The Sasano copper deposit, Yoshioka mine, Japan, shows that an extensive skarn deposit can be formed from aluminous rocks by calcium (and iron) supplied from hydrothermal solutions. Skarn zoning in the deposit is: massive biotite hornfels-plagioclase-clinopyroxene skarn-hastingsite-clinopyroxene skarn with chalcopyrite-pyrrhotite ore. No limestone is associated with the deposit. The mineral assemblage and mineral compositions suggest that the chemical potentials of CaO and FeO increased toward the center of the deposit and were the predominant control on the formation of these skarns.

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