Laminated sediments from the Vrica section (Calabria, S. Italy): evidence for plio-pleistocene climatic change in the Mediterranean region
Six laminated sedimentary units (laminites) from the Vrica section (Calabria, southern Italy) have been analyzed geochemically and micropaleontologically to assess paleoclimatic conditions in this region during the transition from the Pliocene to the Pleistocene. Two laminites formed during the earl...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Online Access: | http://hdl.handle.net/11577/2513673 https://doi.org/10.1016/0031-0182(90)90214-R |
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ftunivpadovairis:oai:www.research.unipd.it:11577/2513673 2024-01-21T10:09:51+01:00 Laminated sediments from the Vrica section (Calabria, S. Italy): evidence for plio-pleistocene climatic change in the Mediterranean region Howell M. W. Thunell R. C. RIO, DOMENICO Howell, M. W. Rio, Domenico Thunell, R. C. 1990 STAMPA http://hdl.handle.net/11577/2513673 https://doi.org/10.1016/0031-0182(90)90214-R eng eng Elsevier Ltd volume:78 firstpage:195 lastpage:216 numberofpages:22 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/11577/2513673 doi:10.1016/0031-0182(90)90214-R info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0025591038 info:eu-repo/semantics/article 1990 ftunivpadovairis https://doi.org/10.1016/0031-0182(90)90214-R 2023-12-27T17:48:20Z Six laminated sedimentary units (laminites) from the Vrica section (Calabria, southern Italy) have been analyzed geochemically and micropaleontologically to assess paleoclimatic conditions in this region during the transition from the Pliocene to the Pleistocene. Two laminites formed during the early Pleistocene and one formed immediately below the Pliocene/Pleistocene boundary; all have a greater organic carbon content relative to the surrounding marls. By contrast, three late Pliocene laminites exhibit no significant increase in organic carbon, which indicates that the conditions associated with the formation of these three units were somewhat different than those associated with the formation of the three younger laminites. Stable isotope analyses of planktonic foraminifera from the laminites indicate that all of these units were formed during periods of decreased salinity concentrations in surface waters. The laminites were formed as a result of basin anoxia brought on by increased surface-water stratification during periods of high runoff. The Vrica planktonic foraminiferal census data indicates that the laminites contain a distinctive fauna which can be partially attributed to increased nutrient concentrations. By contrast, species assemblages within the marls seem to be primarily controlled by surface-water temperatures. Through the use of polytopic vector analysis, the foraminiferal census data can be simplified into five assemblages, each of which reflects temperature, salinity and/or nutrient concentrations. The nutrient-dependent assemblage indicates an intensification in surface water productivity during periods of laminite formation during the later Pliocene and early Pleistocene, while the temperature-dependent assemblages indicate an overall cooling of surface-water temperatures during the same period. The results of the planktonic foraminiferal analyses support the concept of a regional cooling across the Pliocene/Pleistocene boundary in the Mediterranean. In addition, the results of this study ... Article in Journal/Newspaper Planktonic foraminifera Padua Research Archive (IRIS - Università degli Studi di Padova) Palaeogeography, Palaeoclimatology, Palaeoecology 78 3-4 195 216 |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
op_collection_id |
ftunivpadovairis |
language |
English |
description |
Six laminated sedimentary units (laminites) from the Vrica section (Calabria, southern Italy) have been analyzed geochemically and micropaleontologically to assess paleoclimatic conditions in this region during the transition from the Pliocene to the Pleistocene. Two laminites formed during the early Pleistocene and one formed immediately below the Pliocene/Pleistocene boundary; all have a greater organic carbon content relative to the surrounding marls. By contrast, three late Pliocene laminites exhibit no significant increase in organic carbon, which indicates that the conditions associated with the formation of these three units were somewhat different than those associated with the formation of the three younger laminites. Stable isotope analyses of planktonic foraminifera from the laminites indicate that all of these units were formed during periods of decreased salinity concentrations in surface waters. The laminites were formed as a result of basin anoxia brought on by increased surface-water stratification during periods of high runoff. The Vrica planktonic foraminiferal census data indicates that the laminites contain a distinctive fauna which can be partially attributed to increased nutrient concentrations. By contrast, species assemblages within the marls seem to be primarily controlled by surface-water temperatures. Through the use of polytopic vector analysis, the foraminiferal census data can be simplified into five assemblages, each of which reflects temperature, salinity and/or nutrient concentrations. The nutrient-dependent assemblage indicates an intensification in surface water productivity during periods of laminite formation during the later Pliocene and early Pleistocene, while the temperature-dependent assemblages indicate an overall cooling of surface-water temperatures during the same period. The results of the planktonic foraminiferal analyses support the concept of a regional cooling across the Pliocene/Pleistocene boundary in the Mediterranean. In addition, the results of this study ... |
author2 |
Howell, M. W. Rio, Domenico Thunell, R. C. |
format |
Article in Journal/Newspaper |
author |
Howell M. W. Thunell R. C. RIO, DOMENICO |
spellingShingle |
Howell M. W. Thunell R. C. RIO, DOMENICO Laminated sediments from the Vrica section (Calabria, S. Italy): evidence for plio-pleistocene climatic change in the Mediterranean region |
author_facet |
Howell M. W. Thunell R. C. RIO, DOMENICO |
author_sort |
Howell M. W. |
title |
Laminated sediments from the Vrica section (Calabria, S. Italy): evidence for plio-pleistocene climatic change in the Mediterranean region |
title_short |
Laminated sediments from the Vrica section (Calabria, S. Italy): evidence for plio-pleistocene climatic change in the Mediterranean region |
title_full |
Laminated sediments from the Vrica section (Calabria, S. Italy): evidence for plio-pleistocene climatic change in the Mediterranean region |
title_fullStr |
Laminated sediments from the Vrica section (Calabria, S. Italy): evidence for plio-pleistocene climatic change in the Mediterranean region |
title_full_unstemmed |
Laminated sediments from the Vrica section (Calabria, S. Italy): evidence for plio-pleistocene climatic change in the Mediterranean region |
title_sort |
laminated sediments from the vrica section (calabria, s. italy): evidence for plio-pleistocene climatic change in the mediterranean region |
publisher |
Elsevier Ltd |
publishDate |
1990 |
url |
http://hdl.handle.net/11577/2513673 https://doi.org/10.1016/0031-0182(90)90214-R |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
volume:78 firstpage:195 lastpage:216 numberofpages:22 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/11577/2513673 doi:10.1016/0031-0182(90)90214-R info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0025591038 |
op_doi |
https://doi.org/10.1016/0031-0182(90)90214-R |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
78 |
container_issue |
3-4 |
container_start_page |
195 |
op_container_end_page |
216 |
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1788700995570630656 |