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• W2182175719 abstract "At Site 764 of ODP Leg 122 on the Wombat Plateau (northernmost Exmouth Plateau), 210 m of Upper Triassic (Rhaetian) reefal complex was cored. This represents the first discovery of Triassic reefal material in the region of the Australian Northwest Shelf. Paleogeographic considerations suggest that Late Triassic reefs may be common elsewhere along the outer continental shelf and slope of the Northwest Shelf. The seismic sequences associated with the Rhaetian reefal interval on the northeastern flank of the Wombat Plateau are analyzed in relation to core samples from Sites 764 and 761, with a view to establishing the seismic characteristics of the reefal complex and the probability of the occurrence of other such complexes and investigating the history and depositional environments of the Rhaetian carbonate platform. Seismic-reflection data through Site 764 show that the reefal complex corresponds predominantly to a seismically poorly reflective zone. Traceable seismic horizons, which pass with reduced amplitude through the complex, correspond to regional unconformities formed by periods of erosion or nondeposition. Seismic facies around the flanks of the complex at Site 764 are consistent with the deposition of wedges of prograding reef-derived detritus or aprons of carbonate sediment deposited by current enhancement around the complex and with channeling and the formation of mounds or ridges near the complex. A comparison of features in the seismic-reflection data from the Wombat Plateau with the seismic characteristics of the reef complex at Site 764 suggests that there is probably a major Late Triassic carbonate reefal platform beneath the Wombat Plateau. Furthermore, many pinnacle reef complexes apparently developed on the northeastern margins of the plateau at that time. Seismic-reflection data tying Sites 764 and 761 allows the definition of three main seismic sequences separated by well-developed unconformities and associated with carbonate platform development in the Rhaetian. The lowest sequence (sequence A) contains seismic features that probably correspond to reefal complexes, reef-associated ramps of sediment, and channeling and formation of mounds or ridges in an open marine environment. Sequence B is similar in character to sequence A in the north. Its parallel reflection configuration in the south corresponds to a change from an open marine to lagoonal environment near Site 761. Sequence C displays gentle progradation to the north and is truncated between Sites 764 and 761. Although seismic sequences A, B, and C can be defined, their identification in sequence stratigraphic terms is more problematical due to relatively small amount of data. The geological data at Sites 761 and 764 suggest that sequence A may represent a transgressive systems tract, and sequences B and C represent highstand and transgressive systems tracts, respectively." @default.
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• W2182175719 date "1992-02-01" @default.
• W2182175719 modified "2023-10-16" @default.
• W2182175719 title "Seismic Characteristics of a Late Triassic Carbonate Reefal Platform on the Wombat Plateau, Australia" @default.
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• W2182175719 doi "https://doi.org/10.2973/odp.proc.sr.122.126.1992" @default.
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