Geology of the Kodiak Shelf, Alaska: environmental considerations for resource development

Hampto, Monty A.

doi:10.1016/0278-4343(83)90027-4

Cited by 17 publications

(6 citation statements)

References 15 publications

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“…Nonetheless, the general picture that emerges is one of a narrow shallow-marine platform with large volumes of unstable volcanic and glacial debris subject to episodic resedimentation into deeper water, a setting welldocumented from glacially-influenced continental shelf edge and slope environments (e.g. Carlson & Molnia, 1977;Wright & Anderson, 1982;Hampton, 1983;Hill, 1984;Eyles, Eyles & Miall, 1985;Vorren er al., 1988; Fig. 12).…”

Section: Gaskiers Formationmentioning

confidence: 99%

Glacially‐influenced deep‐marine sedimentation of the Late Precambrian Gaskiers Formation, Newfoundland, Canada

Eyles

1989

Sedimentology

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The Late Proterozoic Conception Group, exposed on the Avalon Peninsula in Newfoundland, Canada, is a 4 km thick turbidite succession containing a conformable 300 m thick sequence of diamictites (the Gaskiers Formation) near the base. Massive and crudely‐stratified diamictites form beds up to 25 m thick which have a tabular geometry with slightly erosive basal contacts and are interbedded with mudstones and fine‐grained, thin‐bedded turbidites. These diamictites are interpreted as submarine debris flow deposits. Disrupted diamictites form strongly deformed units that contain large, complexly folded rafts of mudstone and turbidite facies. These diamictite units are interpreted as submarine slumps. Diamictites contain glacially‐striated and faceted clasts; clasts and matrix are predominantly of volcanic provenance. One outcrop shows interbedded volcanic agglomerate and diamictite, and volcanic bombs can also be identified. The interbedding of diamictites with turbidites and the stratigraphic context provided by the thick sequences of turbidites below (Mall Bay Formation) and above (Drook Formation) indicate a deep marine slope setting of diamictite deposition. Diamictite facies record remobilization and downslope transfer of large volumes of unstable volcanic and glacial debris initially deposited in a shallower water marginal marine zone. The regional tectonic framework suggests the Conception Group accumulated in a deep, southward‐opening ensialic rift basin with active but waning volcanic centres to the north. The Gaskiers Formation may be representative of other Late Precambrian glacially‐influenced diamictite sequences that were deposited around the North Atlantic region and in Europe. These deep marine diamictite sequences characterized by debris flows, turbidites, and slump deposits, can be contrasted with more extensive shallow marine shelf diamictite sequences found in association with dolomites and tidally influenced shallow water facies in other basinal settings.

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Section: Gaskiers Formationmentioning

confidence: 99%

Glacially‐influenced deep‐marine sedimentation of the Late Precambrian Gaskiers Formation, Newfoundland, Canada

Eyles

1989

Sedimentology

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“…West of the boundary, the Aleutian Islands rest on the narrow crest of the Aleutian Ridge, a mostly submerged mountain range bordered by deep water to the north and south (Vallier et al ., 1994). The submarine slopes of this ridge have a much greater depth range and more widespread rocky substrate than the seafloor in the eastern section, which is shallow, close to the continent, and blanketed by sediments deposited primarily during glacial periods (Hampton, 1983). The eastern section has some rocky substrates, but these are more patchily distributed than in the western section.…”

Section: Introductionmentioning

confidence: 99%

Corals of the Aleutian Islands

Heifetz¹,

Wing

Stone

et al. 2005

Fisheries Oceanography

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A unique feature of the benthic habitat in the Aleutian Islands is the presence of a highly diverse and abundant coral and sponge community. These communities likely provide important habitat for a variety of fish and invertebrate species. Summaries of historical data and recent direct observations with a submersible indicate that the Aleutian Islands may harbour the highest diversity and abundance of coldwater corals in the world. There are 69 documented taxa (species and subspecies) of coral in the Aleutians of which 25 are endemic. Within the Aleutian Islands, there is an increase in diversity of corals west of about longitude 169°W. This shift in diversity is consistent with the hypothesis of an ecological boundary in the vicinity of Samalga Pass. Given the endemism and high diversity and abundance of corals in the Aleutians, there is evidence that this region is the evolutionary centre of origin for some taxa of coldwater corals.

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“…GLORIA and other data show that the continental slope developing along this active margin is devoid of large submarine canyons, in spite of the presence of large glaciallyformed sea valleys that extend to the edge of the continental shelf (Carlson et al, 1982;Hampton, 1983). Much of the slope is incised only by relatively small canyons and cut by intensive gullying (fig.4).…”

Section: Gulf Of Alaska Continental Marginmentioning

confidence: 86%

GLORIA investigation of the exclusive economic zone in the Gulf of Alaska; MV Farnella Cruise F6-89-GA, May 16 to June 11, 1989

Carlson¹,

Mann²,

Huggett³

et al. 1990

Open-File Report

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Geology of the Kodiak Shelf, Alaska: environmental considerations for resource development

Cited by 17 publications

References 15 publications

Glacially‐influenced deep‐marine sedimentation of the Late Precambrian Gaskiers Formation, Newfoundland, Canada

Glacially‐influenced deep‐marine sedimentation of the Late Precambrian Gaskiers Formation, Newfoundland, Canada

Corals of the Aleutian Islands

GLORIA investigation of the exclusive economic zone in the Gulf of Alaska; MV Farnella Cruise F6-89-GA, May 16 to June 11, 1989

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