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Late Quaternary glacial dynamics and sedimentation variability in the Bering Trough, Gulf of Alaska Available to Purchase
CONTROLS ON GLACIAL-MARINE ACCUMULATION RATES IN THE YAKATAGA FORMATION, GULF OF ALASKA Available to Purchase
Accumulation rates are calculated for the Yakataga Formation in the northern Gulf of Alaska in order to understand the controls on glacial-marine sedimentation along an active continental margin. Geometries of depositional sequences within the Yakataga are the function of the complex interplay between sediment supply, eustasy, and tectonics. An increase in accumulation rates through time is documented for the entire formation using data from lowermost Yakataga outcrops at Yakataga Reef and for six sequences within the offshore Yakataga Fm. Accumulation rates are low in the lowermost Y akataga Fm. (hundreds of m/my), but then increase to several thousands of m/my at 2.5 Ma which corresponds to the onset of regional North Pacific glaciation. Younger offshore Y akataga sections (< 1 Ma) have accumulation rates from 2000 to > 6000 m/my. This increase in accumulation rates is due to a combination of increased subsidence and the intensification of glacial-marine conditions as the uplift of the Chugach and St. Elias Ranges continued through time. Subsidence, which creates accommodation space on the margin, may be the primary control; however, additional studies are needed to quantify the amounts of tectonic and loading subsidence and to estimate the influences of the other controls.