Iron species in plagioclase:

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Presentation transcript:

Iron species in plagioclase: 20 / Aug. / ‘19 Iron species in plagioclase: Towards the understanding on magnetite exsolution in plagioclase 200 μm R. Nakada1), M. Sato2,3), M. Ushioda3), Y. Tamura4), S. Yamamoto4) 1 JAMSTEC, 2 Univ. of Tokyo, 3 AIST, 4 Yokohama National Univ.

It is very important to understand the exsolution mechanism Introduction 200 μm What is the magnetite exsolution? ・ observed in silicate minerals in plutonic rocks ・ grain size < several μm ・ protected from weathering by matrix mineral ・ possible source of magnetic anomaly It is very important to understand the exsolution mechanism

examine the Fe species in plagioclase Purpose Microscopic observation Speciation analysis examine the Fe species in plagioclase understand the crystallization mechanisms of magnetite exsolution Magnetic measurements Composition analysis

Conclusions ・ Valence state of Fe in plagioclase varies among crystals separated from the same plutonic rock ・ Two different sites are confirmed as a host of Fe in plagioclase from the same rock ・ The valence state of Fe and its distribution in plagioclase may be an important factor in the exsolution mechanism