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

Date

2003

Authors

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

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

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. Its206Pb/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.

Description

Keywords

Keywords: dating method; geochronology; Phanerozoic; SHRIMP dating; standard (reference); zircon Dating standard; Geochronology; Ion probe; SHRIMP method; TEMORA 1; U-Pb; Zircon

Citation

Source

Chemical Geology

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1016/S0009-2541(03)00165-7

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