Characteristics of Fe-Ti oxide minerals in middle and late pleistocene marker-tephras of south Kanto, central Japan.

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  • 南関東における第四紀中・後期の示標テフラ層に含まれる鉄‐チタン酸化物の特性
  • ミナミ カントウ ニ オケル ダイ4キチュウ コウキ ノ シヒョウ テフラソウ

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This paper presents the following matters about the Fe-Ti oxide minerals contained in the 75 tephras, which are about 70% of marker-tephras sedimented on Oiso Hill, 25km east of Hakone Volcano.<br>Examination of the content, occurrence and type of Fe-Ti oxide minerals clarifies the following features:<br>1) There is a positive correlation between the refractive indices of orthopyroxenes and the TiO2 content of titanomagnetite.<br>2) In many cases, the TiO2 content of ferromagnetic minerals enable us to identify each tephra.<br>Then it is shown that the tephras, which can't be identified by similar TiO2 content, can be identified by the combination of the ratios of ferromagnetic minerals, Mn/Fe and V/Ti, V/Mn and Ti/Zn.<br>Moreover others, which can't be identified, can be distiuguished by the content of ferromagnetic minerals, that of β-phase, and the ratio of attached minerals.

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