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The AAPG/Datapages Combined Publications Database

Alaska Geological Society


Petroleum Geology of the 1002 Area, ANWR Coastal Plain, Alaska, 1987
Page 24

Depositional History of the Brookian Sequence, Sadlerochit Mountains Area, Arctic National Wildlife Refuge - Abstract

Mark A. Vandergon1


Detailed stratigraphic and sedimentologic analyses of Brookian sequence strata in the Sadlerochit Mountain area is important for reconstructing the depositional and tectonic history of this region. These data can be used to help evaluate the hydrocarbon potential in the Arctic National Wildlife Refuge coastal plain (1002 area).

The Brookian sequence in the Sadlerochit Mountain area was deposited during three distinct phases. During Previous HitPhaseNext Hit I the organic rich Hue Shale accumulated in a deep marine environment. The initial deposition of coarse terriginous clastic sediments in this area of the basin is recorded in Previous HitPhaseNext Hit II. Previous HitPhaseNext Hit II can be divided into five lithofacies which consist of varying amounts of interbedded sandstone, siltstone, minor amounts of conglomerate, and shale and are assigned to the Canning Formation. These sediments represent deposition by turbidity currents in submarine channel, channel levee, and interchannel environments. This association of environments is indicative of a mid-fan region on a submarine fan. In Previous HitPhaseNext Hit III, deltaic deposits of the Sagavanirktok Formation prograded across the area. Previous HitPhaseTop III sediments consist of poorly consolidated sandstones, carbonaceous material, and shale.

These three phases record; 1) onset of Brookian deposition in the area of the Sadlerochit Mountains, 2) progradation of coarse clastics into this portion of the basin from the southwest, and 3) subsequent filling of the basin by a progradational succession of marine to nonmarine environments.


Acknowledgments and Associated Footnotes

1 Mark A. Vandergon: AK. Div. of Geol. and Geophys. Surveys and The University of Alaska, Fairbanks, P.O. Box 82925, Fairbanks, AK 99708, (907) 474-7147

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