R7: Petrology, Mineralogy and Economic geology (Joint Session with Society of Resource Geology)

[R7-02] Plausible candidates of the IOA-IOCG type magnetite ore deposits in the Kanto Mountains.

*Atsushi MIYASHITA¹, Hiroyasu MURAKAMI² (1. Seikei Univ., 2. Waseda Univ.)

Keywords:Magnetite, IOA-IOCG type, Skarn type

In the Kanto Mountains, some Neogene magnetite ore deposits have features such as (1) formed near the tectonic line; (2) accompanied by hydrothermal brecciation of host rocks; (3) with actinolite or chlorite and carbonate alteration; (4) with REE-rich minerals; (5) magnetites including chlorapatite inclusions; (6) high formation temperature above 500℃. These characteristics indicate that these magnetite ore deposits are the IOA-IOCG type candidates in Japan. These ore deposits are thought to have formed a metallogenic province with the Miocene to Pliocene granodiorite.