BENTHIC FORAMINIFERAL BIOFACIES IN TEMPERATE CARBONATE SEDIMENT IN THE WESTERN PONTINE ARCHIPELAGO (TYRRHENIAN SEA, ITALY)
Recent foraminiferal assemblages are identified in 70 grab samples from 20-380 m depth in the Pontine Archipelago (Tyrrhenian Sea, Italy). All broken and relict tests of benthic foraminifera and other bioclastic sediments were counted for each sample, in order to provide a more complete description...
Published in: | The Journal of Foraminiferal Research |
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Main Authors: | , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
CUSHMAN FOUNDATION FORAMINIFERAL RES
2010
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Subjects: | |
Online Access: | http://hdl.handle.net/11573/363761 https://doi.org/10.2113/gsjfr.40.4.313 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000282353700002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a http://jfr.geoscienceworld.org/content/vol40/issue4/ http://www.scopus.com/inward/record.url?eid=2-s2.0-77958469450&partnerID=65&md5=1a6b21ec34a194e0a35f59eeb0db05eb |
Summary: | Recent foraminiferal assemblages are identified in 70 grab samples from 20-380 m depth in the Pontine Archipelago (Tyrrhenian Sea, Italy). All broken and relict tests of benthic foraminifera and other bioclastic sediments were counted for each sample, in order to provide a more complete description of the benthic community. Hierarchical cluster analysis (HCA) was performed on the relative abundances (live + dead) of 53 taxa of benthic foraminifera that were common in the samples. Q-mode HCA recognizes three distinct foraminiferal biofacies, each associated with a particular bioclastic lithofacies: 1) the Asterigerinata-Lobatula-Rosalina biofacies occurs at 20-150 m and is dominated by benthic foraminifera, most notably epiphytic species such as Asterigerinata mantilla, Lobatula lobatula, and Rosalina brad vi; other bioclasts include rhodoliths, bryozoans, and echinoid spines, which constitute the rhodalgal lithofacies; 2) the Cassidulina carinata biofacies at intermediate depths of 100-250 m includes benthic and planktonic foraminifera among branches of bryozoans that constitute the bryomol lithofacies; also present are high percentages of reworked glauconitic tests of shallow-water taxa (e.g., Elphidium, Lobatula, and Asterigerinata), possibly related to Late Quaternary sea-level stillstands; 3) the Uvigerina-Bulimina biofacies at 200-380 m, that is characterized by Uvigerina mediterranea and Bulimina marginata; in addition to benthic and planktonic foraminifera, it has a molechfor lithofacies of bivalves and gastropods. |
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