Analytical Conditions for U-Th-Pb Dating of Monazite by LA-ICP-MS

ZHANG Ya; LI Quan-zhong; YAN Jun; XIE Jian-cheng; YANG Qing-liang; GAO Ling

doi:10.15898/j.cnki.11-2131/td.202101130005

Rock and Mineral Analysis > 2021 > 40(5): 637-649. > DOI: 10.15898/j.cnki.11-2131/td.202101130005

ZHANG Ya, LI Quan-zhong, YAN Jun, XIE Jian-cheng, YANG Qing-liang, GAO Ling. Analytical Conditions for U-Th-Pb Dating of Monazite by LA-ICP-MS[J]. Rock and Mineral Analysis, 2021, 40(5): 637-649. DOI: 10.15898/j.cnki.11-2131/td.202101130005

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Analytical Conditions for U-Th-Pb Dating of Monazite by LA-ICP-MS

School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China

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Received Date: January 12, 2021
Revised Date: April 14, 2021
Accepted Date: August 27, 2021
Published Date: September 27, 2021

Abstract

HIGHLIGHTS
(1) According to the properties of monazite, the best dating conditions were explored from three aspects: laser frequency, beam spot diameter and dwelling time of ²³²Th.

(2) The optimum conditions were the laser spot diameter of 16μm, the frequency of 5Hz, and the ²³²Th dwelling time of 3ms or 1ms.

(3) The monazite age of Huangshan granite samples was consistent with the zircon age, which verified the dating conditions.

ABSTRACT

BACKGROUNDCompared with zircon U-Pb dating, monazite has more advantages in the dating of some metamorphic rocks or highly differentiated rocks. However, the U-Th-Pb isotopic dating of monazite has been limited, because of high Th concentration (commonly>7%), many mineral inclusions, and rare dating standard samples. Previous research on LA-ICP-MS U-Th-Pb dating of monazite mainly focused on laser parameters, and lacked attention on ICP-MS conditions.
OBJECTIVESTo find suitable experimental LA-ICP-MS monazite dating conditions.
METHODSUsing 193nm ArF excimer laser ablation system and Agilent 7500a inductively coupled plasma-mass spectrometer, laser parameters (laser beam spot diameter and laser frequency) and ICP-MS parameters(dwelling time of ²³²Th) were investigated. The laser beam spot diameter was set to 24μm, 16μm and 10μm, and the laser frequency was set to 3Hz, 4Hz and 5Hz. The dwelling time of ²³²Th was set to 10ms, 6ms, 3ms and 1ms for U-Th-Pb dating. Finally, the monazite sample RW-1 was used as the standard sample to calibrate the monazite sample Bananeira.
RESULTSIt was suitable for monazite dating when the beam spot diameter was 16μm, the dwelling time of ²³²Th was 3ms or 1ms, the energy density was 4J/cm², the laser frequency was 5Hz, the carrier gas (He) flow rate was 0.35L/min, and the carrier gas (Ar) flow rate was 0.95L/min. Under these conditions, Bananeira's weighted average ages of ²⁰⁷Pb/²³⁵U were 510.7±8.6Ma (MSWD=0.87), and 513.8±5.7Ma (MSWD=0.38), which were consistent with the recommended age of 507.7±1.3Ma with respective errors of 0.59% and 1.20%. ²⁰⁸Pb/²³²Th weighted average ages were 496.9±8.6Ma (MSWD=0.596) and 499.8±5.6Ma (MSWD=0.37), which were consistent with the recommended age of 497.6±1.6Ma, with respective errors of 0.14% and 0.44%. The ²⁰⁷Pb/²³⁵U weighted average age of Huangshan sample HS-1 was 128.3±2.4Ma (MSWD=0.73), which were close to the zircon age of 127.0±2.1Ma (MSWD=0.93) in the Huangshan area.
CONCLUSIONSThe optimal laser and ICP-MS conditions are suitable for monazite U-Th-Pb isotopic age determination.
- LA-ICP-MS,
- monazite U-Th-Pb isotopic dating,
- laser spot,
- dwelling time of ²³²Th

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References (38)

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