Facies and diagenesis of Triassic (Austrian alpine) and upper Permian (New Mexico-Texas) platform-margin carbonates: a comparison
Platform-margin carbonates of the Austrian Middle and basal Upper Triassic (Carnian) (Wettersteinkalk) and Upper Permian (Capitan reef, Guadalupian) are similar in terms of facies development, biota, and syndepositional diagenetic fabrics. These similarities are noteworthy because of their occurrence across the Permian-Triassic boundary, and the fact that these carbonates are distinct from younger (Upper Triassic Dachsteinkalk) depositional systems. The Upper Permian and Middle to basal Upper Triassic were deposited as subdued rimmed platforms with component lagoonal, reef-flat, reef, and fore-reef facies belts. The reef facies appear to represent upper slope marginal mounds, and consist mainly of sponges, solitary corals, Tubiphytes, and various encrusting biota; typically, this facies is pervasively marine cemented. The reef-flat facies consist of similarly lithified biograin-stones deposited in high-energy wave-base zones along the platform margins. By contrast, steep rimmed platforms with massive framework coral buildups and relatively less syndepositional marine cements dominate in Upper Triassic units (e.g., Dachsteinkalk, Steinplatte reef). Proximal fore-reef beds in the Upper Permian and Middle to basal Upper Triassic are characterized by carbonate-clast debris cemented by coarse crystalline carbonate. The precipitation of this cement (grossoolith) may have occurred during early shallow burial of the fore-reef beds. Similar depositional and diagenetic facies are poorly developed in the Upper Triassic, instead being represented mainly by bedded micrites.
- Research Organization:
- Wichita State Univ., KS (USA)
- OSTI ID:
- 6145993
- Report Number(s):
- CONF-880301-
- Journal Information:
- AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Vol. 72:2; ISSN AABUD
- Country of Publication:
- United States
- Language:
- English
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CARBONATE ROCKS
DEPOSITION
DIAGENESIS
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
GEOLOGY
MESOZOIC ERA
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NORTH AMERICA
PALEOZOIC ERA
PERMIAN PERIOD
REEFS
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SEDIMENTARY ROCKS
STRATIGRAPHY
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TRIASSIC PERIOD
USA