Repository logo
 
Publication

Paleoproductivity proxies and alkenone precursors in the Western Mediterranean during the Early-Middle Pleistocene transition

2022-09Journal article Restricted access
Simple item page
dc.contributor.authorMarino, Maria
dc.contributor.authorRodrigues, Teresa
dc.contributor.authorQuivelli, Ornella
dc.contributor.authorGirone, Angela
dc.contributor.authorMaiorano, Patrizia
dc.contributor.authorBassinot, Franck
dc.date.accessioned2022-12-09T13:25:12Z
dc.date.available2022-12-09T13:25:12Z
dc.date.issued2022-09
dc.description.abstractMultidisciplinary analyses (taxonomic analysis of coccolithophore assemblages, stable oxygen isotopes, marine and terrestrial biomarkers) have been carried out on sediments from Ocean Drilling Program Site 975 in the Algero-Balearic basin, through late marine isotope stage (MIS) 20-19 (800-756 ka). The aim is to compare coccolithophore paleoproductivity proxies, such as C-37 alkenone concentration and nannofossil accumulation rate (NAR), and understand their relationship with paleoceanographic condition and paleoenvironmental changes, alkenone-producing precursors and unsaturated C-37 alkenone compounds. The patterns of C-37 alkenones and NAR provide reliable information on past paleoproductivity changes since coccolith dissolution and organic matter preservation were excluded as relevant processes at the site. This is testified by the high values of Nannofossil Dissolution Index and relation between C-37 alkenone concentration and Alcohol Preservation Index, the latter used as a proxy of sea bottom ventilation in the basin. A weak mismatching between NAR and C-37 alkenone concentration records has been observed and related to paleoenvironmental factors and ecological preferences of alkenone-producing species. Temperature variations mostly controlled the alternating interspecific abundance variations of these taxa through glacial-interglacial and stadial-interstadial climate phases. The percentage abundances of alkenone-producing species, Gephyrocapsa caribbeanica and Gephyrocapsa with open central area (mainly G. margerelii-G. muellerae) strongly co-varied with the percentages of C-37:2 and C-37:3, respectively during warm and cool-cold periods, suggesting their prominent role in producing these unsaturated C-37 alkenone compounds. Moreover, Gephyrocapsa spp. with open central area > 3 mu m were likely the main C-37:4 producers during the colder late MIS 20 stadial and stadial phases. Other factors in addition to temperature influenced the paleoproductivity proxy patterns. The oceanographic condition established during MIS 20-MIS 19 deglaciation and the more nutrient-rich surface waters during the orbitally-controlled organic-rich layer deposition in the early MIS 19 enhanced primary productivity leading to higher production and preservation of total C-37 alkenones.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.palaeo.2022.111104pt_PT
dc.identifier.eissn1872-616X
dc.identifier.urihttp://hdl.handle.net/10400.1/18611
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relationFeatures and lessons from Past Interglacials ? warm periods ? over the last 1.5 Ma
dc.subjectCoccolithophorespt_PT
dc.subjectMarine and terrestrial biomarkerspt_PT
dc.subjectDelta O-18(G .bulloides)pt_PT
dc.subjectAlkenone-SSTpt_PT
dc.subjectAlgero-Balearic basinpt_PT
dc.subjectMIS 20-MIS 19pt_PT
dc.titlePaleoproductivity proxies and alkenone precursors in the Western Mediterranean during the Early-Middle Pleistocene transitionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardTitleFeatures and lessons from Past Interglacials ? warm periods ? over the last 1.5 Ma
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FCTA-GEO%2F29897%2F2017/PT
oaire.citation.startPage111104pt_PT
oaire.citation.titlePalaeogeography, Palaeoclimatology, Palaeoecologypt_PT
oaire.citation.volume601pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream9471 - RIDTI
person.familyNameRodrigues
person.givenNameTeresa
person.identifier.ciencia-idEC18-2390-9594
person.identifier.orcid0000-0001-7811-7506
person.identifier.ridG-2912-2013
person.identifier.scopus-author-id7004330274
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0a137e49-be7a-4e12-85e2-3def90980f7e
relation.isAuthorOfPublication.latestForDiscovery0a137e49-be7a-4e12-85e2-3def90980f7e
relation.isProjectOfPublicationfafa76a6-2cd2-4a6d-a3c9-772f34d3b91f
relation.isProjectOfPublication15f91d45-e070-47d8-b6b8-efd4de31d9a8
relation.isProjectOfPublication794d4c77-c731-471e-bc96-5a41dcd3d872
relation.isProjectOfPublication56bbcfa3-d0ad-4fbd-817a-b9fed5e36b76
relation.isProjectOfPublication.latestForDiscovery794d4c77-c731-471e-bc96-5a41dcd3d872

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Paleoproductivity proxies and alkenone precursors in the Western Mediterranean during the Early-Middle Pleistocene transition.pdf
Size:
2.62 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
3.46 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

CCM2-Artigos (em revistas ou actas indexadas)