Accurate Determination of Ni, Ca and Mn in Olivine by EPMA and LA-ICP-MS

• 责任者：Zheng Shu (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Hu Zhaochu
• 刊名：Earth Science
• 出版年：2009
• 卷期：34(1)
• 关键词：电子探针 ; electron probe ; 质谱法 ; mass spectrometry ; 橄榄石 ; olivine
• 页码：p.220-224
• 图表：5 illus., 3 tables, 16 refs.
• 分类号：0900
• issnNo：ISSN1000-2383
• isbnNo：CN42-1233/P

Phenocrystal olivines in mafic and ultramafic magmatic rocks are critical minerals for trace composition of primary mantle-derived magma and in turn to study composition and evolution of the mantle. The authors developed two methods for accurate determination of Ni, Ca, Mn and other elements in olivine by EPMA and LA ICP-MS. These elements are important indi cators for the basalt source composition. The limits of detection for these elements are within the range of 7 to 57 (10-6) by using the proposed EPMA analytical method, which are lower than those of the routine EPMA method by a factor of 3-18. The EPMA and LA-ICP-MS were then successfully applied to the determination of Mg, A1, Ca, Ti, Cr, Mn, Fe, Co and Ni in olivine phenocrysts from Early Cretaceous Feixian (western Shandong) and Sihetun (western Liaonin) basalts in the North China craton. Most of the determined values in the same samples determined by EPMA and LA-ICP-MS agree within 10%. It demonstrates the accuracy of the developed EPMA and LA-ICP-MS methods.