Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2011 Joint Annual Meeting of Japan Association of Mineralogical Sciences and The Geological Society of Japan
Session ID : T3-08
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T3: Evaluation of long-term activity and disaster measures of active volcanoes in East Japan
difference of temperature of caldera forming felsic magma
*Azusa KondoMasatsugu YamamotoTakeyuki OgataSatoshi ShibataTakahiro Kuzumaki
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CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract
Using the CL images and Ti concentrations of quartz, we estimate magma temperatures. (1)We compare the Obirakiyama tuff mainly contains two types of quartz bearing pumice clast (Bt-type and Hb-type; Kudo et al.,2007). CL images of Bt-type quartz crystals are almost uniform (710C). In contrast, Hb-type quartz crystals has darker core (750C) with brighter rim(800C). It is concluding that only Hb-type magma has recharged mafic magma its triggered eruption. (2)There is a across arc variation of the caldera forming felsic magma. Chijimisawa tuff (volcanic front region) has higher temperature (40-90C) than Obirakiyama tuff (back arc region).
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© 2011 Japan Association of Mineralogical Sciences
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