J
John A. Westgate
Researcher at University of Toronto
Publications - 120
Citations - 8126
John A. Westgate is an academic researcher from University of Toronto. The author has contributed to research in topics: Tephra & Tephrochronology. The author has an hindex of 49, co-authored 116 publications receiving 7609 citations. Previous affiliations of John A. Westgate include University of Auckland.
Papers
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Journal ArticleDOI
A Compilation of New and Published Major and Trace Element Data for NIST SRM 610 and NIST SRM 612 Glass Reference Materials
Nicholas J. G. Pearce,William T. Perkins,John A. Westgate,Michael P. Gorton,Simon E. Jackson,Clive R. Neal,Simon P. Chenery +6 more
TL;DR: In this article, the authors present a compilation of trace element data from approximately sixty published works for NIST SRM 611 and NISTSRM 613 and provide useful new working values for these reference materials.
Journal ArticleDOI
Eruptive history of Earth's largest Quaternary caldera (Toba, Indonesia) clarified
TL;DR: In this article, single-grain laser-fusion analyses of individual sanidine phenocrysts from the two youngest Toba (Indonesia) tuffs yield mean ages of 73 plus minus 4 and 501 plus minus 5 ka.
Book ChapterDOI
Correlation Techniques in Tephra Studies
TL;DR: The strong susceptibility of tephra to reworking further argues for use of several stratigraphic controls in order to safeguard against gross errors as discussed by the authors, and the physicochemical properties of their glass shards and phenocrysts agree.
Journal ArticleDOI
All toba tephra occurrences across peninsular India belong to the 75,000 yr B.P. eruption
John A. Westgate,Philip A. Shane,Nicholas J. G. Pearce,William T. Perkins,Ravi Korisettar,Craig A. Chesner,Martin Williams,Subhrangsu K. Acharyya +7 more
TL;DR: The results unequivocally demonstrate that all the presently known Toba tephra occurrences in peninsular India belong to the 75,000 yr B.P. Toba eruption as discussed by the authors.
Journal ArticleDOI
A 3 M.Y. Record of Pliocene-Pleistocene Loess in Interior Alaska
TL;DR: In this article, isothermal plateau fission track ages, determined on glass shards from tephra beds, in conjunction with tephrostratigraphic and magnetostratigraphic techniques, indicate that loess deposition began in the late Pliocene-an antiquity previously unsuspected.