U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance

CHEN Yan; PAN Jia-yong; ZHONG Fu-jun; WAN Jian-jun; YAN Jie; LIU Wen-quan; LI Hai-dong

doi:10.15898/j.cnki.11-2131/td.202103120038

Rock and Mineral Analysis > 2022 > 41(1): 1-13. > DOI: 10.15898/j.cnki.11-2131/td.202103120038

CHEN Yan, PAN Jia-yong, ZHONG Fu-jun, WAN Jian-jun, YAN Jie, LIU Wen-quan, LI Hai-dong. U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance[J]. Rock and Mineral Analysis, 2022, 41(1): 1-13. DOI: 10.15898/j.cnki.11-2131/td.202103120038

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U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance

1.
State Key Laboratory of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China
2.
No. 290 Research Institute, China National Nuclear Corporation, Shaoguan 512026, China

More Information

Received Date: March 11, 2021
Revised Date: August 03, 2021
Accepted Date: September 20, 2021
Published Date: January 27, 2022

Abstract

HIGHLIGHTS
(1) LA-ICP-MS U-Pb dating of monazite from the Youdong pluton and Changjiang pluton yields ages of 228.0±1.5Ma and 156.8±1.7Ma, respectively.

(2) The Youdong pluton was formed in the Late Indosinian period, whereas the Changjiang pluton was formed by Early Yanshanian magmatism.

(3) Monazite U-Pb age can provide chronological evidence for high-uranium granite.

ABSTRACT

BACKGROUNDThe Changjiang uranium ore field in the southern margin of the Zhuguangshan complex pluton is a typical granite-type uranium ore field in China. Zircon U-Pb dating has been used to date ore-bearing granites. However, due to the high content of uranium in the whole rock and zircon mineral, some zircons tend to be decrystallized, which may lead to scattered zircon U-Pb data and may affect the reliability of zircon U-Pb dating. Monazite is a widespread accessory mineral in granite, and it is an ideal mineral for U-Pb dating due to its high U and Th contents (up to 10000×10^-6), and low common Pb content of about 100×10^-6-1000×10^-6.
OBJECTIVESIn order to constrain the age of the ore-bearing granite and discuss the tectonic setting.
METHODSLA-ICP-MS U-Pb dating method was used to constrain the formation age of monazite from the Youdong and Changjiang plutons. The monazite standard materials USGS44069 and Trebilcock were selected as external standard samples and monitoring standard samples, respectively.
RESULTSThe ²⁰⁶Pb/²³⁸U age of monazite in the Youdong pluton is 228.0±1.5Ma (MSWD=0.82, n=23), and that of monazite in the Changjiang pluton is 156.8±1.7Ma (MSWD=0.76, n=14). These ages are consistent with the SHRIMP zircon ages of 232±4Ma and 160±2Ma, respectively, which further confirms that the Youdong pluton is the product of Late Indosinian magmatism, and the Yangtze River pluton is the product of early Yanshanian magmatism.
CONCLUSIONSThis study demonstrates that the U-Pb age of monazite in high-uranium granites can effectively constrain their formation age.

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References (35)

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U-Pb Isotopic Dating of Monazite in Granite from the Changjiang Uranium Orefield, Northern Guangdong Province and Its Geological Significance

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