Cu-Zn-bearing veinlets and dolerite dikes traversing Pb-Zn-bearing skarn formed from impure Mn-bearing Miocene limestone. The limestone bed is sandwiched between propylitized Miocene pyroclastics and andesitic or rhyolitic breccia. The skarn body itself was worked as Pb-Zn ore; the younger dolerite dikes as rich Cu-Zn ore.
References
- Geology and Mineral Resources of Japan, pp. 163, 182-183 (Geological Survey of Japan, 1960).
- Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan.
- Yokoro, Y. and Nakashima, K. (2010): Ag-Cu-Pb-Bi-S Minerals Newly Discovered from the Ohori Base Metal Deposit, Yamagata Prefecture, NE Japan: Implications for Bi-metallogenesis in the Green-Tuff Region. Resource Geology, 60, 1-17.
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