globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.12.028
论文题名:
Miocene-Pliocene rocky shores on São Nicolau (Cape Verde Islands): Contrasting windward and leeward biofacies on a volcanically active oceanic island
作者: Johnson M.E.; Ramalho R.S.; Baarli B.G.; Cachão M.; da Silva C.M.; Mayoral E.J.; Santos A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 395
起始页码: 131
结束页码: 143
语种: 英语
英文关键词: Coastal deposition ; Miocene ; Northeast Trade Winds ; Pliocene ; Rhodoliths (Rhodophyta) ; Volcanic islands
英文摘要: North Atlantic islands in the Cape Verde Archipelago off the coast of West Africa commonly feature an elongated N-S shape in which reduced northern coasts and longer eastern shores absorb the brunt of wave activity and long-shore currents generated by prevailing North East Trade Winds. Located in the middle windward islands, São Nicolau is unusual in profile with an elongated E-W configuration that offers a broad target against high-energy, wind-driven waves. Conversely, the south shore of São Nicolau provides relatively wide shelter in a leeward setting. Reconstruction of the proto-island prior to the onset of the Main Eruptive stage during the Late Miocene at ~. 5.1. Ma reveals a moderately smaller island with essentially the same E-W orientation. This study combines previous data with results from a detailed stratigraphic log based on Upper Miocene limestone deposits on the island's south flank for comparison with stratigraphic profiles of Upper Miocene limestone from the island's northeast quarter. Logs from a Pliocene sandy limestone outcropping on the south-central coast of São Nicolau give added context to the diversity of marine invertebrates, including branching coral colonies and delicate ramose bryozoans that found shelter in a leeward setting. Whole rhodoliths contribute the main fabric of carbonates deposited against rocky shores on the northern, exposed side of the Miocene island, whereas only traces of worn rhodoliths and rhodolith sand occur as in finer Miocene grainstone on the island's southern, protected side. Miocene and Pliocene carbonate deposits were terminated by submarine flows on an actively growing volcanic island. The passage zone from submarine to subaerial flows on the island's flanks makes a useful meter-stick to gauge absolute water depth at the moment of local extinction by volcanic activity. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69478
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geosciences, Williams College, Williamstown, MA 01267, United States; School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens's Road, Bristol BS8 1RJ, United Kingdom; Lamont-Doherty Earth Observatory at Columbia University, Comer Geochemistry Building, P.O. Box 1000, Palisades, NY 10964, United States; Faculdade de Ciências da Universidade de Lisboa, Departamento de Geologia e Centro de Geologia, Campo Grande, 1749-016 Lisboa, Portugal; 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

Recommended Citation:
Johnson M.E.,Ramalho R.S.,Baarli B.G.,et al. Miocene-Pliocene rocky shores on São Nicolau (Cape Verde Islands): Contrasting windward and leeward biofacies on a volcanically active oceanic island[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,395
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