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dc.contributor.authorWang, Danlei
dc.contributor.authorSchwark, Lorenz
dc.contributor.authorRuebsam, W.
dc.contributor.authorHolman, Alex
dc.contributor.authorBöttcher, M.E.
dc.contributor.authorIdiz, E.
dc.contributor.authorCoolen, Marco
dc.contributor.authorGrice, Kliti
dc.date.accessioned2023-01-24T06:29:52Z
dc.date.available2023-01-24T06:29:52Z
dc.date.issued2022
dc.identifier.citationWang, D. and Schwark, L. and Ruebsam, W. and Holman, A.I. and Böttcher, M.E. and Idiz, E. and Coolen, M.J.L. et al. 2022. Eccentricity paced paleoenvironment evolution and microbial community structure in the Gulf of Mexico during the outgoing Early Eocene Climate Optimum. Earth and Planetary Science Letters. 599: ARTN 117857.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/90134
dc.identifier.doi10.1016/j.epsl.2022.117857
dc.description.abstract

Orbital-driven climate fluctuations and associated variations in the carbon cycle over short- and long-term time scales can be recorded in sedimentary archives. Bulk geochemical, biomarker, and stable isotope signatures in sediments deposited at the end of the Early Eocene Climatic Optimum (EECO) recovered from the Chicxulub impact crater in the Gulf of Mexico show a strong relationship with Milankovitch cycles, which play a critical role in controlling climatic and environmental oscillations. Our study represents the first highly spatially-resolved biomarker and bulk geochemical record from the EECO. The bulk δ13Ckerogen data records the Milankovitch eccentricity-paced variability of continental weathering throughout the studied interval. Biomarkers (and indices) indicative of redox conditions [e.g., pristane (Pr)/phytane (Ph) ratios], water column stratification and/or salinity conditions (e.g., Gammacerane Index), photic zone euxinia (e.g., isorenieratane, chlorobactene, and okenane) and those that can differentiate between algal communities such as dinoflagellates (dinosteranes), marine pelagophytes (24-n-propylcholestane), chlorophyte algae (24-iso-propylcholestane), and prasinophytes (C28/C29 sterane ratios) show changes controlled by orbital eccentricity frequencies. In particular, eccentricity maxima were marked by more reducing/salinity stratified water conditions, photic zone euxinic episodes, and higher (relative) abundances of prasinophytes. In contrast, eccentricity minima were marked by more oxic water conditions and an increase in cyanobacterial markers. The δ13C offset observed between phytane and C17–C19 n-alkanes may represent shifts between a predominance of autotrophic vs. heterotrophic communities controlled by orbital eccentricity. The direct response of molecular and isotopic composition of organic matter to orbitally controlled climate change in the early Eocene could be proven here for the first time and may be more prevalent in Paleogene sediments worldwide.

dc.languageEnglish
dc.publisherELSEVIER
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DP180100982
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectGeochemistry & Geophysics
dc.subjectbiomarkers
dc.subjectcompound specific stable isotope
dc.subjectorbital cycles
dc.subjectorbital driven paleoenvironmental changes
dc.subjectpaleoproductivity
dc.subjectASTRONOMICAL CALIBRATION
dc.subjectBIOMARKERS
dc.subjectSEDIMENTS
dc.subjectSEA
dc.subjectIDENTIFICATION
dc.subjectINDICATORS
dc.subjectINSOLATION
dc.subjectRECORD
dc.subjectVALUES
dc.subjectBASIN
dc.titleEccentricity paced paleoenvironment evolution and microbial community structure in the Gulf of Mexico during the outgoing Early Eocene Climate Optimum
dc.typeJournal Article
dcterms.source.volume599
dcterms.source.issn0012-821X
dcterms.source.titleEarth and Planetary Science Letters
dc.date.updated2023-01-24T06:29:50Z
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidHolman, Alex [0000-0001-5687-1268]
curtin.contributor.orcidCoolen, Marco [0000-0002-0417-920X]
curtin.contributor.orcidGrice, Kliti [0000-0003-2136-3508]
curtin.contributor.researcheridCoolen, Marco [B-8263-2015]
curtin.contributor.researcheridGrice, Kliti [L-2455-2016]
curtin.identifier.article-numberARTN 117857
dcterms.source.eissn1385-013X
curtin.contributor.scopusauthoridSchwark, Lorenz [7004473576]
curtin.contributor.scopusauthoridHolman, Alex [55369807700]
curtin.contributor.scopusauthoridCoolen, Marco [6603365440]
curtin.contributor.scopusauthoridGrice, Kliti [7005492625]
dc.date.embargoEnd2024-10-21


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