (Bruns, 1979, Bruns andSchwab, 1982).…”

Section: Offshorementioning

confidence: 99%

“…The longest of these landward dipping reverse faults have been traced for about 30 km ( fig. 2; Bruns, 1979;Bruns and Schwab, 1982;Bruns and Plafker, this report). Many of these faults are covered by 5 to 10 m of Holocene sediment.…”

Section: Surface and Near-surface Faultsmentioning

confidence: 99%

“…These near-surface faults are related to the development of the deeper structures on the continental margin as shown by Bruns (1979) and Bruns and Schwab (1982).…”

Section: Surface and Near-surface Faultsmentioning

confidence: 99%

“…Several near-surface faults trend northeast-southwest parallel to the major Icy Bay structural trends (Bruns, 1979;Bruns and Schwab, 1982) ( fig. 4).…”

Section: Surface and Near-surface Faultsmentioning

confidence: 99%

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Hydrocarbon resource report for proposed OCS lease sale 88; southeastern Alaska, northern Gulf of Alaska, Cook Inlet, and Shelikof Strait, Alaska

1982

Open-File Report

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Section: Submarine Slides and Slumpsmentioning

confidence: 99%

Section: Offshorementioning

confidence: 99%

Section: Surface and Near-surface Faultsmentioning

confidence: 99%

“…These near-surface faults are related to the development of the deeper structures on the continental margin as shown by Bruns (1979) and Bruns and Schwab (1982).…”

Section: Surface and Near-surface Faultsmentioning

confidence: 99%

“…Several near-surface faults trend northeast-southwest parallel to the major Icy Bay structural trends (Bruns, 1979;Bruns and Schwab, 1982) ( fig. 4).…”

Section: Surface and Near-surface Faultsmentioning

confidence: 99%

See 3 more Smart Citations

Hydrocarbon resource report for proposed OCS lease sale 88; southeastern Alaska, northern Gulf of Alaska, Cook Inlet, and Shelikof Strait, Alaska

1982

Open-File Report

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Gulf of Alaska continental slope morphology: Evidence for recent trough mouth fan formation

Swartz

Gulick

Goff

2015

Geochem Geophys Geosyst

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Glaciated continental shelves are host to numerous morphologic features that help understand past glacier dynamics. Southeastern Alaska is home to the St. Elias mountains, an active orogen that also hosts temperate marine glaciers. During glacial periods ice streams advance across the continental shelf, carving shelf-crossing troughs that reach the shelf edge. We use high-resolution multibeam data to develop the relationship between the Yakutat and Alsek Sea Valleys and the resulting continental slope morphology. The shelf and slope geomorphology can be divided into statistical groupings that relate to the relative balance of erosion and deposition. Our analysis indicates that only the Yakutat system has been able to build an incipient trough-mouth fan. The extreme sediment supply from this region was able to overwhelm the steep initial topography of the transform margin while further to the east sediment slope-bypass dominates. This analysis provides an extreme end member to existing studies of temperate glaciation along continental margins. The unique interplay between rapid uplift due to ongoing collision and the massive erosion caused by temperate glaciers provides for sedimentary flux far above most other systems.

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Seismic stratigraphic evidence for glacial expanse during glacial maxima in the Yakutat Bay Region, Gulf of Alaska

Elmore

Gulick

Willems

et al. 2013

Geochem Geophys Geosyst

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[1] Modern shelf bathymetry bordering the Gulf of Alaska exhibits shelf-crossing sea valleys that suggest focused pathways for ice flow during glacial conditions. Using an integrated seismic data set between the present Yakutat and Alsek Sea Valleys, we investigate the glacial stratigraphic record in order to improve our understanding of the regional glacial system during maximum glacial conditions. Our investigations reveal four glacial unconformities, of which, the latter two are overlain by sediment packages hundreds of meters thick. We suggest that these unconformities are indicative of ice advance phases during the Little Ice Age (LIA), the Last Glacial Maxima (LGM), and two pre-LGM advances with glacial retreat sequences preserved from the youngest two. The advances were dominated by ice expanse from the Malaspina Glacial system and Alsek River districts rather than the Hubbard Glacial system and only show distinctive morainal bank development near the shelf edge and near the mouth of, or within, modern bays, fjords, or river valleys. This observation strongly supports rapid and continuous retreat from glacial maxima conditions during climatic warming. All, except the inferred LIA sequence, transgress the shelf and exhibit concentrated erosion in overdeepened troughs, analogous to cross-shelf troughs similar to those observed on other high-latitude glaciated shelves. The two Alaskan troughs discussed here may be end-member examples of high-sediment flux systems due to the temperate glacial setting combined with an actively exhuming orogen.

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Submarine valleys in the northeastern Gulf of Alaska: Characteristics and probable origin

Cited by 58 publications

References 10 publications

Hydrocarbon resource report for proposed OCS lease sale 88; southeastern Alaska, northern Gulf of Alaska, Cook Inlet, and Shelikof Strait, Alaska

Hydrocarbon resource report for proposed OCS lease sale 88; southeastern Alaska, northern Gulf of Alaska, Cook Inlet, and Shelikof Strait, Alaska

Gulf of Alaska continental slope morphology: Evidence for recent trough mouth fan formation

Seismic stratigraphic evidence for glacial expanse during glacial maxima in the Yakutat Bay Region, Gulf of Alaska

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