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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Origin and Distribution of Holocene Temperate Carbonates, Hecate Strait, Western Canada Continental Shelf
John S. Carey (1), Thomas F. Moslow (2), J. Vaughn Barrie (3)
ABSTRACT
4000 km2 in Hecate Strait, western Canada continental shelf,
are composed predominantly of CaCO3. The deposit is Holocene
and forms a discontinuous unit consisting of coarse shell debris, typically
< 1 m thick, overlying Tertiary bedrock. Carbonate sediments are largely
restricted to water depths of < 50 m and are closely associated with
rock and gravel substrates. The faunas yielding these sediments are predominantly
bivalves, barnacles, and bryozoans. Radiocarbon dates on surficial material
range from modern to 1500 yr B.P. Vigorous water circulation through tidal
and wave action, combined with rocky or coarse-grained substrates in some
areas, favors suspension-feedin biogenic carbonate producers. The presence
of carbonates in Hecate Strait results from the glacial and postglacial
history of the region. Glaciation and subsequent subaerial erosion produced
abundant rock and gravel substrates; subsequent transgression starved the
region of terrigenous clastic sediments.
Carbonate sedimentation on high-latitude continental shelves is restricted
to areas where conditions favorable to production of biogenic carbonate
coexist with low supply of terrigenous sediment. High-amplitude fluctuations
of sea level, such as those produced during glaciations, may favor development
of temperate carbonates during transgressive and highstand intervals.
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