Methodology for in situ wolframite U-Pb dating and its application
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thodology for in situ wolframite U-Pb dating and its application 1,2,3*
Yueheng YANG 1
1,2,3
, Ming YANG
, Hao WANG
1,2,3
, Jinhui YANG
1,2,3
1,2,3
& Fuyuan WU
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2 Innovation Academy of Earth Science, Chinese Academy of Sciences, Beijing 100029, China; 3 College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China Received April 23, 2020; revised August 7, 2020; accepted September 2, 2020; published online October 16, 2020
Citation:
Yang Y, Yang M, Wang H, Yang J, Wu F. 2020. Methodology for in situ wolframite U-Pb dating and its application. Science China Earth Sciences, 63, https://doi.org/10.1007/s11430-020-9676-3
Tungsten (or wolfram, W), one of the crucial metal sources, is widely used in electronics, oil, chemical and military industries. China owns abundant tungsten resources (~60% of the world reserves and ~80% of the world’s production), of which the area from Southern Jiangxi-Northern GuangdongSouthern Hunan is the most significant ore belt in south China. Understanding ore genesis and distribution as well as the process of fine mineralization will further benefit the prospecting and exploration of tungsten deposits. The accurate determination of the age of mineralization is at the front line in the study of ore deposit and the premise for solving and understanding the above problems. Tungsten is associated with tin ore and granitic rocks, hence, zircon in granite and the gauge minerals (e.g., mica, feldspar) or the associated molybdenite are usually used to indirectly date and define the time of tungsten mineralization. However, the physical and chemical conditions of tungsten enrichment and ore-forming processes are significantly different from the rock-forming elements and Molybdenum (Mo) and other metals in silicate. Therefore, the obtained age data might not be able to effectively restrict the time of tungsten mineralization. Wolframite [(Fe, Mn)WO4] is the main ore mineral for tungsten, and also the main ore used to refine tungsten. If the age of ore mineral (wolframite) can be dated and measured in situ, we could get a more reliable age of tungsten mineralization. Previous studies in the early 1980s showed that wolframite
* Corresponding author (email: [email protected])
usually contains a certain amount of U, suggesting that the mineral could be a good candidate for U-Pb dating. However, a conventional methodology for wolframite U-Pb dating has not yet been established. Romer and Lüders, (2006) from the Potsdam Centre for Geoscience Research (GFZ) in Germany, successfully dated wolframite from the Sweet Home Mine (Colorado, USA) by U-Pb isotope dilution 206 thermal ionization mass spectrometry (ID-TIMS). The Pb/ 238
U ID-TMS age from the Sweet Home Mine wolframite crystal was 25.7±0.3 Ma (Romer and Lüders, 2006). Later, the same group conducted several ID-TIMS U-Pb dating on wolframite samples f
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