Japan Geoscience Union Meeting 2014

Presentation information

Poster

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG61_2PO1] Petrology, Mineralogy and Resource Geology

Fri. May 2, 2014 4:15 PM - 5:30 PM Poster (3F)

Convener:*Tsunogae Toshiaki(Faculty of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba), Koichiro Fujinaga(Department of Systems Innovation, School of Engineering, University of Tokyo), Akira Miyake Akira(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Nobutaka Tsuchiya(Department of Geology, Faculty of Education, Iwate University)

4:15 PM - 5:30 PM

[SCG61-P16] SEM-EDS Automated Particle Analysis of Mineral Compositions of Rocks

*Hitomi MUTOU1, Aiko SHIMADA2, Hiroshi ONODERA3 (1.JEOL Ltd.SM APPLICATION DEPARTMENT SM BUSINESS UNIT, 2.JEOL RESONANCE Inc. SM APPLICATION DEPARTMENT, 3.JEOL Ltd.SA APPLICATION DEPARTMENT SA BUSINESS UNIT)

Keywords:Mineral, Particles Analysis, SEM-EDS

Rocks consist of various kinds of minerals depending on their localities and formation processes. Mineral compositions of rocks are very important to study their sources and formation processes. X-ray fluorescence analysis (XRF) is commonly needed for mineral composition analysis. The XRF analysis provides the average composition of elements in a rock. Analysis of mineral particles in a rock is sometimes more important to find features of a rock. However, the analysis of a large number of mineral particles in a rock one by one requires a great deal of time. In recent years, the automated particle analysis combined with a scanning electron microscope (SEM) on energy dispersive X-ray spectrometer (EDS), which is called SEM-EDS automated particle analysis has rapidly been advancing. This method enables fast analysis of a large number of particles one by one directly.In this report, analysis of the mineral compositions of two rocks -the Koujaku granite and the Hakkoda second-stage pyroclastic flow deposition (Ht2) - was carried out with SEM (JSM-IT300LA, JEOL)-EDS (JED2300, JEOL) automated particle analysis. The samples for this analysis were prepared as follows: rocks were crushed separately and each crushed rock embedded in resin was polished. More than a few thousand particles of the rocks were analyzed. In the Koujaku granite, quartz was a dominant constituent. K-feldspar and alkali feldspar were contained in a higher concentration than plagioclase. In addition, some colored minerals were contained. In the Ht2, pumice was a dominant constituent. In addition, quartz, feldspar and some colored minerals were contained. Additionally, many particles in the Ht2 consisted of multiple minerals unlike in the Koujaku granite. In the presentation, we will give more detailed descriptions of minerals and their components of the rocks.