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Glacially influenced submarine-channel sedimentation in the Yakataga Formation, Middleton Island, Alaska

Carolyn H. Eyles
Glacially influenced submarine-channel sedimentation in the Yakataga Formation, Middleton Island, Alaska
Journal of Sedimentary Petrology (November 1987) 57 (6): 1004-1017

Abstract

The Yakataga Formation (Miocene to Recent) is a 5-km sequence of marine and glaciomarine sediments underlying a large area of the Gulf of Alaska continental shelf. The upper, early Pleistocene part of the formation, some 1.25 km thick, is exposed on Middleton Island. A 200-m-thick sequence of channelized sand and gravel lithofacies at the base of the exposed succession outcrops on extensive wave-cut platforms. These facies fill channels up to 500 m wide and 70 m deep and are associated with lenticular units of diamict. Eight major facies types are identified within the channel infills: chaotic gravel/diamict, massive gravels and sands, inversely and normally graded gravels and sands, and massive diamict. Channelized gravel and sand facies were deposited by different types of sediment-gravity flows, including debris flows, turbidity currents, and density-modified grain flows; lenticular diamict units probably formed by the passive infilling of abandoned channels by marine muds and ice-rafted debris. The facies described in this paper infill a broad submarine-channel complex, cutting the Alaskan continental shelf edge and upper slope. The complex was fed by glacial meltstreams draining a grounded or partially floating ice sheet extending out onto the continental shelf. This paper provides the first detailed descriptions of extensive outcrops of glacially influenced submarine-channel-fill facies and provides important data as to the infills of large sea valleys and submarine canyons in both glacially influenced and nonglacial settings elsewhere.


ISSN: 0022-4472
Coden: JSEPAK
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 57
Serial Issue: 6
Title: Glacially influenced submarine-channel sedimentation in the Yakataga Formation, Middleton Island, Alaska
Author(s): Eyles, Carolyn H.
Affiliation: McMaster Univ., Dep. Geol., Hamilton, ON, Canada
Pages: 1004-1017
Published: 198711
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 82
Accession Number: 1988-007281
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., chart, strat. cols., sketch maps
N51°00'00" - N72°00'00", W130°00'00" - E173°00'00"
N54°00'00" - N61°15'00", W163°00'00" - W135°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1988
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