Direct Calibration Method for LA-HR-ICP-MS Apatite U-Pb Dating

ZHAO Linghao; ZHAN Xiuchun; ZENG Lingsen; HU Mingyue; SUN Dongyang; YUAN Jihai

doi:10.15898/j.cnki.11-2131/td.202202260035

Rock and Mineral Analysis > 2022 > 41(5): 744-753. > DOI: 10.15898/j.cnki.11-2131/td.202202260035

ZHAO Linghao, ZHAN Xiuchun, ZENG Lingsen, HU Mingyue, SUN Dongyang, YUAN Jihai. Direct Calibration Method for LA-HR-ICP-MS Apatite U-Pb Dating[J]. Rock and Mineral Analysis, 2022, 41(5): 744-753. DOI: 10.15898/j.cnki.11-2131/td.202202260035

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Direct Calibration Method for LA-HR-ICP-MS Apatite U-Pb Dating

1.
Key Laboratory of in-situ Elemental Micro-probe and Speciation Analysis, China Geological Survey; National Research Center for Geoanalysis, Beijing 100037, China
2.
Key Laboratory of Deep-Earth Dynamics, Ministry of Natural Resources; Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

More Information

Received Date: February 25, 2022
Revised Date: April 22, 2022
Accepted Date: April 29, 2022
Available Online: November 10, 2022

Abstract

HIGHLIGHTS
(1) Madagascar apatite sample MAD2 shows stable U-Pb isotope ratios, which can be used to calibrate apatite U-Pb isotope ratio measured by LA-ICP-MS directly, without common-Pb correction.

(2) Taking MAD2 as a reference mineral, combined with²⁰⁷Pb-correction method, the ages of apatite samples from McClure Mountain, Tory-Hill-apt and Durango were determined accurately.

(3) The calibration and data processing scheme based on MAD2 meets the accuracy requirements of apatite LA-ICP-MS U-Pb dating, while effectively reducing the difficulty of data processing.

ABSTRACT

BACKGROUND
Apatite is a common U-bearing accessory mineral with a U-Pb closure temperature of ~500℃, making U-Pb dating of apatite a potentially valuable thermochronometer. However, its low U concentration, high common lead concentration and lack of reference material has limited widespread application to LA-ICP-MS dating.
OBJECTIVES
To develop a technique for U-Pb dating of apatite using laser ablation sector field inductively coupled plasma-mass spectrometry (LA-HR-ICP-MS).
METHODS
The U-Pb isotope ratio in apatite samples was determined by LA-HR-ICP-MS, with apatite MAD2 as the external standard to correct U-Pb and Pb-Pb elemental fractionation directly without a common Pb correction.
RESULTS
Long-term U-Pb analysis of Madagascar apatite sample (MAD2) showed homogeneous distribution of U, Pb and U-Pb isotope ratios, with average contents of U and Pb ~23.8×10^-6 and ~13.5×10^-6, respectively and weighted average ²⁰⁷Pb/²⁰⁶Pb and ²⁰⁶Pb/²³⁸U ratios of 0.0941±0.0006 and 0.0794±0.0004, respectively. Taking MAD2 apatite as a reference mineral, combined with ²⁰⁷Pb-correction method, the ages of apatite samples, McClure Mountain (521±5Ma), Tory-Hill-apt (1021±16Ma), a Durango (30.7±1.5Ma) and Fagnshan diorite apatite (~131Ma) can be determined accurately.
CONCLUSIONS
The Madagascar apatite sample (MAD2) can be used to calibrate apatite U-Pb isotope ratio measured by LA-ICP-MS directly, without common-Pb correction, similar to the calibration strategy in zircon U-Pb dating. The method greatly reduces the difficulty of data processing during apatite U-Pb dating by LA-ICP-MS, which is conducive to the wide application of the method.
- apatite,
- U-Pb dating,
- LA-ICP-MS,
- reference material,
- Madagascar apatite (MAD2)

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References (40)

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