微区原位普通铅同位素分析技术及其地质应用进展

Progress in In-Situ Common Pb Isotopic Analysis and Its Geological Applications

应用激光剥蚀—多接收器电感耦合等离子体质谱(LA-MC-ICP-MS)和二次离子质谱(SIMS)等分析技术进行微区原位普通Pb同位素分析是微区地球化学研究的重要内容之一。综述了矿物、熔体包裹体和沉积结核的微区原位普通Pb同位素分析技术及其地质应用的新进展。这些研究资料表明该分析技术在岩浆岩成因、沉积物物源示踪、地幔地球化学、古海洋学以及矿床学等的研究中提供了常规的全岩Pb同位素分析方法难以获得的重要信息,充分展示了该分析技术在地球科学研究中的应用前景。

Micro-probing in-situ analysis of common Pb isotope by methods of laser ablation multi-collector inductively coupled plasma mass spectrometry （LA-MC-ICP-MS） or secondary ion mass spectrometry （SIMS） is becoming one of the most important fields in microgeochemistry. This paper reviews in-situ common Pb isotope analytical advances in analysing silicate-, sulfide minerals, melt inclusions and marine sedimentary oxide nodules. These studies reveal that, compared with traditional whole-rock Pb isotopic analysis, the developing method displays greater potentials for further applications in geosciences, for it offers unique insight into the understanding of magmatic sources, sedimentary proveniences, mantle geochemistry, paleo-oceanography and ore deposits.