The Faraoni event (latest Hauterivian) in ichnological record: The Río Argos section of southern Spain |
| |
| Institution: | 1. Departamento de Estratigrafía y Paleontología, Facultad de Ciencias, Universidad de Granada, 18002 Granada, Spain;2. Institute of Geological Sciences, Jagiellonian University, Gronostajowa 3a, 30-387 Kraków, Poland;1. Laboratorio de Biostratigrafía “Dr. Eduardo Musacchio”, Departamento de Geología, Universidad Nacional de la Patagonia San Juan Bosco, Ciudad Universitaria km. 4, 9000 Comodoro Rivadavia, Argentina;2. Departament de Dinàmica de la Terra i de l’Oceà, Facultat de Geologia, Universitat de Barcelona-UB, 08028 Barcelona, Catalonia, Spain;1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Department of Geological Sciences, Freie Universität Berlin, Malteserstr. 74-100, 12249 Berlin, Germany;3. China University of Geosciences, Beijing 100083, China;4. Faculty of Earth Sciences, University of Iceland, Sturlugata 7, Askja, 101 Reykjavík, Iceland;1. University of Manchester, School of Earth and Environmental Sciences, North Africa Research Group, M13 9PL Manchester, UK;2. Aix Marseille Université, CNRS, IRD, Coll France, CEREGE, Aix-en-Provence, Site Saint-Charles – Case 67 – 3, Place Victor Hugo, 13331 Marseille Cedex 3, France;3. Groupement d''Intérêt Paléontologique, Science et Exposition, 60 bd Georges Richard, 83000 Toulon, France;4. Université Ibn Zohr, Faculté des Sciences, Département de Géologie, Laboratoire de Géologie Appliquée et Géo-Environnement (LAGAGE), B.P 8106 Cité Dakhla, Agadir, Morocco;1. Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, Coyoacán, 04510, Mexico;2. Calle Emiliano Zapata #112, Revolución, 93390, Poza Rica, Veracruz, Mexico;3. Groupement d''Intérêt Paléontologique, Science et Exposition, 60 bd Georges Richard, 83000 Toulon, France;4. Department of Earth Sciences, 13 Rue des Maraîchers, 1205 Geneva, Switzerland;5. Universidad Autónoma de Nuevo León, Facultad de Ciencias de la Tierra Ex – Hacienda de Guadalupe, Linares, N.L., A.P. 104, C.P. 67700, Mexico;6. Centro de Investigaciones Biológicas, Universidad Autónoma del Estado de Hidalgo, Pachuca, 42184, Mexico;1. Ruhr-Universität Bochum, Institut für Geologie, Mineralogie und Geophysik, D-44870 Bochum, Germany;2. Aarhus University, Department of Geoscience, Høegh-Guldbergs Gade 2, 8000 Aarhus C, Denmark;3. Departament de Geologia (Paleontologia), Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;1. Université de Tunis El Manar II, Faculté des Sciences de Tunis, UR11 ES15, C.P. 2092, Tunis, Tunisia;2. Université de Sfax, Faculté des Sciences de Sfax, Lab. 3E, CP 3038, Sfax, Tunisia;3. Département de la Géologie, Office National des Mines, 24 rue de l′énergie 2035 la Charguia, BP.215, 1080, Tunis cedex, Tunisia;4. Université de Sfax, Faculté des Sciences de Sfax, C.P. 3038, Sfax, Tunisia;5. Université de Sfax, Faculté des Sciences de Sfax, LR99ES34, C.P. 3038, Sfax, Tunisia;6. Departament de Dinàmica de la Terra i de l''Oceà, Facultat de Geologia, Universitat de Barcelona-UB, E-08028, Barcelona, Catalonia, Spain |
| |
| Abstract: | The Early Cretaceous (latest Hauterivian) Faraoni Oceanic Anoxic Event (F-OAE) in the Río Argos section (Caravaca region, southern Spain), the candidate for the Global Boundary Stratotype Section and Point (GSSP) of the Hauterivian–Barremian transition, has been studied. Its ichnological bed-by-bed analysis allows for interpretation of oxygenation changes through the Faraoni Level interval and improvement upon previous characterization of oxygen conditions prior, during and after the F-OAE. The trace fossil assemblage belongs to the Zoophycos ichnofacies and it includes Chondrites intricatus, Chondrites targionii, Halimedides isp., Palaeophycus isp., ?Patagonichnus isp., Planolites isp., Rhizocorallium isp., Taenidium isp., Thalassinoides isp., Trichichnus linearis, Zavitokichnus fusiformis, and Zoophycos isp. Their diversity in particular beds fluctuates. Beds with four to six ichnotaxa reflect a multi-tiered macrobenthic trace maker assemblage living in good oxic and trophic conditions. In one bed below and one bed above the Faraoni Level (both marls without primary lamination), there are only two or three, mostly opportunistic ichnotaxa (Trichichnus, Chondrites, Planolites). They record dysoxic conditions. At the base of the Faraoni Level, one thicker and two thinner beds of marly mudstones (21.2 and 3.5 cm thick, respectively) are characterized by primary lamination. At the top and in the basal part of the thicker bed and in the thinner beds some trace fossils are present. These beds were deposited under anoxic conditions and later colonized by trace makers either from overlying beds deposited under oxic conditions or from the level of a greenish lamina in the lower part of the thicker bed, recording short episodes of dysoxic conditions. The thinner anoxic beds are separated by marls deposited under dysoxic conditions. |
| |
| Keywords: | Faraoni Oceanic Anoxic Event Hauterivian Trace fossils Palaeoecology Río Argos section Spain |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
