Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/141671
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dc.contributor.authorWotzlaw, Jörn-Frederiken_US
dc.contributor.authorGuillong, Marcelen_US
dc.contributor.authorBalashova, Annaen_US
dc.contributor.authorForni, Francescaen_US
dc.contributor.authorDunkl, Istvánen_US
dc.contributor.authorMattsson, Hannes B.en_US
dc.contributor.authorBachmann, Olivieren_US
dc.date.accessioned2020-06-10T02:20:15Z-
dc.date.available2020-06-10T02:20:15Z-
dc.date.issued2018-
dc.identifier.citationWotzlaw, J.-F., Guillong, M., Balashova, A., Forni, F., Dunkl, I., Mattsson, H. B., & Bachmann, O. (2019). In-situ garnet 238U-230Th geochronology of Holocene silica-undersaturated volcanic tuffs at millennial-scale precision. Quaternary Geochronology, 50, 1-7. doi:10.1016/j.quageo.2018.10.004en_US
dc.identifier.issn1871-1014en_US
dc.identifier.urihttps://hdl.handle.net/10356/141671-
dc.description.abstractRadioisotopic dates for Late Pleistocene to Holocene silica-undersaturated volcanic rocks are often imprecise, limiting our ability to assess the frequency of eruptions in alkaline volcanic provinces, evaluate related volcanic risk and date associated archaeological sites. Here, we present a new approach to dating alkaline volcanic rocks employing 238U-230Th disequilibrium dating of Ca-rich garnet phenocrysts by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). We document analytical protocols and apply this technique to date magmatic garnets from the 472 AD Pollena eruption of Vesuvius (Southern Italy) and from the Engare Sero Footprint Tuff, a volcaniclastic unit attributed to Oldoinyo Lengai (Northern Tanzania). Garnet phenocrysts from the Pollena phonolite yield a well-defined U-Th isochron with a date of 2.28 ± 0.71 ka (1σ) that is indistinguishable from the historical date and suggests that garnet crystallized close to eruption with a pre-eruption residence time of less than 1.6 kyr. Garnets from the Engare Sero Footprint Tuff yield a U-Th isochron date of 4.91 ± 0.58 ka (1σ). This date is compatible with 14C and 40Ar/39Ar dates that bracket tuff deposition to between ∼5 and ∼19 ka but confidently constrains the age of the Engare Sero Footprint Tuff to the mid-Holocene. These examples demonstrate the potential of this new approach for dating Late Pleistocene to Holocene silica-undersaturated volcanic rocks at millennial-scale precision and for investigating magma chamber processes beneath active alkaline volcanoes.en_US
dc.language.isoenen_US
dc.relation.ispartofQuaternary Geochronologyen_US
dc.rights© 2018 Elsevier B.V. All rights reserved.en_US
dc.subjectScience::Geologyen_US
dc.titleIn-situ garnet 238U-230Th geochronology of Holocene silica-undersaturated volcanic tuffs at millennial-scale precisionen_US
dc.typeJournal Articleen
dc.contributor.researchEarth Observatory of Singaporeen_US
dc.identifier.doi10.1016/j.quageo.2018.10.004-
dc.identifier.scopus2-s2.0-85056188943-
dc.identifier.volume50en_US
dc.identifier.spage1en_US
dc.identifier.epage7en_US
dc.subject.keywordsU-Th Geochronologyen_US
dc.subject.keywordsMagmatic Garneten_US
item.fulltextNo Fulltext-
item.grantfulltextnone-
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