Articles | Volume 2, issue 2
https://doi.org/10.5194/gchron-2-231-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-2-231-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
The Isotopx NGX and ATONA Faraday amplifiers
Stephen E. Cox
CORRESPONDING AUTHOR
Lamont-Doherty Earth Observatory, the Earth Institute at Columbia University, 61 Route 9W, Palisades, NY 10964, USA
Sidney R. Hemming
Lamont-Doherty Earth Observatory, the Earth Institute at Columbia University, 61 Route 9W, Palisades, NY 10964, USA
Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027, USA
Damian Tootell
Isotopx, Ltd., Dalton House, Dalton Way, Middlewich CW10 0HU, UK
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Noble gases are largely excluded from minerals during rock formation, but they are produced by certain radioactive decay schemes and trapped in mineral lattices. However, they are present in the atmosphere, which means that they can be adsorbed or trapped by physical processes. We present details of a troublesome trapping mechanism for helium during sample crushing and show when it can be ignored and how it can be easily avoided during common laboratory procedures.
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Manuscript not accepted for further review
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We present data from fieldwork completed in 2002 for a glacial lake in the Torngat Mountains (Northern Quebec and Labrador, Canada). We dated the lake to ~56 ± 3 ka and estimated the freshwater volume that may have been released during an outburst flood. The location of this glacial lake is surprising because the Torngat Mountains are considered a site of glacial inception, and this shoreline suggests the region was not ice-covered throughout the North American ice sheet growth phase.
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Short summary
We show results from a new type of ion detector technology for mass spectrometry that allows us to measure ion beams more precisely. This technology expands the range of ages we can measure using a single instrument and makes it possible to measure those ages – including all required corrections and adjustments – with more confidence. We show measurements of widely used standard materials for Ar / Ar, including air and synthetic standard gas, to illustrate the capabilities of the new detectors.
We show results from a new type of ion detector technology for mass spectrometry that allows us...