globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.04.015
论文题名:
Palaeoecology, taphonomy, and preservation of a lower Pliocene shell bed (coquina) from a volcanic oceanic island (Santa Maria Island, Azores)
作者: Ávila S.P.; Ramalho R.S.; Habermann J.M.; Quartau R.; Kroh A.; Berning B.; Johnson M.; Kirby M.X.; Zanon V.; Titschack J.; Goss A.; Rebelo A.C.; Melo C.; Madeira P.; Cordeiro R.; Meireles R.; Bagaço L.; Hipólito A.; Uchman A.; da Silva C.M.; Cachão M.; Madeira J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 430
起始页码: 57
结束页码: 73
语种: 英语
英文关键词: Azores ; Coquina ; Island shelves ; Palaeoenvironmental reconstruction ; Sedimentary processes ; Volcanic oceanic islands
英文摘要: Massive fossil shell accumulations require particular conditions to be formed and may provide valuable insights into the sedimentary environments favouring such concentrations. Shallow-water shell beds appear to be particularly rare on reefless volcanic oceanic islands on account of narrow, steep and highly-energetic insular shelves where the potential for preservation is limited. The occurrence of an exceptional coquina (Pedra-que-pica) within the Miocene-Pliocene deposits of Santa Maria Island (Azores), therefore provides a rare opportunity to understand the conditions that led to the formation and preservation of a massive shell bed at mid-ocean insular setting. This study provides a detailed analysis regarding a 10-11-m-thick bivalve-dominated fossil assemblage exposed at Pedra-que-pica on Santa Maria Island in the Azores. Integration of taphonomical, palaeoecological and sedimentological observations are used to reconstruct the genesis of the coquina bed and related events, and to discuss why such exceptional sedimentary bodies are so rare on shelves around reefless volcanic oceanic islands.The sequence at Pedra-que-pica demonstrates a complex succession of sedimentary environments in response to the drowning of an existing coastline during a period of rapid sea-level rise. The Pedra-que-pica shell bed incorporates storm-related materials and possible debris falls that originated nearby in a shallow and highly productive carbonate factory. Deposition took place below fair-weather wave base, at around 50. m depth, as inferred from the overlying volcanic succession. The preservation of this coquina was favoured by deposition on a platform laterally protected by a rocky spur, combined with rapid burial by water-settled volcanic tuffs and subsequent volcanic effusive sequences. The recent exhumation of the deposit is the result of island uplift and subsequent erosion. © 2015 Elsevier B.V.
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被引频次[WOS]:47   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68913
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作者单位: Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, Porto, Portugal; CIBIO, Centro de Investigaçao em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Açores, Portugal; Departamento de Biologia, Universidade dos Açores, Ponta Delgada, Açores, Portugal; MPB-Marine PalaeoBiogeography Working Group of the University of the Azores, Rua da Mãe de Deus, Portugal; School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, United Kingdom; Lamont-Doherty Earth Observatory at Columbia University, Comer Geochemistry Building, 61 Route 9 W/PO box 1000, Palisades, NY, United States; GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Schloßgarten 5, Erlangen, Germany; Divisão de Geologia Marinha e Georecursos, Instituto Português do Mar e da Atmosfera I.P., Rua C do Aeroporto, Lisboa, Portugal; Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Edifício C8, Piso 3, Lisboa, Portugal; Naturhistorisches Museum Wien, Geologisch-Paläontologische Abteilung, Burgring 7, Wien, Austria; Oberösterreichisches Landesmuseum, Geowissenschaftliche Sammlungen, Welser Str. 20, Leonding, Austria; Department of Geosciences, Williams College, Williamstown, MA, United States; Anacapa Paleo Resources, 363 Woodley Road, Santa Barbara, CA, United States; Centro de Vulcanologia e Avaliação de Riscos Geológicos, Universidade dos Açores, Ponta Delgada, Açores, Portugal; Senckenberg am Meer, Abteilung Meeresforschung, Südstrand 40, Wilhelmshaven, Germany; ExxonMobil Upstream Research, 3120 Buffalo Speedway, Houston, TX, United States; Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, Kraków, Poland; Departamento de Geologia, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal; Departamento de Geociências, Universidade dos Açores, Ponta Delgada, Açores, Portugal

Recommended Citation:
Ávila S.P.,Ramalho R.S.,Habermann J.M.,et al. Palaeoecology, taphonomy, and preservation of a lower Pliocene shell bed (coquina) from a volcanic oceanic island (Santa Maria Island, Azores)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,430
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