Palaeoecology, taphonomy, and preservation of a lower Pliocene shell bed (coquina) from a volcanic oceanic island (Santa Maria Island, Azores)

被引：53

作者：

Avila, Sergio P. ^{[1
,3
,4
]}

Ramalho, Ricardo S. ^{[2
,5
,6
]}

Habermann, Joerg M. ^{[7
]}

Quartau, Rui ^{[8
,9
]}

Kroh, Andreas ^{[10
]}

Berning, Bjoern ^{[11
]}

Johnson, Markes ^{[12
]}

Kirby, Michael X. ^{[13
]}

Zanon, Vittorio ^{[14
]}

Titschack, Juergen ^{[15
]}

Goss, Adam ^{[16
]}

Rebelo, Ana Cristina ^{[2
,3
,4
]}

Melo, Carlos ^{[3
,19
]}

Madeira, Patricia ^{[2
,3
,4
]}

Cordeiro, Ricardo ^{[2
,3
,4
]}

Meireles, Ricardo ^{[2
,3
,4
]}

Bagaco, Leila ^{[3
,4
]}

Hipolito, Ana ^{[14
]}

Uchman, Alfred ^{[17
]}

da Silva, Carlos Marques ^{[9
,18
]}

Cachao, Mario ^{[9
,18
]}

Madeira, Jose ^{[9
,18
]}

机构：

[1] Univ Porto, Fac Ciencias, P-4100 Oporto, Portugal

[2] Polo Acores, CIBIO, Ctr Invest Biodiversidade & Recursos Genet, InBIO Lab Assoc, Azores, Portugal

[3] Univ Acores, Dept Biol, P-9501801 Ponta Delgada, Acores, Portugal

[4] Univ Azores, MPB Marine PalaeoBiogeog Working Grp, P-9501801 Azores, Portugal

[5] Univ Bristol, Sch Earth Sci, Bristol BS8 1RJ, Avon, England

[6] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

[7] Univ Erlangen Nurnberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany

[8] Inst Portugues Mar & Atmosfera IP, Div Geol Marinha & Georecursos, P-1749077 Lisbon, Portugal

[9] Univ Lisbon, Fac Ciencias, Inst Dom Luiz, P-1749016 Lisbon, Portugal

[10] Nat Hist Museum Wien, Geol Palaontol Abt, A-1010 Vienna, Austria

[11] Oberosterreich Landesmuseum, Geowissensch Sammlungen, A-4060 Leonding, Austria

[12] Williams Coll, Dept Geosci, Williamstown, MA 01267 USA

[13] Anacapa Paleo Resources, Santa Barbara, CA 93108 USA

[14] Univ Acores, Ctr Vulcanol & Avaliacao Riscos Geol, P-9501801 Ponta Delgada, Acores, Portugal

[15] Senckenberg Meer, Abt Meeresforsch, D-26382 Wilhelmshaven, Germany

[16] ExxonMobil Upstream Res, Houston, TX 77098 USA

[17] Jagiellonian Univ, Inst Geol Sci, PL-30063 Krakow, Poland

[18] Univ Lisbon, Fac Ciencias, Dept Geol, P-1749016 Lisbon, Portugal

[19] Univ Acores, Dept Geociencias, P-9501801 Ponta Delgada, Acores, Portugal

来源：

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY | 2015年 / 430卷

关键词：

Coquina; Sedimentary processes; Palaeoenvironmental reconstruction; Island shelves; Volcanic oceanic islands; Azores; MID-ATLANTIC RIDGE; SEA-LEVEL CHANGES; MADEIRA ARCHIPELAGO; ROCKY SHORELINES; INSULAR SHELVES; FAIAL ISLAND; EVOLUTION; LAST; SEDIMENTOLOGY; SYSTEMATICS;

D O I：

10.1016/j.palaeo.2015.04.015

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

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. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：57 / 73

页数：17

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