Deciphering bottom current velocity and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: An inorganic geochemical approach
Contourites in the Gulf of Cádiz (GC) preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study, we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two diffe...
Gespeichert in:
| Veröffentlicht in: | Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2014-08, Vol.15 (8), p.3145-3160 |
|---|---|
| Hauptverfasser: | , , , , , , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext bestellen |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 3160 |
|---|---|
| container_issue | 8 |
| container_start_page | 3145 |
| container_title | Geochemistry, geophysics, geosystems : G3 |
| container_volume | 15 |
| creator | Bahr, André Jiménez-Espejo, Francisco J. Kolasinac, Nada Grunert, Patrick Hernández-Molina, F. Javier Röhl, Ursula Voelker, Antje H. L. Escutia, Carlota Stow, Dorrik A. V. Hodell, David Alvarez-Zarikian, Carlos A. |
| description | Contourites in the Gulf of Cádiz (GC) preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study, we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled during IODP Expedition 339 through contourites in the northern GC: Site U1387, which is bathed by the upper MOW core, and Site U1389, located more proximal to the Strait of Gibraltar. The lack of major downslope transport during the Pleistocene makes both locations ideally suited for our study. The results indicate that the Zr/Al ratio, representing the relative enrichment of heavy minerals (zircon) over less dense alumnosilicates under fast bottom current flow, is the most useful indicator for a semiquantitative assessment of current velocity. Although most elements are biased by current‐related processes, the bromine (Br) record, representing organic content, preserves the most pristine climate signal rather independent of grain‐size changes. Hence, Br can be used for chronostratigraphy and site‐to‐site correlation in addition to stable isotope stratigraphy. Based on these findings, we reconstructed MOW variability for Marine Isotope Stages (MIS) 1–5 using the Zr/Al ratio from Site U1387. The results reveal abrupt, millennial‐scale variations of MOW strength during Greenland Stadials (GS) and Interstadials (GI) with strong MOW during GS and glacial Terminations and a complex behavior during Heinrich Stadials. Millennial‐scale variability persisting during periods of poorly expressed GS/GI cyclicities implies a strong internal oscillation of the Mediterranean/North Atlantic climate system.
Key Points
XRF Zr/Al ratio reflects bottom current velocity
Bromine can be used for stratigraphic correlation
MOW strength varies synchronously to high latitude climate change |
| doi_str_mv | 10.1002/2014GC005356 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_24P</sourceid><recordid>TN_cdi_proquest_miscellaneous_1654677822</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>3557377861</sourcerecordid><originalsourceid>FETCH-LOGICAL-a4253-8f1a1cb5b6a082965448c672bd57bd2c74c7374a6d3eae235a943ef9da1eb97a3</originalsourceid><addsrcrecordid>eNpdkc9u1DAQxiMEEqVw4wEsceES8J84znIroU2RClxAK3GxJs5k1603DrYDXd6GCy_Ci-FlEao4jTX-ffNpvimKp4y-YJTyl5yyqmsplULW94oTJrksOeXq_p33w-JRjNc0k1I2J8XPN2jsvMVgpw3pfUp-R8wSAk6JfEXnjU17AtNAZnDojbM7SEii3UzgIhnDAfdT8kuwuT_g7KNNkdiJpC2SbnEj8SNpf_0Y7HcyLH9sDj8OYiKsouRmH16RsykrfNjAZA3ZZJ8t7qwBR2CegwezfVw8GLMhPvlbT4tPF-cf28vy6kP3tj27KqHiUpTNyICZXvY10IavallVjakV7wep-oEbVRklVAX1IBCQCwmrSuC4GoBhv1IgTovnx7nZ9suCMemdjQadgwn9EjXLI2ulGs4z-uw_9DqncIglU5UUrFFNkylxpL5Zh3s9hxxg2GtG9eFi-u7FdNd155xKLrKqPKpsTHj7TwXhRtd5AanX7zvdrNfvLtvPr_Va_Aa_VJyg</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1645318788</pqid></control><display><type>article</type><title>Deciphering bottom current velocity and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: An inorganic geochemical approach</title><source>Wiley Online Library Open Access</source><creator>Bahr, André ; Jiménez-Espejo, Francisco J. ; Kolasinac, Nada ; Grunert, Patrick ; Hernández-Molina, F. Javier ; Röhl, Ursula ; Voelker, Antje H. L. ; Escutia, Carlota ; Stow, Dorrik A. V. ; Hodell, David ; Alvarez-Zarikian, Carlos A.</creator><creatorcontrib>Bahr, André ; Jiménez-Espejo, Francisco J. ; Kolasinac, Nada ; Grunert, Patrick ; Hernández-Molina, F. Javier ; Röhl, Ursula ; Voelker, Antje H. L. ; Escutia, Carlota ; Stow, Dorrik A. V. ; Hodell, David ; Alvarez-Zarikian, Carlos A.</creatorcontrib><description>Contourites in the Gulf of Cádiz (GC) preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study, we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled during IODP Expedition 339 through contourites in the northern GC: Site U1387, which is bathed by the upper MOW core, and Site U1389, located more proximal to the Strait of Gibraltar. The lack of major downslope transport during the Pleistocene makes both locations ideally suited for our study. The results indicate that the Zr/Al ratio, representing the relative enrichment of heavy minerals (zircon) over less dense alumnosilicates under fast bottom current flow, is the most useful indicator for a semiquantitative assessment of current velocity. Although most elements are biased by current‐related processes, the bromine (Br) record, representing organic content, preserves the most pristine climate signal rather independent of grain‐size changes. Hence, Br can be used for chronostratigraphy and site‐to‐site correlation in addition to stable isotope stratigraphy. Based on these findings, we reconstructed MOW variability for Marine Isotope Stages (MIS) 1–5 using the Zr/Al ratio from Site U1387. The results reveal abrupt, millennial‐scale variations of MOW strength during Greenland Stadials (GS) and Interstadials (GI) with strong MOW during GS and glacial Terminations and a complex behavior during Heinrich Stadials. Millennial‐scale variability persisting during periods of poorly expressed GS/GI cyclicities implies a strong internal oscillation of the Mediterranean/North Atlantic climate system.
Key Points
XRF Zr/Al ratio reflects bottom current velocity
Bromine can be used for stratigraphic correlation
MOW strength varies synchronously to high latitude climate change</description><identifier>ISSN: 1525-2027</identifier><identifier>EISSN: 1525-2027</identifier><identifier>DOI: 10.1002/2014GC005356</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>bottom current velocity ; Bottom currents ; Bromine ; Climate change ; Climate system ; contourites ; Geochemistry ; Geophysics ; Gulf of Cadiz ; Ocean bottom ; Oceanography ; Paleoclimate ; Pleistocene ; Stable isotopes ; Stratigraphy ; XRF core scanning ; Zr/Al</subject><ispartof>Geochemistry, geophysics, geosystems : G3, 2014-08, Vol.15 (8), p.3145-3160</ispartof><rights>2014. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2014GC005356$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2014GC005356$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,11541,27901,27902,45550,45551,46027,46451</link.rule.ids><linktorsrc>$$Uhttps://onlinelibrary.wiley.com/doi/abs/10.1002%2F2014GC005356$$EView_record_in_Wiley-Blackwell$$FView_record_in_$$GWiley-Blackwell</linktorsrc></links><search><creatorcontrib>Bahr, André</creatorcontrib><creatorcontrib>Jiménez-Espejo, Francisco J.</creatorcontrib><creatorcontrib>Kolasinac, Nada</creatorcontrib><creatorcontrib>Grunert, Patrick</creatorcontrib><creatorcontrib>Hernández-Molina, F. Javier</creatorcontrib><creatorcontrib>Röhl, Ursula</creatorcontrib><creatorcontrib>Voelker, Antje H. L.</creatorcontrib><creatorcontrib>Escutia, Carlota</creatorcontrib><creatorcontrib>Stow, Dorrik A. V.</creatorcontrib><creatorcontrib>Hodell, David</creatorcontrib><creatorcontrib>Alvarez-Zarikian, Carlos A.</creatorcontrib><title>Deciphering bottom current velocity and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: An inorganic geochemical approach</title><title>Geochemistry, geophysics, geosystems : G3</title><addtitle>Geochem. Geophys. Geosyst</addtitle><description>Contourites in the Gulf of Cádiz (GC) preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study, we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled during IODP Expedition 339 through contourites in the northern GC: Site U1387, which is bathed by the upper MOW core, and Site U1389, located more proximal to the Strait of Gibraltar. The lack of major downslope transport during the Pleistocene makes both locations ideally suited for our study. The results indicate that the Zr/Al ratio, representing the relative enrichment of heavy minerals (zircon) over less dense alumnosilicates under fast bottom current flow, is the most useful indicator for a semiquantitative assessment of current velocity. Although most elements are biased by current‐related processes, the bromine (Br) record, representing organic content, preserves the most pristine climate signal rather independent of grain‐size changes. Hence, Br can be used for chronostratigraphy and site‐to‐site correlation in addition to stable isotope stratigraphy. Based on these findings, we reconstructed MOW variability for Marine Isotope Stages (MIS) 1–5 using the Zr/Al ratio from Site U1387. The results reveal abrupt, millennial‐scale variations of MOW strength during Greenland Stadials (GS) and Interstadials (GI) with strong MOW during GS and glacial Terminations and a complex behavior during Heinrich Stadials. Millennial‐scale variability persisting during periods of poorly expressed GS/GI cyclicities implies a strong internal oscillation of the Mediterranean/North Atlantic climate system.
Key Points
XRF Zr/Al ratio reflects bottom current velocity
Bromine can be used for stratigraphic correlation
MOW strength varies synchronously to high latitude climate change</description><subject>bottom current velocity</subject><subject>Bottom currents</subject><subject>Bromine</subject><subject>Climate change</subject><subject>Climate system</subject><subject>contourites</subject><subject>Geochemistry</subject><subject>Geophysics</subject><subject>Gulf of Cadiz</subject><subject>Ocean bottom</subject><subject>Oceanography</subject><subject>Paleoclimate</subject><subject>Pleistocene</subject><subject>Stable isotopes</subject><subject>Stratigraphy</subject><subject>XRF core scanning</subject><subject>Zr/Al</subject><issn>1525-2027</issn><issn>1525-2027</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNpdkc9u1DAQxiMEEqVw4wEsceES8J84znIroU2RClxAK3GxJs5k1603DrYDXd6GCy_Ci-FlEao4jTX-ffNpvimKp4y-YJTyl5yyqmsplULW94oTJrksOeXq_p33w-JRjNc0k1I2J8XPN2jsvMVgpw3pfUp-R8wSAk6JfEXnjU17AtNAZnDojbM7SEii3UzgIhnDAfdT8kuwuT_g7KNNkdiJpC2SbnEj8SNpf_0Y7HcyLH9sDj8OYiKsouRmH16RsykrfNjAZA3ZZJ8t7qwBR2CegwezfVw8GLMhPvlbT4tPF-cf28vy6kP3tj27KqHiUpTNyICZXvY10IavallVjakV7wep-oEbVRklVAX1IBCQCwmrSuC4GoBhv1IgTovnx7nZ9suCMemdjQadgwn9EjXLI2ulGs4z-uw_9DqncIglU5UUrFFNkylxpL5Zh3s9hxxg2GtG9eFi-u7FdNd155xKLrKqPKpsTHj7TwXhRtd5AanX7zvdrNfvLtvPr_Va_Aa_VJyg</recordid><startdate>201408</startdate><enddate>201408</enddate><creator>Bahr, André</creator><creator>Jiménez-Espejo, Francisco J.</creator><creator>Kolasinac, Nada</creator><creator>Grunert, Patrick</creator><creator>Hernández-Molina, F. Javier</creator><creator>Röhl, Ursula</creator><creator>Voelker, Antje H. L.</creator><creator>Escutia, Carlota</creator><creator>Stow, Dorrik A. V.</creator><creator>Hodell, David</creator><creator>Alvarez-Zarikian, Carlos A.</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope></search><sort><creationdate>201408</creationdate><title>Deciphering bottom current velocity and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: An inorganic geochemical approach</title><author>Bahr, André ; Jiménez-Espejo, Francisco J. ; Kolasinac, Nada ; Grunert, Patrick ; Hernández-Molina, F. Javier ; Röhl, Ursula ; Voelker, Antje H. L. ; Escutia, Carlota ; Stow, Dorrik A. V. ; Hodell, David ; Alvarez-Zarikian, Carlos A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4253-8f1a1cb5b6a082965448c672bd57bd2c74c7374a6d3eae235a943ef9da1eb97a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>bottom current velocity</topic><topic>Bottom currents</topic><topic>Bromine</topic><topic>Climate change</topic><topic>Climate system</topic><topic>contourites</topic><topic>Geochemistry</topic><topic>Geophysics</topic><topic>Gulf of Cadiz</topic><topic>Ocean bottom</topic><topic>Oceanography</topic><topic>Paleoclimate</topic><topic>Pleistocene</topic><topic>Stable isotopes</topic><topic>Stratigraphy</topic><topic>XRF core scanning</topic><topic>Zr/Al</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bahr, André</creatorcontrib><creatorcontrib>Jiménez-Espejo, Francisco J.</creatorcontrib><creatorcontrib>Kolasinac, Nada</creatorcontrib><creatorcontrib>Grunert, Patrick</creatorcontrib><creatorcontrib>Hernández-Molina, F. Javier</creatorcontrib><creatorcontrib>Röhl, Ursula</creatorcontrib><creatorcontrib>Voelker, Antje H. L.</creatorcontrib><creatorcontrib>Escutia, Carlota</creatorcontrib><creatorcontrib>Stow, Dorrik A. V.</creatorcontrib><creatorcontrib>Hodell, David</creatorcontrib><creatorcontrib>Alvarez-Zarikian, Carlos A.</creatorcontrib><collection>Istex</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Bahr, André</au><au>Jiménez-Espejo, Francisco J.</au><au>Kolasinac, Nada</au><au>Grunert, Patrick</au><au>Hernández-Molina, F. Javier</au><au>Röhl, Ursula</au><au>Voelker, Antje H. L.</au><au>Escutia, Carlota</au><au>Stow, Dorrik A. V.</au><au>Hodell, David</au><au>Alvarez-Zarikian, Carlos A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Deciphering bottom current velocity and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: An inorganic geochemical approach</atitle><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle><addtitle>Geochem. Geophys. Geosyst</addtitle><date>2014-08</date><risdate>2014</risdate><volume>15</volume><issue>8</issue><spage>3145</spage><epage>3160</epage><pages>3145-3160</pages><issn>1525-2027</issn><eissn>1525-2027</eissn><abstract>Contourites in the Gulf of Cádiz (GC) preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study, we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled during IODP Expedition 339 through contourites in the northern GC: Site U1387, which is bathed by the upper MOW core, and Site U1389, located more proximal to the Strait of Gibraltar. The lack of major downslope transport during the Pleistocene makes both locations ideally suited for our study. The results indicate that the Zr/Al ratio, representing the relative enrichment of heavy minerals (zircon) over less dense alumnosilicates under fast bottom current flow, is the most useful indicator for a semiquantitative assessment of current velocity. Although most elements are biased by current‐related processes, the bromine (Br) record, representing organic content, preserves the most pristine climate signal rather independent of grain‐size changes. Hence, Br can be used for chronostratigraphy and site‐to‐site correlation in addition to stable isotope stratigraphy. Based on these findings, we reconstructed MOW variability for Marine Isotope Stages (MIS) 1–5 using the Zr/Al ratio from Site U1387. The results reveal abrupt, millennial‐scale variations of MOW strength during Greenland Stadials (GS) and Interstadials (GI) with strong MOW during GS and glacial Terminations and a complex behavior during Heinrich Stadials. Millennial‐scale variability persisting during periods of poorly expressed GS/GI cyclicities implies a strong internal oscillation of the Mediterranean/North Atlantic climate system.
Key Points
XRF Zr/Al ratio reflects bottom current velocity
Bromine can be used for stratigraphic correlation
MOW strength varies synchronously to high latitude climate change</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2014GC005356</doi><tpages>16</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext_linktorsrc |
| identifier | ISSN: 1525-2027 |
| ispartof | Geochemistry, geophysics, geosystems : G3, 2014-08, Vol.15 (8), p.3145-3160 |
| issn | 1525-2027 1525-2027 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1654677822 |
| source | Wiley Online Library Open Access |
| subjects | bottom current velocity Bottom currents Bromine Climate change Climate system contourites Geochemistry Geophysics Gulf of Cadiz Ocean bottom Oceanography Paleoclimate Pleistocene Stable isotopes Stratigraphy XRF core scanning Zr/Al |
| title | Deciphering bottom current velocity and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: An inorganic geochemical approach |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-05T14%3A45%3A06IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_24P&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Deciphering%20bottom%20current%20velocity%20and%20paleoclimate%20signals%20from%20contourite%20deposits%20in%20the%20Gulf%20of%20C%C3%A1diz%20during%20the%20last%20140%20kyr:%20An%20inorganic%20geochemical%20approach&rft.jtitle=Geochemistry,%20geophysics,%20geosystems%20:%20G3&rft.au=Bahr,%20Andr%C3%A9&rft.date=2014-08&rft.volume=15&rft.issue=8&rft.spage=3145&rft.epage=3160&rft.pages=3145-3160&rft.issn=1525-2027&rft.eissn=1525-2027&rft_id=info:doi/10.1002/2014GC005356&rft_dat=%3Cproquest_24P%3E3557377861%3C/proquest_24P%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1645318788&rft_id=info:pmid/&rfr_iscdi=true |