同位体組織学

SIMSが拓く宇宙・地球化学のフロンティア

抄録

Petrography or observation of petrographic texture is one of the most basic techniques for microanalysis of natural samples. Secondary ion mass spectrometry (SIMS) has been applied to isotope and trace element analyses in micron-size minerals in various natural samples evaluated by conventional petrography, e.g., search for the oldest rock, mineral and life, and for presolar grains. However, elemental texture and isotopic texture often indicate a different evidence of origin and evolution of the sample. In this paper, we reviewed SIMS history in cosmo-and geo-chemistry from a viewpoint from point-analysis to area-analysis. Here we propose that promotion of isotopic texture research, isotopography, is an important future trend of cosmo-and geo-chemistry. We also propose that further diffusion study in minerals under various Pressure-Temperature conditions is necessary. The analysis of isotopography by diffusion gives a quantitative scale of geospeedmetry of natural samples.