Melting experiments on a high-magnesian andesite |
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| Authors: | Yoshiyuki Tatsumi |
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| Institution: | Earthquake Research Institute, University of Tokyo, Tokyo 113Japan |
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| Abstract: | Melting experiments were conducted on a high-magnesian bronzite olivine andesite (Teraga-Ike andesite) which is considered to be a primary andesite. The high-magnesian andesite magma is in equilibrium with both olivine and orthopyroxene at about 15.5 kbar and 1080°C under H2O-saturated conditions and at lower pressure and higher temperature under H2O-undersaturated conditions. This suggests that high-magnesian andesites could be generated by the partial melting of upper mantle peridotite containing a small amount of H2O. |
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