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Browsing Quaternary Environmental Change Group by Author "Westgate, John A."

Now showing items 1-10 of 10

The application of ICP-MS methods to tephrochronological problems

Pearce, Nicholas J. G.; Perkins, William T.; Westgate, John A.; Preece, S. J. (2004-03)

The accurate recognition of tephra deposits is of great value to Earth scientists because they facilitate stratigraphic correlation. The most useful tephra deposits form from violent volcanic eruptions; they are isochronous ...
Changing ideas on the identity and stratigraphic significance of the Sheep Creek tephra beds in Alaska and the Yukon Territory, northwestern North America

Westgate, John A.; Preece, S. J.; Froese, Duane G.; Pearce, Nicholas J. G.; Roberts, R. G.; Demuro, M.; Hart, W. K.; Perkins, William T. (2008-02)

Sheep Creek tephra (SCt) consists of inflated, rhyolitic pumice with abundant plagioclase and hornblende, lesser amounts of ferrian ilmenite and magnetite, and trace quantities of basaltic hornblende, augite, quartz, ...
Comment on “Some numerical considerations in the geochemical analysis of distal microtephra” by A.M. Pollard, S.P.E. Blockley and C.S. Lane

Westgate, John A.; Pearce, Nicholas J. G.; Bendall, Charles A. (2008-05)
Correlation and characterisation of individual glass shards from tephra deposits using trace element laser ablation ICP-MS analyses: current status and future potential

Westgate, John A.; Denton, Joanna S.; Perkins, William T.; Pearce, Nicholas J. G. (2007)

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is a high spatial resolution analytical method which has been applied to the analysis of silicic tephras. With current instrumentation, around 30 trace ...
Gold Run tephra: a Middle Pleistocene stratigraphic and paleoenviromental marker across west-central Yukon Territory, Canada

Westgate, John A.; Preece, S. J.; Froese, Duane G.; Telka, A. M.; Storer, J. E.; Pearce, Nicholas J. G.; Enkin, R. J.; Jackson, L. E.; LeBarge, W.; Perkins, William T. (2009-06-01)

Gold Run tephra has been found at Thistle Creek, Sixtymile River, and the Klondike goldfields of west-central Yukon, Canada. It is a hornblende-bearing rhyolitic tephra with thicknesses of up to 10 cm at each site, suggesting ...
Identification of Aniakchak (Alaska) tephra in Greenland ice core challenges the 1645 BC date for Minoan eruption of Santorini

Pearce, Nicholas J. G.; Eastwood, W. J.; Preece, S. J.; Westgate, John A. (2006-03)

This paper offers an alternative to the use of geomorphological and sedimentological evidence for the reconstruction of flood and low flow frequencies. It is based on a technique developed to estimate the hydrological ...
The Klondike goldfields and Pleistocene environments of Beringia

Froese, Duane G.; Zazula, Grant D.; Westgate, John A.; Preece, Shari J.; Sanborn, Paul T.; Reyes, Alberto V.; Pearce, Nicholas J. G. (2009-08-01)

The Klondike goldfields of Yukon, Canada, contain a key record of Pleistocene Beringia, the region of Alaska, Siberia, and Yukon that remained largely unglaciated during the late Cenozoic. A concentration of mining exposures, ...
Mid-Pleistocene silicic tephra beds in the Auckland region, New Zealand: Their correlation and origins based on the trace element analyses of single glass shards

Pearce, Nicholas J. G.; Westgate, John A.; Alloway, Brent V. (2008-02)

The trace element composition of individual glass shards from twelve distinct mid-Pleistocene silicic tephra beds from the Auckland region, New Zealand, has been determined by laser ablation (LA) ICP-MS analysis. This is ...
Trace-element composition of single glass shards in distal Minoan tephra from SW Turkey

Perkins, William T.; Pearce, Nicholas J. G.; Eastwood, W. J.; Westgate, John A. (2002)

Volcanic glass from the seventeenth century BC (c. 3600 BP) Minoan eruption of Santorini (Thera) has been recovered from a 4 cm thick tephra deposit at Gölhisar Gölü, a small lake in SW Turkey. Analysis of single grains ...
The Variegated (VT) tephra : A new regional marker for middle to late Marine Isotope Stage 5 across Yukon and Alaska

Jensen, Britta J. L.; Preece, Shari J.; Lamothe, Michel; Pearce, Nick J. G.; Froese, Duane G.; Westgate, John A.; Schaefer, Janet; Begét, Jim (2011-12-20)

The Variegated (VT) tephra, likely sourced from the eastern Aleutian arc, has a geographic distribution that places it amongst the most widespread tephra beds in eastern Beringia. First identified in the Fairbanks area of ...

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