GHR1 Zircon – A New Eocene Natural Reference Material for Microbeam U-Pb Geochronology and Hf Isotopic Analysis of Zircon

Michael P. Eddy, Mauricio Ibañez-Mejia, Seth D. Burgess, Matthew A. Coble, Umberto G. Cordani, Joel DesOrmeau, George E Gehrels, Xianhua Li, Scott MacLennan, Mark Pecha, Kei Sato, Blair Schoene, Victor A. Valencia, Jeffrey D. Vervoort, Tiantian Wang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present multitechnique U-Pb geochronology and Hf isotopic data from zircon separated from rapakivi biotite granite within the Eocene Golden Horn batholith in Washington, USA. A weighted mean of twenty-five Th-corrected 206Pb/238U zircon dates produced at two independent laboratories using chemical abrasion-isotope dilution-thermal ionisation mass spectrometry (CA-ID-TIMS) is 48.106 ± 0.023 Ma (2s analytical including tracer uncertainties, MSWD = 1.53) and is our recommended date for GHR1 zircon. Microbeam 206Pb/238U dates from laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and secondary ion mass spectrometry (SIMS) laboratories are reproducible and in agreement with the CA-ID-TIMS date to within < 1.5%. Solution multi-collector ICP-MS (MC-ICP-MS) measurements of Hf isotopes from chemically purified aliquots of GHR1 yield a mean 176Hf/177Hf of 0.283050 ± 17 (2s, n = 10), corresponding to a εHf0 of +9.3. Hafnium isotopic measurements from two LA-ICP-MS laboratories are in agreement with the solution MC-ICP-MS value. The reproducibility of 206Pb/238U and 176Hf/177Hf ratios from GHR1 zircon across a variety of measurement techniques demonstrates their homogeneity in most grains. Additionally, the effectively limitless reserves of GHR1 material from an accessible exposure suggest that GHR1 can provide a useful reference material for U-Pb geochronology of Cenozoic zircon and Hf isotopic measurements of zircon with radiogenic 176Hf/177Hf.

Original languageEnglish (US)
JournalGeostandards and Geoanalytical Research
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Geochronology
isotopic analysis
geochronology
Eocene
zircon
Isotopes
Inductively coupled plasma mass spectrometry
mass spectrometry
isotope
Laser ablation
abrasion
Abrasion
ablation
Dilution
Ionization
dilution
ionization
Hafnium
laser
Laboratory Chemicals

Keywords

  • Hf isotope ratios
  • ID-TIMS
  • LA-ICP-MS
  • MC-ICP-MS
  • reference material
  • secondary ion mass spectrometry
  • U-Pb geochronology
  • zircon

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

Cite this

Eddy, M. P., Ibañez-Mejia, M., Burgess, S. D., Coble, M. A., Cordani, U. G., DesOrmeau, J., ... Wang, T. (Accepted/In press). GHR1 Zircon – A New Eocene Natural Reference Material for Microbeam U-Pb Geochronology and Hf Isotopic Analysis of Zircon. Geostandards and Geoanalytical Research. https://doi.org/10.1111/ggr.12246

GHR1 Zircon – A New Eocene Natural Reference Material for Microbeam U-Pb Geochronology and Hf Isotopic Analysis of Zircon. / Eddy, Michael P.; Ibañez-Mejia, Mauricio; Burgess, Seth D.; Coble, Matthew A.; Cordani, Umberto G.; DesOrmeau, Joel; Gehrels, George E; Li, Xianhua; MacLennan, Scott; Pecha, Mark; Sato, Kei; Schoene, Blair; Valencia, Victor A.; Vervoort, Jeffrey D.; Wang, Tiantian.

In: Geostandards and Geoanalytical Research, 01.01.2018.

Research output: Contribution to journalArticle

Eddy, MP, Ibañez-Mejia, M, Burgess, SD, Coble, MA, Cordani, UG, DesOrmeau, J, Gehrels, GE, Li, X, MacLennan, S, Pecha, M, Sato, K, Schoene, B, Valencia, VA, Vervoort, JD & Wang, T 2018, 'GHR1 Zircon – A New Eocene Natural Reference Material for Microbeam U-Pb Geochronology and Hf Isotopic Analysis of Zircon', Geostandards and Geoanalytical Research. https://doi.org/10.1111/ggr.12246
Eddy, Michael P. ; Ibañez-Mejia, Mauricio ; Burgess, Seth D. ; Coble, Matthew A. ; Cordani, Umberto G. ; DesOrmeau, Joel ; Gehrels, George E ; Li, Xianhua ; MacLennan, Scott ; Pecha, Mark ; Sato, Kei ; Schoene, Blair ; Valencia, Victor A. ; Vervoort, Jeffrey D. ; Wang, Tiantian. / GHR1 Zircon – A New Eocene Natural Reference Material for Microbeam U-Pb Geochronology and Hf Isotopic Analysis of Zircon. In: Geostandards and Geoanalytical Research. 2018.
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AU - Eddy, Michael P.

AU - Ibañez-Mejia, Mauricio

AU - Burgess, Seth D.

AU - Coble, Matthew A.

AU - Cordani, Umberto G.

AU - DesOrmeau, Joel

AU - Gehrels, George E

AU - Li, Xianhua

AU - MacLennan, Scott

AU - Pecha, Mark

AU - Sato, Kei

AU - Schoene, Blair

AU - Valencia, Victor A.

AU - Vervoort, Jeffrey D.

AU - Wang, Tiantian

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N2 - We present multitechnique U-Pb geochronology and Hf isotopic data from zircon separated from rapakivi biotite granite within the Eocene Golden Horn batholith in Washington, USA. A weighted mean of twenty-five Th-corrected 206Pb/238U zircon dates produced at two independent laboratories using chemical abrasion-isotope dilution-thermal ionisation mass spectrometry (CA-ID-TIMS) is 48.106 ± 0.023 Ma (2s analytical including tracer uncertainties, MSWD = 1.53) and is our recommended date for GHR1 zircon. Microbeam 206Pb/238U dates from laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and secondary ion mass spectrometry (SIMS) laboratories are reproducible and in agreement with the CA-ID-TIMS date to within < 1.5%. Solution multi-collector ICP-MS (MC-ICP-MS) measurements of Hf isotopes from chemically purified aliquots of GHR1 yield a mean 176Hf/177Hf of 0.283050 ± 17 (2s, n = 10), corresponding to a εHf0 of +9.3. Hafnium isotopic measurements from two LA-ICP-MS laboratories are in agreement with the solution MC-ICP-MS value. The reproducibility of 206Pb/238U and 176Hf/177Hf ratios from GHR1 zircon across a variety of measurement techniques demonstrates their homogeneity in most grains. Additionally, the effectively limitless reserves of GHR1 material from an accessible exposure suggest that GHR1 can provide a useful reference material for U-Pb geochronology of Cenozoic zircon and Hf isotopic measurements of zircon with radiogenic 176Hf/177Hf.

AB - We present multitechnique U-Pb geochronology and Hf isotopic data from zircon separated from rapakivi biotite granite within the Eocene Golden Horn batholith in Washington, USA. A weighted mean of twenty-five Th-corrected 206Pb/238U zircon dates produced at two independent laboratories using chemical abrasion-isotope dilution-thermal ionisation mass spectrometry (CA-ID-TIMS) is 48.106 ± 0.023 Ma (2s analytical including tracer uncertainties, MSWD = 1.53) and is our recommended date for GHR1 zircon. Microbeam 206Pb/238U dates from laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and secondary ion mass spectrometry (SIMS) laboratories are reproducible and in agreement with the CA-ID-TIMS date to within < 1.5%. Solution multi-collector ICP-MS (MC-ICP-MS) measurements of Hf isotopes from chemically purified aliquots of GHR1 yield a mean 176Hf/177Hf of 0.283050 ± 17 (2s, n = 10), corresponding to a εHf0 of +9.3. Hafnium isotopic measurements from two LA-ICP-MS laboratories are in agreement with the solution MC-ICP-MS value. The reproducibility of 206Pb/238U and 176Hf/177Hf ratios from GHR1 zircon across a variety of measurement techniques demonstrates their homogeneity in most grains. Additionally, the effectively limitless reserves of GHR1 material from an accessible exposure suggest that GHR1 can provide a useful reference material for U-Pb geochronology of Cenozoic zircon and Hf isotopic measurements of zircon with radiogenic 176Hf/177Hf.

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KW - secondary ion mass spectrometry

KW - U-Pb geochronology

KW - zircon

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