Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments
In the late Miocene the Mediterranean Sea experienced a salinity crisis and thick sequences of evaporites precipitated across the deep and marginal basins. In this study we report Os isotopic records from Deep Sea Drilling Project and Ocean Drilling Project cores in the Mediterranean: the Balearic S...
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Online Access: | http://hdl.handle.net/2318/1622454 https://doi.org/10.1002/2015PA002853 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-9186 |
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ftunivtorino:oai:iris.unito.it:2318/1622454 2023-10-29T02:38:15+01:00 Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments Kuroda Junichiro Jiménez Espejo Francisco J. Nozaki Tatsuo Lugli Stefano Manzi Vinicio Roveri Marco Flecker Rachel Sierro Francisco J. Yoshimura Toshihiro Suzuki Katsuhiko Ohkouchi Naohiko GENNARI, Rocco Kuroda Junichiro Jiménez-Espejo Francisco J. Nozaki Tatsuo Gennari Rocco Lugli Stefano Manzi Vinicio Roveri Marco Flecker Rachel Sierro Francisco J. Yoshimura Toshihiro Suzuki Katsuhiko Ohkouchi Naohiko 2016 http://hdl.handle.net/2318/1622454 https://doi.org/10.1002/2015PA002853 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-9186 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000370351800009 volume:31 issue:1 firstpage:148 lastpage:166 numberofpages:19 journal:PALEOCEANOGRAPHY http://hdl.handle.net/2318/1622454 doi:10.1002/2015PA002853 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84958752576 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-9186 evaporite Mediterranean Sea Messinian salinity crisi osmium isotope Oceanography Paleontology info:eu-repo/semantics/article 2016 ftunivtorino https://doi.org/10.1002/2015PA002853 2023-10-03T22:23:33Z In the late Miocene the Mediterranean Sea experienced a salinity crisis and thick sequences of evaporites precipitated across the deep and marginal basins. In this study we report Os isotopic records from Deep Sea Drilling Project and Ocean Drilling Project cores in the Mediterranean: the Balearic Sea (Site 372), the Tyrrhenian Sea (Site 654), the Ionian Basin (Site 374), and the Florence Rise (Sites 375-376), as well as Integrated Ocean Drilling Project Site U1387 in Gulf of Cadiz, North Atlantic. Pliocene-Pleistocene sediments at all sites show 187Os/188Os values close to that of the coeval ocean water, indicating that the Mediterranean was connected to the North Atlantic. Evaporitic sediments deposited during the latest Miocene, however, have 187Os/188Os values significantly lower than coeval ocean water values. The offset of the Mediterranean evaporite 187Os/188Os is attributed to limited exchange with the North Atlantic during the Messinian salinity crisis. The source of unradiogenic Os is likely to be weathering of ultramafic rocks (ophiolites) cropping out in the Mediterranean's drainage basins. Based on a box model we estimated the amount of unradiogenic Os and the Atlantic-Mediterranean exchange rate to explain this offset. Os isotopic ratios of the pre-evaporite sediments in the western Mediterranean are almost identical to that of the coeval ocean water. In contrast, equivalent sediments from the Florence Rise have significantly lower 187Os/188Os values. The offset in the Os isotopic ratio on the Florence Rise is attributed either to limited water exchange between eastern and western Mediterranean or to local effects associated with exhumation of the Troodos ophiolites (Cyprus). Article in Journal/Newspaper North Atlantic Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto) Paleoceanography 31 1 148 166 |
institution |
Open Polar |
collection |
Università degli studi di Torino: AperTo (Archivio Istituzionale ad Accesso Aperto) |
op_collection_id |
ftunivtorino |
language |
English |
topic |
evaporite Mediterranean Sea Messinian salinity crisi osmium isotope Oceanography Paleontology |
spellingShingle |
evaporite Mediterranean Sea Messinian salinity crisi osmium isotope Oceanography Paleontology Kuroda Junichiro Jiménez Espejo Francisco J. Nozaki Tatsuo Lugli Stefano Manzi Vinicio Roveri Marco Flecker Rachel Sierro Francisco J. Yoshimura Toshihiro Suzuki Katsuhiko Ohkouchi Naohiko GENNARI, Rocco Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments |
topic_facet |
evaporite Mediterranean Sea Messinian salinity crisi osmium isotope Oceanography Paleontology |
description |
In the late Miocene the Mediterranean Sea experienced a salinity crisis and thick sequences of evaporites precipitated across the deep and marginal basins. In this study we report Os isotopic records from Deep Sea Drilling Project and Ocean Drilling Project cores in the Mediterranean: the Balearic Sea (Site 372), the Tyrrhenian Sea (Site 654), the Ionian Basin (Site 374), and the Florence Rise (Sites 375-376), as well as Integrated Ocean Drilling Project Site U1387 in Gulf of Cadiz, North Atlantic. Pliocene-Pleistocene sediments at all sites show 187Os/188Os values close to that of the coeval ocean water, indicating that the Mediterranean was connected to the North Atlantic. Evaporitic sediments deposited during the latest Miocene, however, have 187Os/188Os values significantly lower than coeval ocean water values. The offset of the Mediterranean evaporite 187Os/188Os is attributed to limited exchange with the North Atlantic during the Messinian salinity crisis. The source of unradiogenic Os is likely to be weathering of ultramafic rocks (ophiolites) cropping out in the Mediterranean's drainage basins. Based on a box model we estimated the amount of unradiogenic Os and the Atlantic-Mediterranean exchange rate to explain this offset. Os isotopic ratios of the pre-evaporite sediments in the western Mediterranean are almost identical to that of the coeval ocean water. In contrast, equivalent sediments from the Florence Rise have significantly lower 187Os/188Os values. The offset in the Os isotopic ratio on the Florence Rise is attributed either to limited water exchange between eastern and western Mediterranean or to local effects associated with exhumation of the Troodos ophiolites (Cyprus). |
author2 |
Kuroda Junichiro Jiménez-Espejo Francisco J. Nozaki Tatsuo Gennari Rocco Lugli Stefano Manzi Vinicio Roveri Marco Flecker Rachel Sierro Francisco J. Yoshimura Toshihiro Suzuki Katsuhiko Ohkouchi Naohiko |
format |
Article in Journal/Newspaper |
author |
Kuroda Junichiro Jiménez Espejo Francisco J. Nozaki Tatsuo Lugli Stefano Manzi Vinicio Roveri Marco Flecker Rachel Sierro Francisco J. Yoshimura Toshihiro Suzuki Katsuhiko Ohkouchi Naohiko GENNARI, Rocco |
author_facet |
Kuroda Junichiro Jiménez Espejo Francisco J. Nozaki Tatsuo Lugli Stefano Manzi Vinicio Roveri Marco Flecker Rachel Sierro Francisco J. Yoshimura Toshihiro Suzuki Katsuhiko Ohkouchi Naohiko GENNARI, Rocco |
author_sort |
Kuroda Junichiro |
title |
Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments |
title_short |
Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments |
title_full |
Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments |
title_fullStr |
Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments |
title_full_unstemmed |
Miocene to Pleistocene osmium isotopic records of the Mediterranean sediments |
title_sort |
miocene to pleistocene osmium isotopic records of the mediterranean sediments |
publishDate |
2016 |
url |
http://hdl.handle.net/2318/1622454 https://doi.org/10.1002/2015PA002853 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-9186 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000370351800009 volume:31 issue:1 firstpage:148 lastpage:166 numberofpages:19 journal:PALEOCEANOGRAPHY http://hdl.handle.net/2318/1622454 doi:10.1002/2015PA002853 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84958752576 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1944-9186 |
op_doi |
https://doi.org/10.1002/2015PA002853 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
1 |
container_start_page |
148 |
op_container_end_page |
166 |
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1781064099239559168 |