Foraminiferal taphofacies in the Mississippian rocks of the Guadiato area, SW Spain |
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Authors: | Pedro Cozar |
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Institution: | (1) Department of Geology, University College Dublin, Belfield, Dublin 4, Ireland;(2) Present address: Facultad de Ciencias Geológicas, Departmento de Palaeontología, Universidad Complutense de Madrid, Ciudad Universitaria s/n., 28040 Madrid, Spain |
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Abstract: | Summary Microfacies analysis of over 1800 standard thin-sections of upper Viséan and Pendleian-aged platform limestones from southwestern
Spain (Guadiato area) shows that foraminiferal assemblages contain many allochthonous specimens. The analysis of the cementation,
recrystallization, abrasion, bioerosion, encrustation, dissolution, taphonomic distortion, orientation and sorting allow the
recognition of eight taphofacies. They are based on the taphonomic features observed within the foraminiferal assemblages,
which reflect the environmental conditions in which foraminifera were sedimented as well as about early diagenesis. The environmental
conditions may be ascertained from the analysis of the biostratinomic processes, which comprise the energy, waves, tides,
redox conditions, etc. The mechanisms of taphonomic alteration may be quantified, and thus the appearance or absence of these
alterations may be used to define taphofacies of shallow- and deep-water environments, such as those from tidal flat, shoal,
outer platform, microbial mound or slope. Moreover, the relationship among these taphofacies also helps to define depositional
mechanisms and products, such as debris flows or olistolites. |
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Keywords: | Endothyroids Foraminifera Taphonomy Biostratinomy SW spain Mississippian Carboniferous |
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