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Sea-level and monsoonal control on the Maldives carbonate platform (Indian Ocean) over the last 1.3 million years

2024Journal article Open Access
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dc.contributor.authorAlonso-Garcia, Montserrat
dc.contributor.authorReolid, Jesus
dc.contributor.authorJimenez-Espejo, Francisco J.
dc.contributor.authorBialik, Or M.
dc.contributor.authorAlvarez Zarikian, Carlos A.
dc.contributor.authorLaya, Juan Carlos
dc.contributor.authorCarrasquiera, Igor
dc.contributor.authorJovane, Luigi
dc.contributor.authorReijmer, John J. G.
dc.contributor.authorEberli, Gregor P.
dc.contributor.authorBetzler, Christian
dc.date.accessioned2024-04-15T09:02:37Z
dc.date.available2024-04-15T09:02:37Z
dc.date.issued2024
dc.description.abstractThe Maldives Archipelago (Indian Ocean), composed of two rows of atolls that enclose an inner sea, offers an excellent study site to explore the forcings of carbonate production at platforms. Glacial-interglacial sea-level changes have been claimed to be the main factor controlling the carbonate platform factories; however, climatic factors may also have an impact. In this work we used geochemical compositional records, obtained by X-ray fluorescence (XRF) core-scanning from the International Ocean Discovery Program (IODP) Site U1467 in the Maldives Inner Sea, to analyze the orbitally driven fluctuations on the carbonate production and export from the neritic environment into the Maldives Inner Sea over the last 1.3 million years.High Sr aragonite-rich carbonates (HSAC) from neritic settings were deposited in the Maldives Inner Sea during sea-level highstand intervals, increasing the Sr / Ca values. In contrast, low Sr / Ca values are observed coincident with sea-level lowstand periods, suggesting that large areas of the atolls were exposed or unable to grow, and therefore, there was a demise in the carbonate production and sediment export to the Maldives Inner Sea. However, comparison of the Sr / Ca values and the sea-level reconstructions for different interglacial periods before and after the mid-Brunhes event (MBE, similar to 430 ka ) indicates that sea level is not the only factor controlling the production of HSAC during sea-level highstands. The study of monsoon and primary productivity proxies ( Fe -normalized, Fe / K , and Br -normalized records) from the same site suggests that the intensity of the summer monsoon and the Indian Ocean dipole probably modulated the carbonate production at the atolls. Moreover, Marine Isotope Stage 11 stands out as a period with high sea level and extraordinary carbonate production in the Maldives platform. This outstanding carbonate production in the Maldives atolls (and in other low-latitude carbonate platforms) probably contributed to the mid-Brunhes dissolution event through a strong shelf-to-basin fractionation of carbonate deposition.pt_PT
dc.description.sponsorshipPID2021-128322NB-I00; 2016/24946-9; OCE14-50528, OCE-1326927pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.5194/cp-20-547-2024pt_PT
dc.identifier.issn1814-9324
dc.identifier.urihttp://hdl.handle.net/10400.1/20630
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherEuropean Geosciences Unionpt_PT
dc.relationIndian monsoon and vegetation dynamics: lessons from two contrasting glacial-interglacial cycles of the Middle Pleistocene
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectLong-term changespt_PT
dc.subjectOxygen-isotope recordpt_PT
dc.subjectNorth-atlanticpt_PT
dc.subjectIce volumept_PT
dc.subjectSurface temperaturept_PT
dc.subjectClimate variabilitypt_PT
dc.subjectAntarctic climatept_PT
dc.subjectQuaternary oceanpt_PT
dc.subjectSouth atlanticpt_PT
dc.subjectGlobal monsoonpt_PT
dc.titleSea-level and monsoonal control on the Maldives carbonate platform (Indian Ocean) over the last 1.3 million yearspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleIndian monsoon and vegetation dynamics: lessons from two contrasting glacial-interglacial cycles of the Middle Pleistocene
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/EXPL%2FCTA-CLI%2F0612%2F2021/PT
oaire.citation.endPage571pt_PT
oaire.citation.issue3pt_PT
oaire.citation.startPage547pt_PT
oaire.citation.titleClimate of the Pastpt_PT
oaire.citation.volume20pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameAlonso-Garcia
person.givenNameMontserrat
person.identifier.ciencia-id5B1B-33EE-50B9
person.identifier.orcid0000-0002-0241-2178
person.identifier.scopus-author-id51565655800
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isAuthorOfPublication.latestForDiscovery7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isProjectOfPublication7f244a5f-1aa8-426f-a852-17259a8937eb
relation.isProjectOfPublication.latestForDiscovery7f244a5f-1aa8-426f-a852-17259a8937eb

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