TEMORA 1: a new zircon standard for Phanerozoic U-Pb geochronology
TEMORA 1: a new zircon standard for Phanerozoic U-Pb geochronology
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DOI：
10.1016/s0009-2541(03)00165-7
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发表时间：
2003-10-16
期刊：
影响因子：
3.9
通讯作者：
Foudoulis, C
中科院分区：
文献类型：
--
作者：
Black, LP;Kamo, SL;Foudoulis, C
该标准的作用对于微束分析获得可靠的锆石U-Pb年龄至关重要。为了最大限度地提高可靠性，至关重要的是，所用标准品在所有分析尺度下均质。同样重要的是，该标准已经通过独立的技术精确和准确地确定了日期。这项研究报告了一种新的锆石标准，满足这些标准，如证明了灵敏的高分辨率离子微探针（SHRIMP），同位素稀释热电离质谱（IDTIMS）和准分子激光烧蚀电感耦合等离子体质谱（ELA-ICP-MS）的文件。TEMORA 1锆石标准来自澳大利亚东部古生代拉克伦造山带内的一个高级镁铁质岩株--Middledale辉长闪长岩。其Pb-206/U-238 IDTIMS年龄已确定为416.75 +/- 0.24 Ma（95%置信限），仅基于测量误差。尖峰校准的不确定性限制的准确度为416.8 +/- 1.1 Ma的U-Pb相互比较不同的实验室，不使用一个共同的尖峰。皇冠版权所有（C）2003年出版的爱思唯尔科学B. V.保留所有权利。
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-massspectrometry (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 Pb-206/U-238 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. Crown Copyright (C) 2003 Published by Elsevier Science B.V. All rights reserved.