Rodger Sparks

GNS Science

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Martin Manning

Victoria University of Wellington

Ramsey Oxford

Pavel P. Povinec

Comenius University Bratislava

Pieter Meiert Grootes

Kiel University

J. C. Vogel

United States Geological Survey

J. van der Plicht

University of Groningen

Lower Hutt

Dialyse Centrum Groningen

David C. Lowe

AstraZeneca (United Kingdom)

New Zealand

Centre for Movement Disorders

Ann P. McNichol

Woods Hole Oceanographic Institution

Cooperative Institutions

GNS Science

University of Arizona

National Oceanic and Atmospheric Administration

Victoria University of Wellington

United States Geological Survey

Institut de l'Information Scientifique et Technique

Dialyse Centrum Groningen

Australian National University

Pennsylvania State University

National Institute of Water and Atmospheric Research

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Cyclic Variation in Discharge Rate during Volcanic Eruptions: Experimental, Theoretical and Field Observations

AGU Fall Meeting Abstracts (2005)

J. C. Phillips Tanda Kidd Rodger Sparks Oleg Melnik

Variation (astronomy)

Vulcanian eruption

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Development of Sample Pretreatment of Silk for Radiocarbon Dating

Radiocarbon (2008)

Kyeong Ja Kim John Southon Mineo Imamura Rodger Sparks

We have developed sample pretreatments for silk for radiocarbon dating. Characteristics of silk under different types of pretreatment were investigated, as well as the behavior of dye and possible contaminants. We found that dye could be removed completely, together with all other foreign materials bigger than 1.2 μm, using a glass microfiber filter after decomposition with 6N HCl. The decomposed proteins were concentrated using Centriprep ® ultrafiltration concentrators with 3 different molecular weight cut-offs. By taking a molecular weight fraction—which selects for secondary structures of silk protein— 14 C dating of silk samples can be made more reliable. This study confirms that uniformly fractured polypeptide chains of silk provide an appropriate fraction for 14 C age dating to select silk protein against dye particles and undecomposed foreign contaminants.

Ultrafiltration (renal)

Fraction (chemistry)

10.1017/s0033822200043411

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Environmental Influences on Dietary Carbon and ¹⁴C Ages in Modern Rats and Other Species

Radiocarbon (2001)

Nancy Beavan Bruce McFadgen Rodger Sparks

Diet can play a significant role in anomalous radiocarbon ages derived from bone and other tissues when the food web incorporates depleted 14 C reservoirs, such as the marine environment. Dietary effects from a post-bomb carbon variation have also been found in modern invertebrates and populations of Rattus exulans (Beavan and Sparks 1998). We now present the effect on absolute percent modern (pMC) and the conventional radiocarbon age (CRA) of a modern aquatic/terrestrial food web in a volcanic zone of the North Island, New Zealand. At Lake Taupo, geothermal venting transfers 14 C depleted carbon to lake waters, which aquatic plants fix into the food chain; depleted 14 C is shown to then pass on to shellfish, waterfowl, and Norway rat ( Rattus norvegicus ). The geothermally induced 14 C variations from modern atmospheric pMC and CRA can increase apparent 14 C ages by >2000 years.

Accelerator mass spectrometry

Carbon fibers

10.1017/s0033822200031581

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Citations (37)

Pyroclastic Flow Generated Tsunami Waves Detected by CALIPSO Borehole Strainmeters at Soufriere Hills, Montserrat During Massive Dome Collapse: Numerical Simulations and Observations

AGUFM (2004)

E. J. van Boskirk B. Voight P. Watts Christina Widiwijayanti G. S. Mattioli

Dome (geology)

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Editorial Board

Radiocarbon (2005)

Édouard Bard Christopher Bronk Ramsey Oxford Owen Davis Ellen R. M. Druffel

An abstract is not available for this content so a preview has been provided. As you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

On board

Editorial board

10.1017/s0033822200052115

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Editorial Board

Radiocarbon (2002)

Édouard Bard Christopher Bronk Ramsey Oxford Owen Davis Ellen R. M. Druffel

An abstract is not available for this content so a preview has been provided. As you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

10.1017/s0033822200064614

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¹⁴C Calibration in the Southern Hemisphere and the Date of the Last Taupo Eruption: Evidence from Tree-Ring Sequences

Radiocarbon (1995)

Rodger Sparks W. H. Melhuish James W. McKee John C. Ogden Jonathan Palmer

Tree rings from a section of Prumnopitys taxifolia (matai) covering the period ad 1335–1745 have been radiocarbon dated and used to generate a 14 C calibration curve for southern hemisphere wood. Comparison of this curve with calibration data for northern hemisphere wood does not show a systematic difference between 14 C ages measured in the northern and southern hemispheres. A floating chronology covering 270 yr and terminating at the last Taupo (New Zealand) eruption, derived from a sequence of 10-yr samples of tree rings from Phyllocladus trichomanoides (celery pine, or tanekaha), is also consistent with the absence of a systematic north-south difference, and together with the matai data, fixes the date of the Taupo eruption at ad 232 ± 15.

Chronology

Sequence (biology)

10.1017/s0033822200030599

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Citations (90)

Late Quaternary evolution of the Rotoaira Basin, northern Tongariro ring plain, New Zealand

New Zealand Journal of Geology and Geophysics (2004)

Jérôme A. Lecointre V. E. Neall R. Cleland Wallace Mike Elliot Rodger Sparks

Abstract The last 100 000 yr record of volcaniclastic sedimentation in the Rotoaira Basin reflects the critical role played by tectonic and eruptive activity that led to: (1) the catastrophic emplacement of Te Whaiau Formation (60–55 ka); (2) major episodes of effusive activity (c. 30 ka and c. 15 ka); and (3) syn‐ and post‐eruptive lahar aggradation on the shores of Lake Rotoaira. Stratigraphic unconformities, fluvial and aeolian reworking, and subsequent volcanogenic sedimentation indicate that climate change driven periods of erosion contributed significantly to the evolution of the landscape during the late Quaternary. Waters that accumulated in a newly expanded graben formed Lake Rotoaira. An attempt to core through the sediments on the lake's floor revealed a >6.5 m thick mantling of Taupo ignimbrite, restricting chronostratigraphic sampling to the last 1.85 ka. Lake Rotoaira pollen profiles record: (1) the destruction of the indigenous forest by the Taupo ignimbrite eruption; (2) the following period of vegetation recovery (c. 300 yr); and (3) periods of human occupation of the lakeshores (bracken spores and Pinus pollen) in the younger sediments. Coarse sand generated by the 1995–96 tephra‐producing Ruapehu eruptions also contributed to the recent lake sedimentation.

Tephrochronology

Isopach map

10.1080/00288306.2004.9515075

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Citations (10)

(super 10) Be investigations of sediments, soils and loess at GNS.

Radiocarbon (2006)

Ian Graham R. G. Ditchburn Rodger Sparks N.E. Whitehead

Absolute dating

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