|
|||||
|
|
The Middle Jurassic radiolarites and pelagic limestones of the Nieves unit (Rondaide Complex, Betic Cordillera): basin starvation in a rifted marginal slope of the western Tethys |
|
| Authors: | Luis O'Dogherty Agustín Martín-Algarra Hans-Jürgen Gursky Roque Aguado |
| Institution: | Departamento de Geología, Facultad de Ciencias del Mar, Universidad de Cádiz, 11510 Puerto Real, Spain, Departamento de Estratigrafía y Paleontología, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain, Institut für Geologie und Pal?ontologie, Technische Universit?t Clausthal, 38678 Clausthal-Zellerfeld, Germany, Departamento de Geología, Escuela Universitaria Politécnica de Linares, Universidad de Jaén, Alfonso X El Sabio 28, 23700 Linares, Jaén, Spain, |
| Abstract: | Middle Jurassic radiolarites and associated pelagic limestones occur in the Rondaide Nieves unit of the Betic Cordillera, southern Spain. The Rondaide Mesozoic includes: (a) a thick succession of Triassic platform carbonates, comparable to the Alpine Hauptdolomit and Kössen facies; (b) Lower Jurassic pelagic limestones comparable to the Alpine Hierlatz and Adnet facies; (c) the Middle Jurassic Parauta Radiolarite Formation, described herein; and (d) a thin Upper Jurassic-Cretaceous condensed limestone succession. The Parauta Radiolarite Formation and associated limestones were studied with respect to stratigraphy, petrography, micropalaeontology (radiolarians, calcareous nanno- and microfossils) and facies. Radiolarite sedimentation occurred in the Middle Bathonian in a restricted and dysoxic deep Nieves basin, perched in the distal zone of a continental margin fringing the Tethyan ocean. This margin was adjacent to a young narrow oceanic basin between the South-Iberian margin and a continental block called Mesomediterranean Terrane. The Nieves basin was part of a marine corridor between the Proto-Atlantic and Piedmont-Ligurian basins of the Alpine Tethys. The regional tectonic position, the stratigraphical evolution since the Triassic, the age and the nature of the Mesozoic facies and the palaeogeographic relations to adjacent domains show striking analogies between the Betic Rondaide margin and coeval units of the Alps. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |