Thermodynamic dataset of Sakurajima key basalt and andesite
This database provides thermodynamic calculation results
for the key magmas of Sakurajima Volcano.
A series of thermodynamic data has been obtained using the
Rhyolite-MELTS software on the magma compositions of
key basalt and andesite of Sakurajima volcano
(B_EastBay
and A_1976_0525 with
SiO2 47 and 59 wt. %
and with
K2O 0.5 and 1.5 wt. %,
respectively).
The results are visualized as contour diagrams plotted on
temperature–pressure planes comprising 44,415 PNG images.
These diagrams are interlinked via hypertext, and the
associated numerical data are organized in an SQLite3
database, with guidance on extracting relevant
information.
The parameters include the amount and chemical
compositions of minerals and melt in equilibrium at some
P, T, fO2, and H2O concentrations.
These parameters were obtained using the Rhyolite-MELTS (v
1.1.0) program (Gualda et al., 2012; Asimow and Ghiorso,
1998; Ghiorso and Sack, 1995) over the range of pressure
from 1 atmosphere to 860 MPa with 1-10 MPa step,
temperature from 700 to 1400 deg-C with 1 deg-C step,
oxygen fugacity FMQ+1 log unit, water concentration 0.0,
0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0; 2.2,
2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, 4.0, 4.2, 4.4,
4.6, 4.8, 5.0, 5.2, 5.4, 5.6, 5.8, 6.0, 6.2, 6.4, 6.6,
6.8, 7.0, 7.2, 7.4, 7.6, 7.8, 8.0 wt.% H2O,
and CO2 0.001, 0.01, 0.1, and 1 wt.%.
Since the Rhyolite-MELTS program outputs huge quantities of
numerical values, I summarized them into a suite of contour
maps on a pressure-temperature plane using the GMT program
(Wessel and Smith, 1998) and utilized them cross-linked to
develop a convenient tool.
In addition, you can extract numerical data from the plot
using the sqlite3 command, following the
Command Tips on the graph pages.
Figure 1.
K2O - SiO2
variation diagram of the eruptive products of Sakurajima volcano.
B:
whole-rock chemical composition of primitive basalt from
the eastern Kagoshima bay (Yamaguchi, 1975).
A:
whole-rock chemical composition of mafic end-member
andesitic volcanic ejecta of 25 May 1976 (Aramaki,
1980).
Red open circles (Melt):
interstitial glass of matrix and melt inclusions in
phenocrysts (Miyagi et al., 2010, 2013; Miyagi
unpublished data).
Black open circles (WR):
whole-rock chemical composition (Yamaguchi, 1975;
Aramaki, 1975, 1977, 1980;
Fukuyama and Ono, 1981;
Aramaki and Masui, 1982;
Aramaki and Kobayashi, 1986, 1988;
Kobayashi and Aramaki, 1989;
Yanagi+1991
Fujii and Kobayashi, 1995;
Miki et al., 2003).
Purple dots (Xtal):
chemical composition of phenocrysts and micro-phenocryst.
Starting material of the MELTS computations
| No. | SiO2 | TiO2 | Al2O3 | tFeO | MnO | MgO | CaO | Na2O | K2O | P2O5 | S | Cl | F | Total | what | Comment |
| B_EastBay | 47.05 | 0.78 | 20.09 | 10.26 | 0.07 | 5.66 | 13.2 | 1.98 | 0.48 | 0.11 | 0 | 0 | 0 | 99.68 | No.092 Yamaguchi_1975 | WR, Basalt of the eastern Kagoshima bay |
| A_1976_0525 | 59 | 0.78 | 16.6 | 6.84 | 0.15 | 3.11 | 7.93 | 3.16 | 1.48 | 0.19 | 0 | 0 | 0 | 99.24 | 008 Aramaki_1980 | WR, 25 May 1976 volcanic ejecta |
WR: Whole-rock chemical composition
Pfd: Pyroclastic flow deposit.
An example of citation:
Miyagi (2025)
Thermodynamic dataset of Sakurajima key basalt and andesite
https://doi.org/10.57765/2003426
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Version history:
- January 2026: Initial release
If you have questions about this page, contact
Isoji MIYAGI
