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An improved U-Pb age dating method for detrital zircon by LA-MC-ICP-MS

Le Zhang, Zhong-Yuan Ren, Xiao-Ping Xia, Ce Wang, Sheng-Ping Qian
Geochemical Journal, Vol. 52, No. 5, P. 433-439, 2018

ABSTRACT

Detrital zircon U-Pb dating is a powerful tool to trace sources for sedimentary basin and to understand of geological history in structurally complex areas. This study established an analytical protocol for measurement of detrital zircon U-Pb age by LA-MC-ICP-MS. Because detrital zircons normally have a large Pb content variation (several ppm to hundred ppm), which leads to large variations for Pb signal intensity, two sets of detector arrays were used. For Pb-rich zircons, 206Pb was collected with Faraday cup detector array, while for Pb-poor zircons, 206Pb was collected with ion counter detector array. The results of 206Pb/238U age and 207Pb/235U age for six well-known and widely used zircon standards agree within 0.5% and 1% respectively of the preferred values measured by ID-TIMS. The precision of 206Pb/238U age and 207Pb/235U age of the six zircons vary from 0.6% to 2.3% and 0.9% to 2.3% (2SD), respectively.

KEYWORDS

detrital zircon, laser ablation, MC-ICP-MS, U-Pb age, 206Pb/238U

Supplementary Materials(file)

https://www.jstage.jst.go.jp/article/geochemj/52/5/52_2.0529/_supplement/_download/52_2.0529_1.pdf

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