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Article

The Chemical State and Occupancy of Radiogenic Pb, and Crystallinity of RW-1 Monazite Revealed by XPS and TEM

by 1,2,3, 3,4,5,*, 6, 7, 1,2,3, 3,4, 3,4,5 and 1,2,3
1
Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2
Electron Microscope Laboratory, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3
Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China
4
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
5
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
6
Analytical and Testing Center of Chongqing University, Chongqing University, Chongqing 401331, China
7
State Key Lab of ASIC and system, School of Microelectronics, Fudan University, Shanghai 200433, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(6), 504; https://doi.org/10.3390/min10060504
Received: 30 April 2020 / Revised: 21 May 2020 / Accepted: 31 May 2020 / Published: 31 May 2020
(This article belongs to the Special Issue Crystallography and Mineralogy of Phosphates)
Monazite ((Ce, La, Nd, Th)PO4) is one of the widely used minerals for U–Th–Pb dating in geochronology. To better understand the possible effects of radiogenic Pb on the in situ dating method, a natural monazite U–Th–Pb standard sample (RW-1) was chemically and structurally characterized down to atomic scales by using the combination of Raman spectrum (RM), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The experimental results revealed that radiogenic Pb exists as Pb2+ and substitutes for the Ce site in the monazite crystal lattice. Moreover, TEM imaging demonstrated that monazite is well crystalline revealed by an atomic structure in most areas except for a few tiny defects, which are likely attributed to alpha self-healing from an electronic energy loss of α particles. The characterization of the chemical state and occupancy of radiogenic Pb, and the distribution of Pb and Th in monazite at the nanoscale and atomic scale could provide insight for us to understand the mechanisms of the nanogeochronology. View Full-Text
Keywords: monazite; radiogenic Pb; TEM; XPS; nano-geochronology monazite; radiogenic Pb; TEM; XPS; nano-geochronology
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MDPI and ACS Style

Tang, X.; Li, Q.-L.; Zhang, B.; Wang, P.; Gu, L.-X.; Ling, X.-X.; Fei, C.-H.; Li, J.-H. The Chemical State and Occupancy of Radiogenic Pb, and Crystallinity of RW-1 Monazite Revealed by XPS and TEM. Minerals 2020, 10, 504. https://doi.org/10.3390/min10060504

AMA Style

Tang X, Li Q-L, Zhang B, Wang P, Gu L-X, Ling X-X, Fei C-H, Li J-H. The Chemical State and Occupancy of Radiogenic Pb, and Crystallinity of RW-1 Monazite Revealed by XPS and TEM. Minerals. 2020; 10(6):504. https://doi.org/10.3390/min10060504

Chicago/Turabian Style

Tang, Xu, Qiu-Li Li, Bin Zhang, Peng Wang, Li-Xin Gu, Xiao-Xiao Ling, Chen-Hui Fei, and Jin-Hua Li. 2020. "The Chemical State and Occupancy of Radiogenic Pb, and Crystallinity of RW-1 Monazite Revealed by XPS and TEM" Minerals 10, no. 6: 504. https://doi.org/10.3390/min10060504

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