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- W2293230269 abstract "Abstract The upper Neocomian (Hauterivian) Kemik Sandstone crops out extensively in the Sadlerochit and Shublik Mountains area of the Arctic National Wildlife Refuge (ANWR). It is composed of very fine grained quartzarenite that averages 30 m. thick and is a potential hydrocarbon exploration objective in ANWR. Detailed studies have identified two members: 1) the Ignek Valley Member, a cross-bedded sandstone facies that trends east north-east, and 2) the Marsh Creek Member, a burrowed pebbly siltstone facies. The two members appear to have been deposited in geographically distinct areas, however, in the eastern Sadlerochit Mountains area, the Ignek Valley and Marsh Creek Members are telescoped along a system of thrust faults. These faults also juxtapose other contrasting Cretaceous lithofacies. Detailed mapping and facies studies show that the Kemik rests on a regional mid-Neocomian unconformity above progressively older formations to the north. Facies relationships, sedimentary structures, and megafossils suggest that the Ignek Valley Member was deposited on a shallow-marine shelf as a series of strand oblique sand ridges, some of which developed into barrier bar to beach environments. Deposition was dominated by vertical accretion. We recognize six lithofacies in the Kemik Sandstone: 1) a basal conglomerate, 2) an interbedded rippled and bioturbated sandstone, 3) a burrowed sandstone, 4) a cross-bedded sandstone, 5) a bioturbated sandstone, and 6) interbedded siltstone and mudstone. Lithofacies 1 and 2 are interpreted as deposits of storm currents in the ridge margin environment. Lithofacies 3 and 4 are interpreted to have formed in the ridge crest environment as the sand ridges shoaled above fairweather wave base. The size and distribution of distinctive tripolitic chert pebbles in lithofacies 1-4 suggest that sediment was derived from the northeast and transport was to the southwest. At their thickest development, lithofacies 5 and 6 constitute the Marsh Creek Member. These facies may have been deposited below fairweather wave base and record subsidence of the shelf and burial of the sand ridges. Alternatively, lithofacies 5 and 6 may record deposition in lagoonal environments landward of a barrier bar or spit." @default.
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- W2293230269 date "1987-01-01" @default.
- W2293230269 modified "2023-09-23" @default.
- W2293230269 title "The Kemik Sandstone, Arctic National Wildlife Refuge, Northeastern Alaska - Abstract" @default.
- W2293230269 hasPublicationYear "1987" @default.
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