期刊
RENDICONTI ONLINE DELLA SOCIETA GEOLOGICA ITALIANA
卷 59, 期 -, 页码 49-55出版社
SOC GEOLOGICA ITALIANA
DOI: 10.3301/ROL.2023.08
关键词
carbonate platform; pennulate corals; Late Triassic; stressed environment
In a Norian-Rhaetian carbonate system of the Western Tethys realm in North Calabria, a stratigraphic section through the margin setting of the early-middle Norian depositional unit was investigated. The section shows a trend of facies evolving from isolated microbial and skeletal boundstones to patch reefs and coarser breccias composed of reef-derived clasts. The presence of specific biota and pennulate corals suggests a stressed environment with shallow water deposition.
In a Norian-Rhaetian carbonate system of the Western Tethys realm, cropping out in the Monte Cocuzzo tectonic window (North Calabria), a stratigraphic section through the margin setting of the early-middle Norian depositional unit was investigated. The section shows a trend of facies, starting with scattered small-scale isolated microbial and skeletal boundstones (corals, algae, sponges) interbedded with bioclastic/peloidal packstones and grainstones, evolving toward meter-scale, patch reefs and coarser breccias composed of reef-derived clasts. Globose clusters of sponges (Olangocoeliidae), encrusting red algae (Solenopora) and microbial crusts, all binding peloidal-bioclastic packstones, represent the starting-phase of the bioconstruction, followed by the progressive increasing two genus of pennulate corals: Retiophyllia sp. (colonial) and Distichophyllia sp. (isolate). The oligotypic biota assemblage and the presence of pennulate corals, indicate a shallow water environment of deposition, underneath the fair-weather wave-base depth, characterized by stressed environmental conditions with disphotic and eutrophic waters.
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