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Cyclic anoxia and organic rich carbonate sediments within a drowned carbonate platform linked to Antarctic ice volume changes: Late Oligocene-early Miocene Maldives

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dc.contributor.authorSwart, Peter K.
dc.contributor.authorBlattler, Clara L.
dc.contributor.authorNakakuni, Masatoshi
dc.contributor.authorMackenzie, Greta J.
dc.contributor.authorBetzler, Christian
dc.contributor.authorEberli, Gregor P.
dc.contributor.authorReolid, Jesus
dc.contributor.authorAlonso-Garcia, Montserrat
dc.contributor.authorSlagle, Angela L.
dc.contributor.authorWright, James D.
dc.contributor.authorKroon, Dick
dc.contributor.authorReijmer, John J. G.
dc.contributor.authorMee, Anna L. Hui
dc.contributor.authorYoung, Jeremy R.
dc.contributor.authorAlvarez-Zarikian, Carlos A.
dc.contributor.authorBialik, Orr M.
dc.contributor.authorGuo, Junhua Adam
dc.contributor.authorHaffen, Sebastian
dc.contributor.authorHorozal, Senay
dc.contributor.authorInoue, Mayuri
dc.contributor.authorJovane, Luigi
dc.contributor.authorLanci, Luca
dc.contributor.authorLaya, Juan Carlos
dc.contributor.authorLuedmann, Thomas
dc.contributor.authorNath, B. Nagender
dc.contributor.authorNiino, Kaoru
dc.contributor.authorPetruny, Loren M.
dc.contributor.authorPratiwi, Santi Dwi
dc.contributor.authorSu, Xiang
dc.contributor.authorSloss, Craig R.
dc.contributor.authorYao, Zhengquan
dc.date.accessioned2020-07-24T10:51:44Z
dc.date.available2020-07-24T10:51:44Z
dc.date.issued2019-09
dc.description.abstractThis paper reports on the newly discovered occurrence of thick sequences (similar to 100 m) of Late Oligocene and Early Miocene (similar to 24.9 to similar to 20 Ma) interbedded organic-rich sediments (sapropels) and pelagic (organic poor) carbonates at Sites 01466 and U1468 drilled in the Maldives archipelago during the International Ocean Discovery Program (IODP) Expedition 359. This occurrence is unusual in that this sequence is located > 1000 m above the surrounding ocean floor within an inter-atoll basin and not linked to any known global oceanic events. Total organic content reaches as high as 35% in the darker layers, while the interbedded carbonates have concentrations of less than 0.1%. Trace elements characteristic of anoxic waters, such as Mo, V, Cr, U, and Pb, correlate positively with concentrations of organic carbon. Nitrogen isotopic data show no evidence that the intervals of high total organic carbon are related to enhanced productivity driven by upwelling. Instead, high organic carbon is associated with intervals of anoxia. We propose that sea-level fluctuations linked to changes in Antarctic ice volume restricted exchange with the open ocean causing bottom waters of the inter-atoll basin to become anoxic periodically. The architecture of the platform at the end of the Oligocene, combined with the global sea-level highstand, set the stage for orbitally-driven sea-level changes producing cyclic deposition of sapropels. The proposed mechanism may serve as an analogue for other occurrences of organic carbon rich sediments within carbonate platform settings. (C) 2019 Elsevier B.V. All rights reserved.
dc.description.sponsorshipPortuguese National Science and Technology Foundation [SFRH/BPD/96960/2013, UID/Multi/04326/2013]
dc.description.sponsorshipNatural History Museum, London
dc.description.sponsorshipUKIODP [NE/N014049/1]
dc.description.sponsorshipNERCNERC Natural Environment Research Council [3148]
dc.description.sponsorshipIODP U.S. Science Support Program [NSF OCE1450528]
dc.description.sponsorshipComparative Sedimentology Laboratory
dc.description.sponsorshipJAMSTEC IODP After Cruise Research Program (Exp. 359)
dc.identifier.doi10.1016/j.epsl.2019.05.019
dc.identifier.issn0012-821X
dc.identifier.issn1385-013X
dc.identifier.urihttp://hdl.handle.net/10400.1/14265
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectSaanich inlet
dc.subjectTrace-metals
dc.subjectEvents
dc.subjectShales
dc.subjectGeochemistry
dc.subjectResolution
dc.subjectParticles
dc.subjectEvolution
dc.subjectBehavior
dc.subjectSinking
dc.titleCyclic anoxia and organic rich carbonate sediments within a drowned carbonate platform linked to Antarctic ice volume changes: Late Oligocene-early Miocene Maldives
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.endPage13
oaire.citation.startPage1
oaire.citation.titleEarth and Planetary Science Letters
oaire.citation.volume521
oaire.fundingStream5876
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.contributor.authoremailmontsealonso82@gmail.com
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isAuthorOfPublication.latestForDiscovery7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isProjectOfPublication868b4818-3efa-4edb-9202-c464d64fd38f
relation.isProjectOfPublication.latestForDiscovery868b4818-3efa-4edb-9202-c464d64fd38f

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