DOI: 10.1016/j.palaeo.2013.04.014
论文题名: Ichnology in oceanic islands; case studies from the cape verde archipelago
作者: Mayoral E. ; Ledesma-Vazquez J. ; Baarli B.G. ; Santos A. ; Ramalho R. ; Cachão M. ; da Silva C.M. ; Johnson M.E.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 381-382 起始页码: 47
结束页码: 66
语种: 英语
英文关键词: Cape Verde Islands (Santiago Maio and São Nicolau)
; Macaronichnus-Dactyloidites ichnoassociation
; Proximal Cruziana ichnosubfacies
; Skolithos ichnofacies
; Thalassinoides ichnoassociation
; Trace fossils
英文摘要: Miocene and Pleistocene marine deposits in the Cape Verde Archipelago are represented by a series of thin, transgressive sandy-bioclastic limestones that typically occur between subaerial and/or submarine volcanic flows. This position within volcanic flows makes them an ideal paleobathymetric case study, because the submarine/subaerial passage zone above them provides a reliable and independent indicator of paleodepth. In terms of paleoichnology, the older Miocene sediments are characterized by the Thalassinoides ichnoassociation, whereas, Pleistocene sediments are characterized by the Macaronichnus-. Dactyloidites ichnoassociation.The fair-weather suite of the proximal Cruziana ichnosubfacies is represented by the ichnotaxa Dactyloidites, Bichordites, Cardioichnus, Phycodes, Teichichnus, aff. Taenidium, Palaeophycus and Thalassinoides in addition to the Thalassinoides ichnoassociation.The Macaronichnus-. Dactyloidites ichnoassociation is more complex, including representatives of both the proximal Cruziana and Skolithos ichnofacies. Only representatives of the Skolithos ichnofacies (Skolithos, Macaronichnus, Conichnus and Ophiomorpha) are represented in the post-storm suite.So far, bioerosive structures were found on the Miocene/Pleistocene unconformity surface of Maio Island, and on basaltic paleocliffs at Ponta das Bicudas, on Santiago Island. They are represented by the ichnoassemblage Gastrochaenolites torpedo-. Entobia isp., corresponding to the Entobia ichnofacies.Bathymetric calibration deduced from the position of the following passage zone between submarine and sub-aerial lava flow allows for confirmation of the proximal Cruziana ichnosubfacies and Skolithos ichnofacies at a paleodepth between 12 and 18. m depth. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69723
Appears in Collections: 过去全球变化的重建
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作者单位: Departamento de Geodinámica y Paleontología, Facultad de Ciencias Experimentales, Universidad de Huelva, Campus de El Carmen, Avda. 3 de Marzo, s/n, 21071 Huelva, Spain; Facultad de Ciencias Marinas, Universidad Autónoma de Baja California, Ensenada, BC 22800, Mexico; Department of Geosciences, Williams College, Williamstown, MA 01267, United States; Institut für Geophysik, Westphälishe-Wilhelms Universität, Corrensstraße 24, 48149 Münster, Germany; Faculdade de Ciências da Universidade de Lisboa, Departamento de Geologia e Centro de Geologia, Campo Grande, 1749-016 Lisboa, Portugal
Recommended Citation:
Mayoral E.,Ledesma-Vazquez J.,Baarli B.G.,et al. Ichnology in oceanic islands; case studies from the cape verde archipelago[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,381-382