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

[R7P-05] Silver, lead, zinc, manganese mineralization at the Shirakomori deposit, Akita Prefecture, Japan

*Shoma Yamada¹, yasushi Watanabe¹ (1. Akita Univ. Int)

Keywords:rhodochrosite, hydrothermal deposit, granodiorite

There are many hydrothermal metal deposits in the Taiheizan area located in the central part of Akita Prefecture. The Shirakomori deposit is a vein-type deposit of silver, lead, zinc, and manganese, and is hosted in the Taheiyama granitoids of Cretaceous age.
The objective of this study is to elucidate the formation process of the deposit.
Based on naked eye and microscopic observations, three phases of formation of the deposit were recognized.
The K-Ar dating of sericite associated with the vein is 3.43Ma, indicating that the deposit was formed in the Pliocene age.