GSJ Open-file Report no.531

Contour maps of some useful petrological parameters on P-T plane: A case of the eruptive products of the Asama volcano on 1 September 2004

by Isoji MIAYGI (GSJ)


Some useful petrological parameters are summarized for bulk rock composition of the essential ejecta of Asama Volcano on 1 September 2004 (sample ID = pumice 1, Miyake et al., 2005).

The parameters include the amount and chemical compositions of minerals and melt in equilibrium at some P, T, fO2, and H2O concentrations. Using the MELTS program (Asimow and Ghiorso, 1998, Ghiorso and Sack, 1995), the petrological parameters were obtained over the range of pressure from 1 atmosphere to 16 k bar with 0.1 k bar step, temperature from 700 to 1400 C with 1 C step, oxygen fugacity FMQ, FMQ+1, FMQ+2 log unit, and water concentration 0.1, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0 4.5, 5.0, 6.0, 8.0, and 10 wt.% H2O (combination of P, T, H2O, and fO2 is about 4.7 million).

The obtained numerical values were summarized as a thousand of contour maps on pressure-temperature plane using the GMT program (Wessel and Smith, 1998) and the maps are htmlized and cross-linked.

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References:

An example of citation:

Miaygi (2010) Contour maps of some useful petrological parameters on P-T plane: A case of the eruptive products of the Asama volcano on 1 September 2004. Open File Report of GSJ, no.531, Geological Survey of Japan, AIST.


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