5:15 PM - 6:45 PM
[PPS08-P20] Analysis of Allende matrix by FIB-TOF-SIMS/SNMS
Keywords:Novel analysis method, SIMS, Allende, Matrix
The Allende meteorite is one of the representative carbonaceous chondrites. It consists of organizations such as CAI, Chondrule, and Matrix, but Matrix has received less attention. The matrix is an aggregate of various minerals, and in the case of the Allende meteorite, it has been strongly affected by metamorphism, and the main component, olivine, is likely to have lost its primordial information. Therefore, the matrix formation model is extremely complex, and it is difficult to understand the agglomeration process and the degree of metamorphism. In order to correctly understand the matrix formation model, it is important to perform comprehensive analysis at various scales, including isotope analysis.
We used an independently developed focused ion beam time-of-flight secondary ion mass spectrometer (FIB-TOF-SIMS) to analyze the matrix region and We revealed the existence of Al-rich particles (Al-rich) with a size of several 100 nm between the particles. FIB-TOF-SIMS has extremely high surface resolution (up to 40 nm) and can image all elements simultaneously. In addition, FIB allows on-site cross-section processing of mineral particles, and analysis of the inside of the particles is also possible. Furthermore, by combining it with laser resonance ionization, precise isotope ratio analysis is also possible. In this presentation, we will introduce the FIB-TOF-SIMS device and its application to matrix analysis. Furthermore, we will introduce the matrix aggregation process assumed from FIB-TOF-SIMS analysis.
We used an independently developed focused ion beam time-of-flight secondary ion mass spectrometer (FIB-TOF-SIMS) to analyze the matrix region and We revealed the existence of Al-rich particles (Al-rich) with a size of several 100 nm between the particles. FIB-TOF-SIMS has extremely high surface resolution (up to 40 nm) and can image all elements simultaneously. In addition, FIB allows on-site cross-section processing of mineral particles, and analysis of the inside of the particles is also possible. Furthermore, by combining it with laser resonance ionization, precise isotope ratio analysis is also possible. In this presentation, we will introduce the FIB-TOF-SIMS device and its application to matrix analysis. Furthermore, we will introduce the matrix aggregation process assumed from FIB-TOF-SIMS analysis.