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BENTHIC FORAMINIFERAL ASSEMBLAGES IN TEMPERATE CORAL-BEARING DEPOSITS FROM THE LATE PLIOCENE

2010; Cushman Foundation for Foraminiferal Research; Volume: 40; Issue: 1 Linguagem: Inglês

10.2113/gsjfr.40.1.61

1943-264X

José N. Pérez‐Asensio, Julio Aguirre,

Geological formations and processes

Research Article| January 01, 2010 BENTHIC FORAMINIFERAL ASSEMBLAGES IN TEMPERATE CORAL-BEARING DEPOSITS FROM THE LATE PLIOCENE J. Noel Pérez-Asensio; J. Noel Pérez-Asensio * Dpto. Estratigrafía y Paleontología, Facultad de Ciencias, Fuentenueva s/n. Universidad de Granada, 18002 Granada, Spain *Correspondence author. E-mail: jnoel@ugr.es Search for other works by this author on: GSW Google Scholar Julio Aguirre Julio Aguirre Dpto. Estratigrafía y Paleontología, Facultad de Ciencias, Fuentenueva s/n. Universidad de Granada, 18002 Granada, Spain Search for other works by this author on: GSW Google Scholar Author and Article Information J. Noel Pérez-Asensio * Dpto. Estratigrafía y Paleontología, Facultad de Ciencias, Fuentenueva s/n. Universidad de Granada, 18002 Granada, Spain Julio Aguirre Dpto. Estratigrafía y Paleontología, Facultad de Ciencias, Fuentenueva s/n. Universidad de Granada, 18002 Granada, Spain *Correspondence author. E-mail: jnoel@ugr.es Publisher: Cushman Foundation for Foraminiferal Research Received: 05 Dec 2008 Accepted: 24 Apr 2009 First Online: 03 Mar 2017 Online ISSN: 1943-264X Print ISSN: 0096-1191 © 2010 Journal of Foraminiferal Research Journal of Foraminiferal Research (2010) 40 (1): 61–78. https://doi.org/10.2113/gsjfr.40.1.61 Article history Received: 05 Dec 2008 Accepted: 24 Apr 2009 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J. Noel Pérez-Asensio, Julio Aguirre; BENTHIC FORAMINIFERAL ASSEMBLAGES IN TEMPERATE CORAL-BEARING DEPOSITS FROM THE LATE PLIOCENE. Journal of Foraminiferal Research 2010;; 40 (1): 61–78. doi: https://doi.org/10.2113/gsjfr.40.1.61 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract Foraminiferal and sedimentary analyses were performed on upper Pliocene exposures in the Almería-Níjar basin of southeastern Spain to determine its depositional history. The composite stratigraphic section reveals that, during the late Pliocene, a restricted coastal bay with coral banks was being filled with the siliciclastic sediments of prograding fan deltas. In the lower part of the Rambla Quebrada section, fine-grained sediments with Cibicides refulgens, Cibicidoides pseudoungerianus, Cibicidoides bradyi, Asterigerinata spp., Lobatula lobatula, Rosalina globularis, Textularia sp., Lenticulina calcar, and carinate elphidiids indicate deposition in a distal part of the bay where water depths were relatively deeper than those along the coast, and where the marine influence was greatest. Epiphytic species (i.e., Elphidium spp., Cibicides refulgens, Lobatula lobatula, Rosalina globularis, and Asterigerinata spp.) dominate in the lower part of the section and suggest that the distal substrate was densely vegetated. In contrast, the upper part of the Rambla Quebrada section is dominated by taxa characteristic of very shallow brackish environments, notably Ammonia spp. and noncarinate elphidiids. The relative abundance of epiphytic foraminiferal species decreases considerably up-section as a consequence of fan-delta progradation, which led to an increase in water turbidity and the influence of freshwater. Mud-dwellers (i.e., Reussella spinulosa and Nonion asterizans) inhabiting soft bottoms dominate in the middle-to-upper part of the studied sections. Here, Cancris auriculus, Nonion asterizans, and Cassidulina neocarinata are also locally abundant. These species are usually abundant on substrata with high contents of organic matter, which in this study could be attributed to the increased nutrient flow from the fan deltas prograding into the basin. Higher in the section, varve-like laminae that include species known to be tolerant of disoxia (i.e., Bulimina aculeata and Fursenkoina acuta) indicate that geomorphic restriction of the bay weakened the mixing of marine and fresh water, which allowed its water column to stratify and develop low-oxygen bottom conditions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.