Stratigraphy and age-dating of the Kiriwina Formation,Woodlark Island, Papua New Guinea

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dc.contributor.authorMcGeeney, Den_AU
dc.contributor.authorGraham, ITen_AU
dc.contributor.authorCohen, DDen_AU
dc.contributor.authorSpencer, Len_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorWilliams, Aen_AU
dc.date.accessioned2022-02-23T02:01:18Zen_AU
dc.date.available2022-02-23T02:01:18Zen_AU
dc.date.issued2012-08en_AU
dc.date.statistics2022-01-28en_AU
dc.description.abstractThe Upper-Pleistocene Kiriwina Formation (KFm) of Woodlark Island, Papua New Guinea, is a complex, largely transitional shallow marine to near-shore terrestrial sedimentary unit. This study provides the first detailed analysis of the KFm on any KFm hosting island of the Solomon Sea. Highly elevated Au contents (up to 10 ppm) occur within various sub-units. The KFm covers most of the island’s surface, has a thickness of 0–90m, and unconformably overlies the mid-Miocene Okiduse Volcanics that host carbonate-base metal-Au epithermal mineralization. The formation has undergone rapid horizontal and vertical changes in the sedimentary environment and style; individual units and subunits occur as repeated lenses of conglomerates, gritstones, beach sands, silts, lagoonal clays, and mixed clays/carbonates. The KFm is capped by porous and permeable shallow marine limestones, which in places have undergone karst development. Detailed mapping indicates previously unknown near-shore terrestrial subunits that may comprise a large part of the sequence. Andesitic fragments are widely dispersed throughout each member and subunit. The main clay in the Talpos Marine Clay Member is nontronite, an Fe-rich smectite. New C14 radiometric age-dating has determined the KFm to be 47,130–60,300 yrs BP at Kulumadau and > 70,000 yrs BP at Busai. These ages were used as a basis to determine an average uplift rate of 1.06m/1000 years.en_AU
dc.identifier.citationMcGeeney, D., Graham, I., Cohen, D., Spencer, L., Jacobsen, G., & Williams, A. (2012). Stratigraphy and age-dating of the Kiriwina Formation,Woodlark Island, Papua New Guinea. Paper presented to the 34th International Geological Congress 2012, "Unearthing our Past and Future - Resourcing Tomorrow". 5-10 August 2012 . Brisbane, Australia. (pp. 3507).en_AU
dc.identifier.conferenceenddate10 August 2012en_AU
dc.identifier.conferencename34th International Geological Congress 2012, 'Unearthing our Past and Future - Resourcing Tomorrow'en_AU
dc.identifier.conferenceplaceBrisbane, Australiaen_AU
dc.identifier.conferencestartdate5 August 2012en_AU
dc.identifier.otherGC123734en_AU
dc.identifier.pagination3507en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12852en_AU
dc.language.isoenen_AU
dc.publisherAustralian Geosciences Councilen_AU
dc.subjectAge estimationen_AU
dc.subjectPapua New Guineaen_AU
dc.subjectPleistocene epochen_AU
dc.subjectAquatic ecosystemsen_AU
dc.subjectTerrestrial ecosystemsen_AU
dc.subjectIslandsen_AU
dc.subjectSurface areaen_AU
dc.subjectCavesen_AU
dc.subjectClaysen_AU
dc.subjectSmectiteen_AU
dc.titleStratigraphy and age-dating of the Kiriwina Formation,Woodlark Island, Papua New Guineaen_AU
dc.typeConference Abstracten_AU
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