Solidification pressure and crystallization age of the ~5 Ma Shiaidani Granodiorite (Hida Mountain Range, central Japan) are determined based on Al-in-hornblende geobarometry and U–Pb zircon dating. Al-poor patchy replacements developed in amphiboles are common in this granite and petrographic study revealed that the replacements include chloritized biotite and albitic plagioclase. These are probably the hydrothermally recrystallized domains, and should not be used for solidification pressure estimates. Magmatic rim of amphibole is characterized by Si < 7.3 a.p.f.u. (Al_IV > 0.7 a.p.f.u.), and utilized in solidification pressure estimate that yielded 0.17–0.29 GPa. The solidification age of the granite is estimated as ~5.6–5.2 Ma using U–Pb zircon dating. From these data, the lower limit of an average denudation rate after ~5.6–5.2 Ma for the area where Shiaidani Granodiorite is exposed is estimated as 0.93–2.5 mm/year.

中文翻译：

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Shiaidani 花岗闪长岩的凝固深度和结晶年龄：对日本中部飞騨山脉平均剥蚀率的制约

约 5 Ma Shiaidani 花岗闪长岩（日本中部飞騨山脉）的凝固压力和结晶年龄是基于角闪石中的铝地质气压测量法和 U-Pb 锆石测年确定的。在这种花岗岩和岩相学研究中，角闪石中开发的贫铝斑块替代物很常见，表明替代物包括绿泥石化黑云母和白长石斜长石。这些可能是热液重结晶域，不应用于估计凝固压力。闪石岩浆边缘的特征是 Si < 7.3 apfu (Al _IV > 0.7 apfu)，并用于产生 0.17–0.29 GPa 的凝固压力估计。使用 U-Pb 锆石测年估计花岗岩的凝固年龄约为 5.6-5.2 Ma。根据这些数据，Shiaidani 花岗闪长岩暴露区域在~5.6-5.2 Ma 之后的平均剥蚀率下限估计为 0.93-2.5 毫米/年。