Mineral classification from quantitative X-ray maps using neural network; application to volcanic rocks

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doi: 10.1111/j.1440-1738.2009.00682.x
Author(s): Tsuji, Takeshi; Yamaguchi, Haruka; Ishii, Teruaki; Matsuoka, Toshifumi
Author Affiliation(s): Primary:
Kyoto University, Department of Civil and Earth Resources Engineering, Kyoto, Japan
Okayama University, Japan
Japan Agency for Marine-Earth Science and Technology, Japan
Volume Title: Island Arc
Source: Island Arc, 19(1), p.105-119. Publisher: Wiley Blackwell on behalf of Geological Society of Japan, Tsukuba, Japan. ISSN: 1038-4871
Note: In English. 24 refs.; illus., incl. 3 plates, 2 tables, sketch map
Summary: We developed a mineral classification technique of electron probe microanalyzer (EPMA) maps in order to reveal the mineral textures and compositions of volcanic rocks. In the case of lithologies such as basalt that include several kinds of minerals, X-ray intensities of several elements derived from EPMA must be considered simultaneously to determine the mineral map. In this research, we used a Kohonen self-organizing map (SOM) to classify minerals in the thin-sections from several X-ray intensity maps. The SOM is a type of artificial neural network that is trained using unsupervised training to produce a two-dimensional representation of multi-dimensional input data. The classified mineral maps of in situ oceanic basalts of the Juan de Fuca Plate allowed us to quantify mineralogical and textural differences among the marginal and central parts of the pillow basalts and the massive flow basalt. One advantage of mineral classification using a SOM is that relatively many minerals can be estimated from limited input elements. By applying our method to altered basalt which contains multiple minerals, we successfully classify eight minerals in thin-section. Abstract Copyright (2010), Blackwell Publishing Asia Pty Ltd.
Year of Publication: 2010
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 01 Mineralogy and Crystallography; 05 Petrology, Igneous and Metamorphic; Applications; Basalts; Chain silicates; Chemical composition; Classification; Clay minerals; Clinopyroxene; East Pacific; Electron probe data; Endeavour Ridge; Expedition 301; Feldspar group; Framework silicates; Glasses; IODP Site U1301; Igneous rocks; Integrated Ocean Drilling Program; Juan de Fuca Ridge; Lava; Magnetite; Major elements; Mapping; Mineral composition; Neural networks; North Pacific; Northeast Pacific; Oxides; Pacific Ocean; Pillow lava; Plagioclase; Porosity; Pyroxene group; Quantitative analysis; Self-organization; Sheet silicates; Silicates; Thin sections; Volcanic glass; Volcanic rocks; X-ray data
Coordinates: N474500 N474600 W1274600 W1274600
Record ID: 2012093210
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