CaltechAUTHORS
  A Caltech Library Service

An inter-laboratory comparison of cosmogenic ^3He and radiogenic ^4He in the CRONUS-P pyroxene standard

Blard, P.-H. and Balco, G. and Burnard, P. G. and Farley, K. A. and Fenton, C. R. and Friedrich, R. and Jull, A. J. T. and Niedermann, S. and Pik, R. and Schaefer, J. M. and Scott, E. M. and Shuster, D. L. and Stuart, F. M. and Stute, M. and Tibari, B. and Winckler, G. and Zimmermann, L. (2015) An inter-laboratory comparison of cosmogenic ^3He and radiogenic ^4He in the CRONUS-P pyroxene standard. Quaternary Geochronology, 26 (S1). pp. 11-19. ISSN 1871-1014. http://resolver.caltech.edu/CaltechAUTHORS:20150803-073343498

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20150803-073343498

Abstract

This study reports an inter-laboratory comparison of the 3He and 4He concentrations measured in the pyroxene material CRONUS-P. This forms part of the CRONUS-Earth and CRONUS-EU programs, which also produced a series of natural reference materials for in situ produced ^(26)Al, ^(10)Be, ^(14)C, ^(21)Ne and ^(36)Cl. Six laboratories (GFZ Potsdam, Caltech Pasadena, CRPG Nancy, SUERC Glasgow, BGC Berkeley, Lamont New York) participated in this intercomparison experiment, analyzing between 5 and 22 aliquots each. Intra-laboratory results yield ^3He concentrations that are consistent with the reported analytical uncertainties, which suggests that ^3He is homogeneous within CRONUS-P. The inter-laboratory dataset (66 determinations from the 6 different labs) is characterized by a global weighted mean of (5.02 ± 0.12) × 10^9 at g^(−1) with an overdispersion of 5.6% (2σ). ^4He is characterized by a larger variability than ^3He, and by an inter-lab global weighted mean of (3.60 ± 0.18) × 10^(13) at g^(−1) (2σ) with an overdispersion of 10.4% (2σ). There are, however, some systematic differences between the six laboratories. More precisely, 2 laboratories obtained mean ^3He concentrations that are about 6% higher than the clustered other 4 laboratories. This systematic bias is larger than the analytical uncertainty and not related to the CRONUS-P material (see Schaefer et al., 2015). Reasons for these inter-laboratory offsets are difficult to identify but are discussed below. To improve the precision of cosmogenic ^3He dating, we suggest that future studies presenting cosmogenic 3He results also report the ^3He concentration measured in the CRONUS-P material in the lab(s) used in a given study.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.quageo.2014.08.004DOIArticle
http://www.sciencedirect.com/science/article/pii/S1871101414000843PublisherArticle
ORCID:
AuthorORCID
Farley, K. A.0000-0002-7846-7546
Winckler, G.0000-0001-8718-2684
Additional Information:© 2014 Elsevier B.V. Received 1 February 2014, Revised 27 August 2014, Accepted 28 August 2014, Available online 7 September 2014. This work was funded as part of the CRONUS-Earth program by the US National Science Foundation, grant EAR0345150. Pieter Vermeesch and an anonymous reviewer are thanked for their constructive comments that improved the submitted manuscript. This is CRPG contribution 2327. Editorial handling by: Fred Phillips
Funders:
Funding AgencyGrant Number
NSFEAR-0345150
Subject Keywords:Cosmogenic; 3He; Radiogenic; 4He; CRONUS-P; Standard; Calibration
Other Numbering System:
Other Numbering System NameOther Numbering System ID
CRPG2327
Record Number:CaltechAUTHORS:20150803-073343498
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150803-073343498
Official Citation:P.-H. Blard, G. Balco, P.G. Burnard, K.A. Farley, C.R. Fenton, R. Friedrich, A.J.T. Jull, S. Niedermann, R. Pik, J.M. Schaefer, E.M. Scott, D.L. Shuster, F.M. Stuart, M. Stute, B. Tibari, G. Winckler, L. Zimmermann, An inter-laboratory comparison of cosmogenic 3He and radiogenic 4He in the CRONUS-P pyroxene standard, Quaternary Geochronology, Volume 26, February 2015, Pages 11-19, ISSN 1871-1014, http://dx.doi.org/10.1016/j.quageo.2014.08.004. (http://www.sciencedirect.com/science/article/pii/S1871101414000843)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59147
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:05 Aug 2015 23:45
Last Modified:10 Jul 2017 17:23

Repository Staff Only: item control page