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dc.contributor.authorMoriwaki, Hiroshi
dc.contributor.authorSuzuki, Takehiko
dc.contributor.authorMurata, Masanori
dc.contributor.authorIkehara, Minoru
dc.contributor.authorMachida, Hiroshi
dc.contributor.authorLowe, David J.
dc.date.accessioned2011-04-14T02:51:08Z
dc.date.available2011-04-14T02:51:08Z
dc.date.issued2011
dc.identifier.citationMoriwaki, H., Suzuki, T., Murata, M., Ikehara, M., Machida, H. & Lowe, D.J. (2011). Sakurajima-Satsuma (Sz-S) and Noike-Yumugi (N-Ym) tephras: new tephrochronological marker beds for the last deglaciation, southern Kyushu, Japan. Quaternary International, available online 4 April 2011.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5278
dc.description.abstractTwo prominent tephras, Sakurajima-Satsuma (Sz-S) erupted from Sakurajima volcano and Noike-Yumugi (N-Ym) erupted from Kuchierabujima Island, provide new key marker beds for dating and synchronizing palaeoenvironmental and archaeological records in the last deglaciation in southern Japan. These tephras were identified on the basis of glass major-element compositions in two distal areas, a marine core (IMAGES MD98-2195) in the northern part of the East China Sea and on the central part of Tanegashima Island, and related their stratigraphic positions to the marine oxygen isotope-based chronology. In MD98-2195, Sz-S, 0.8 cm in thickness at 9.12 m depth and N-Ym, 3 cm in thickness at 9.30 m depth, are both white, vitric, ash-grade tephras. On Tanegashima Island, Sz-S, 10 cm in thickness and N-Ym, 3 cm in thickness, are stratigraphically constrained by well-characterised marker tephras Kikai-Akahoya (7,300 cal BP) and Aira-Tn (29,000 cal BP). Sz-S is rhyolitic and homogeneous on the basis of glass major-element compositions assayed by electron microprobe. Pumiceous glass shards predominant in distal Sz-S tephra indicate that it derived from pumice fall units that correspond to pumiceous and phreatomagmatic fine ash units constituting proximal Sz-S tephra. N-Ym is rhyolitic and glass major-element analyses reveal compositional diversity between units, suggesting that the lower and middle tephra units dispersed to the east, whereas the upper unit was dispersed north to north-west from the vent. Stratigraphically, Sz-S occurs at around the start of the late-glacial reversal (cooling) in oxygen isotope records of MD98-2195, corresponding to the end of GI-1 and the start of GS-1 in the ice-core events of NGRIP (GICC05), consistent with a terrestrial age of ˜12,800 cal BP. Based on the oxygen isotope stratigraphy, the tephra identified in the core as N-Ym at 9.30 m depth is close to the end of Greenland GI-1 and hence has an age of ˜13,000 cal BP, but on Kuchierabujima Island it has an age based on ¹⁴C assay of charcoal of c. 14,900 cal BP. Although this age discrepancy (14.9 vs 13.0 cal ka) needs resolution, the occurrence in core MD98-2195 of N-Ym shows that it is more widespread than hitherto demonstrated. The widespread distributions and key stratigraphic positions for the two marker tephras indicate that they are thus critical isochrons for precise correlation of palaeoenvironmental changes and prehistoric cultural events during the last deglaciation in southern Kyushu, and for relating such changes and events to the ice-core chronology via the marine oxygen isotope chronostratigraphy.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherElsevieren_NZ
dc.relation.urihttp://www.sciencedirect.com/science/journal/10406182
dc.rightsThis is an author’s accepted version of an article published in the journal: Quaternary International. © 2011 Elsevier.en_NZ
dc.sourceInternational Field Conference and Workshop on Tephrochronology, Volcanism, and Human Activity. Active Tephra in Kyushuen_NZ
dc.subjectmarine coreen_NZ
dc.subjecttephraen_NZ
dc.subjecttephrochronologyen_NZ
dc.subjectidentificationen_NZ
dc.subjectlast deglaciationen_NZ
dc.subjectsouthern Kyushuen_NZ
dc.subjectIMTIMATEen_NZ
dc.titleSakurajima-Satsuma (Sz-S) and Noike-Yumugi (N-Ym) tephras: new tephrochronological marker beds for the last deglaciation, southern Kyushu, Japanen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1016/j.quaint.2011.03.046en_NZ
pubs.begin-page203en_NZ
pubs.elements-id19532
pubs.end-page212en_NZ
pubs.finish-date2010-05-17en_NZ
pubs.start-date2010-05-09en_NZ


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