A revised age for the Kawakawa/Oruanui tephra, a key marker for the Last Glacial Maximum in New Zealand
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- 作者：Marcus J. V ; ergoes ; Alan G. Hogg ; David J. Lowe ; Rewi M. Newnham ; George H. Denton ; John Southon ; David J.A. Barrell ; Colin J.N. Wilson ; Matt S. McGlone ; Aidan S.R. Allan ; Peter C. Almond ; Fiona Petchey ; Kathleen Dabell ; Ann C. Dieffenbacher-Krall ; Maarten Blaauw
- 关键词：Last Glacial Maximum (LGM) ; Isochron ; Kawakawa/Oruanui tephra ; Oruanui eruption ; Paleoclimate ; Tephrochronology ; Chronostratigraphy ; 14C dating ; New Zealand ; NZ climate event stratigraphy ; Southwest Pacific ; Marine reservoir ages
- 刊名：Quaternary Science Reviews
- 出版年：2013
- 出版时间：15 August, 2013
- 年：2013
- 卷：74
- 期：Complete
- 页码：195-201
- 全文大小：2542 K
文摘
The Kawakawa/Oruanui tephra (KOT) is a key chronostratigraphic marker in terrestrial and marine deposits of the New Zealand (NZ) sector of the southwest Pacific. Erupted early during the Last Glacial Maximum (LGM), the wide distribution of the KOT enables inter-regional alignment of proxy records and facilitates comparison between NZ climatic variations and those from well-dated records elsewhere. We present 22 new radiocarbon ages for the KOT from sites and materials considered optimal for dating, and apply Bayesian statistical methods via OxCal4.1.7 that incorporate stratigraphic information to develop a new age probability model for KOT. The revised calibrated age, ¡À2?standard deviations, for the eruption of the KOT is 25,360?¡À?160?cal?yr BP. The age revision provides a basis for refining marine reservoir ages for the LGM in the southwest Pacific.