Tectonism and Eustacy in Devonian Reef Complexes of the
Hocking, Roger M.1, Phillip E.
Playford2 (1) Geological Survey of
Platform limestones
in Frasnian and Famennian
reef complexes of the
Siliciclastic conglomerates interfinger with and cut through reefal carbonates at platform and basin levels, and less commonly on marginal slopes. They span many metre-scale cycles, from both point and line sources. Two major conglomerate outpourings are apparent, each during periods of marginally greater platform accommodation, one Frasnian and one Famennian. Deposition extended well into basinal areas on the southeast and northwest Lennard Shelf in the Frasnian and Famennian respectively, indicating variability in timing and provenance. Shallowing-upward conglomerate cyclicity is present in one area, with cycles averaging 12 m thick. The conglomerates are attributed to major tectonic pulses, and the cycles to orbital forcing
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California