TEMORA 1: A new zircon standard for Phanerozoic U-Pb geochronology

Lance P. Black; Sandra L. Kamo; Charlotte M. Allen; John N. Aleinikoff; Donald W. Davis; Russell J. Korsch; Chris Foudoulis

doi:10.1016/S0009-2541(03)00165-7

TEMORA 1: A new zircon standard for Phanerozoic U-Pb geochronology

Lance P. Black^*, Sandra L. Kamo, Charlotte M. Allen, John N. Aleinikoff, Donald W. Davis, Russell J. Korsch, Chris Foudoulis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2307 Citations (Scopus)

Abstract

The role of the standard is critical to the derivation of reliable U-Pb zircon ages by micro-beam analysis. For maximum reliability, it is critically important that the utilised standard be homogeneous at all scales of analysis. It is equally important that the standard has been precisely and accurately dated by an independent technique. This study reports the emergence of a new zircon standard that meets those criteria, as demonstrated by Sensitive High Resolution Ion MicroProbe (SHRIMP), isotope dilution thermal ionisation mass-spectrometry (IDTIMS) and excimer laser ablation- inductively coupled plasma-mass-spectrometry (ELA-ICP-MS) documentation. The TEMORA 1 zircon standard derives from the Middledale Gabbroic Diorite, a high-level mafic stock within the Palaeozoic Lachlan Orogen of eastern Australia. Its ²⁰⁶Pb/²³⁸U IDTIMS age has been determined to be 416.75±0.24 Ma (95% confidence limits), based on measurement errors alone. Spike-calibration uncertainty limits the accuracy to 416.8±1.1 Ma for U-Pb intercomparisons between different laboratories that do not use a common spike.

Original language	English
Pages (from-to)	155-170
Number of pages	16
Journal	Chemical Geology
Volume	200
Issue number	1-2
DOIs	https://doi.org/10.1016/S0009-2541(03)00165-7
Publication status	Published - 16 Oct 2003

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title = "TEMORA 1: A new zircon standard for Phanerozoic U-Pb geochronology",

abstract = "The role of the standard is critical to the derivation of reliable U-Pb zircon ages by micro-beam analysis. For maximum reliability, it is critically important that the utilised standard be homogeneous at all scales of analysis. It is equally important that the standard has been precisely and accurately dated by an independent technique. This study reports the emergence of a new zircon standard that meets those criteria, as demonstrated by Sensitive High Resolution Ion MicroProbe (SHRIMP), isotope dilution thermal ionisation mass-spectrometry (IDTIMS) and excimer laser ablation- inductively coupled plasma-mass-spectrometry (ELA-ICP-MS) documentation. The TEMORA 1 zircon standard derives from the Middledale Gabbroic Diorite, a high-level mafic stock within the Palaeozoic Lachlan Orogen of eastern Australia. Its 206Pb/238U IDTIMS age has been determined to be 416.75±0.24 Ma (95% confidence limits), based on measurement errors alone. Spike-calibration uncertainty limits the accuracy to 416.8±1.1 Ma for U-Pb intercomparisons between different laboratories that do not use a common spike.",

keywords = "Dating standard, Geochronology, Ion probe, SHRIMP method, TEMORA 1, U-Pb, Zircon",

author = "Black, {Lance P.} and Kamo, {Sandra L.} and Allen, {Charlotte M.} and Aleinikoff, {John N.} and Davis, {Donald W.} and Korsch, {Russell J.} and Chris Foudoulis",

year = "2003",

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doi = "10.1016/S0009-2541(03)00165-7",

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T2 - A new zircon standard for Phanerozoic U-Pb geochronology

AU - Black, Lance P.

AU - Kamo, Sandra L.

AU - Allen, Charlotte M.

AU - Aleinikoff, John N.

AU - Davis, Donald W.

AU - Korsch, Russell J.

AU - Foudoulis, Chris

PY - 2003/10/16

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N2 - The role of the standard is critical to the derivation of reliable U-Pb zircon ages by micro-beam analysis. For maximum reliability, it is critically important that the utilised standard be homogeneous at all scales of analysis. It is equally important that the standard has been precisely and accurately dated by an independent technique. This study reports the emergence of a new zircon standard that meets those criteria, as demonstrated by Sensitive High Resolution Ion MicroProbe (SHRIMP), isotope dilution thermal ionisation mass-spectrometry (IDTIMS) and excimer laser ablation- inductively coupled plasma-mass-spectrometry (ELA-ICP-MS) documentation. The TEMORA 1 zircon standard derives from the Middledale Gabbroic Diorite, a high-level mafic stock within the Palaeozoic Lachlan Orogen of eastern Australia. Its 206Pb/238U IDTIMS age has been determined to be 416.75±0.24 Ma (95% confidence limits), based on measurement errors alone. Spike-calibration uncertainty limits the accuracy to 416.8±1.1 Ma for U-Pb intercomparisons between different laboratories that do not use a common spike.

AB - The role of the standard is critical to the derivation of reliable U-Pb zircon ages by micro-beam analysis. For maximum reliability, it is critically important that the utilised standard be homogeneous at all scales of analysis. It is equally important that the standard has been precisely and accurately dated by an independent technique. This study reports the emergence of a new zircon standard that meets those criteria, as demonstrated by Sensitive High Resolution Ion MicroProbe (SHRIMP), isotope dilution thermal ionisation mass-spectrometry (IDTIMS) and excimer laser ablation- inductively coupled plasma-mass-spectrometry (ELA-ICP-MS) documentation. The TEMORA 1 zircon standard derives from the Middledale Gabbroic Diorite, a high-level mafic stock within the Palaeozoic Lachlan Orogen of eastern Australia. Its 206Pb/238U IDTIMS age has been determined to be 416.75±0.24 Ma (95% confidence limits), based on measurement errors alone. Spike-calibration uncertainty limits the accuracy to 416.8±1.1 Ma for U-Pb intercomparisons between different laboratories that do not use a common spike.

KW - Dating standard

KW - Geochronology

KW - Ion probe

KW - SHRIMP method

KW - TEMORA 1

KW - U-Pb

KW - Zircon

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DO - 10.1016/S0009-2541(03)00165-7

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EP - 170

JO - Chemical Geology

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IS - 1-2

ER -

TEMORA 1: A new zircon standard for Phanerozoic U-Pb geochronology

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