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In situ U-Pb dating of xenotime by laser ablation(LA)-ICP-MS

In situ U-Pb dating of xenotime by laser ablation(LA)-ICP-MS

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： liu zhichao~(1,2),wu fuyuan~(1*),guo chunli~3.zhao zifu~4,{3. jinhui~1 & sun jinfeng~(1,2) 1 state key Laboratory of litho spheric evolution,institute of geology and geophysics,{13.,beijing 100029,china 2 Graduate University of {13.,beijing 100049,china 3.institute of Mineral Deposits,chinese academy of Geological sciences,beijing 10003.,china 4 School of Earth and Space sciences,University of Science and Technology of china,Hefei 23.026,china

Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents,but typically low concentration of common *** characteristics,and the fact that it is widespread throughout various types of rocks,suggest that the U-Th-Pb dating of xenotime has broad *** of U-Pb dating on xenotime by ion microprobe(such as SHPJMP) have increased in recent years,whereas studies by laser ablation(LA)-ICP-MS are still *** this study,we developed a technique for U-Pb dating of xenotime using the 193.nm ArF laser-ablation system and Agilent 7500a *** evaluate the reliability of our method,a xenotime standard,BS-1,was analyzed and calibrated against another xenotime standard,*** weighted mean Pb/U ages of 510.1±5.2 Ma(2a,n = 21),509.8±4.3.Ma(2 a,n = 21) and 510.0±4.6 Ma(2a,n = 21) were obtained using beam diameters of 16,24 and 3.μm,*** ages are identical to those determined by ID-TTMS method(weighted mean Pb/U age of 508.8±1.4 Ma),which supports the reliability of our LA-ICP-MS *** also analyzed xenotimes in leucogranites from South Tibet and granites from Xihuashan in southern china,and obtained accurate and precise ***,we observed systematic differences in Pb/U fractionation among xenotime,monazite and *** matrix-effect resulted in either under-correction or over-correction of fractionation,and thus led to inaccurate ***,a matrix -matched material is required for U-Pb dating of xenotime by LA-ICP-MS.

关键词： xenotime laser ablation(LA)-ICP-MS U-Pb dating

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