Peru margin palaeoceanography since the Last Glacial Maximum and the long-term implications for El Niño-Southern Oscillation

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dc.contributor.authorSkilbeck, Gen_AU
dc.contributor.authorGutierrez, Den_AU
dc.contributor.authorRein, Ben_AU
dc.contributor.authorSifeddine, Aen_AU
dc.contributor.authorSalvatteci, Ren_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorDruffel, Een_AU
dc.contributor.authorSanchez-Cabeza, JAen_AU
dc.contributor.authorMorgenstern, Uen_AU
dc.contributor.authorMurray, Ben_AU
dc.contributor.authorDunbar, Ren_AU
dc.date.accessioned2024-02-28T01:11:55Zen_AU
dc.date.available2024-02-28T01:11:55Zen_AU
dc.date.issued2012-08-05en_AU
dc.date.statistics2020-01-31en_AU
dc.description.abstractLaminated-sediment cores from nine shelf sites along the Peru continental margin between 11◦S and 14.5◦S, reveal a 20,000 yr inter-millennial scale pattern of sediment accumulation consistent with other equatorial and south Pacific-rim indicators of long-term ENSO behaviour. Nearly 200 carbon-14 dates define 6 distinct periods during the Holocene-LGM each characterised by linear sedimentation rates that can be regionally correlated between the cores. The early (∼10–8.5 cal Kyr BP) and late (∼2.5–0cal Kyr BP) Holocene, and early Deglaciation (15.5–20Kyr BP) were periods of relatively rapid accumulation (∼80 and 100+ cm/ka), with thin, rapidly deposited laminae, whereas from ∼4.5 to ∼2.5 cal Kyr BP sediments accumulated at ∼20 cm/ka. The middle Holocene (∼8.5 to 4.5 cal Kyr BP) was characterised by very slow sediment deposition, erosion and slumping. The latter period corresponds with the mid Holocene minima in March-September equatorial insolation. Sedimentation data are supplemented by 2 mm-spaced scanning XRF records that confirm the significance of the millennial-scale associations and support a long-term ENSO-like (alternating flooding and drought from continental south America) interpretation. We suggest that this regional pattern indicates millennial changes in nearshore ocean currents with the middle Holocene representing a period of intensified upwelling.en_AU
dc.identifier.citationSkilbeck, G., Gutierrez, D., Rein, B., Sifeddine, A., Salvattechi, R., Fink, D., Druffel, E., Sanchez-Cabeza, J.-A., Morgenstern, W., Murray, B., & Dunbar, R. (2012). Peru margin palaeoceanography since the Last Glacial Maximum and the long-term implications for El Niño-Southern Oscillation. Paper presented to the 34th International Geological Congress 2012, "Unearthing our Past and Future - Resourcing Tomorrow". 5-10 August 2012 . Brisbane, Australia. (pp. 704).en_AU
dc.identifier.conferenceenddate2012-08-10en_AU
dc.identifier.conferencename34th International Geological Congress 2012, "Unearthing our Past and Future - Resourcing Tomorrow"en_AU
dc.identifier.conferenceplaceBrisbane, Australiaen_AU
dc.identifier.conferencestartdate2012-08-05en_AU
dc.identifier.otherGC124149en_AU
dc.identifier.pagination704en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15466en_AU
dc.language.isoenen_AU
dc.publisherAustralian Geosciences Councilen_AU
dc.subjectPeruen_AU
dc.subjectPleistocene epochen_AU
dc.subjectSouthern Oscillationen_AU
dc.subjectCarbon 14en_AU
dc.subjectSedimentsen_AU
dc.subjectGeologic depositsen_AU
dc.subjectErosionen_AU
dc.subjectFloodsen_AU
dc.subjectX-ray fluorescence analysisen_AU
dc.subjectUpwellingen_AU
dc.titlePeru margin palaeoceanography since the Last Glacial Maximum and the long-term implications for El Niño-Southern Oscillationen_AU
dc.typeConference Abstracten_AU
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