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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
A Carbonate Submarine-Fan Sequence from the Jurassic of Portugal
V. Paul Wright, R. C. L. Wilson
ABSTRACT
A prograding, carbonate submarine-fan sequence is described from the Toarcian-Aalenian of western Portugal. The sequence is predominantly composed of shallow-water carbonate grains but can be interpreted using the current siliclastic submarine-fan models. Basin-plain to outer-fan, braided-channel midfan, and large channel-fill sequences can be recognized. The source of the carbonate grains was a platform developed on an uplifted Hercynian horst to the west of present mainland Portugal. The fan sequence overlies restricted basin deposits with organic-rich mudstones and shales. This association of restricted basin facies and a thick (over 300 m) carbonate grainstone could be an attractive hydrocarbon play. However, such limestone sequences are easily misinterpreted as in situ shelf carb nates.
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