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Solidification depth and crystallization age of the Shiaidani Granodiorite; Constraints to the average denudation rate of the Hida Range, central Japan

志合谷花崗閃緑岩の固結深度と晶出温度; 中部日本飛騨山脈の平均削剥速度の制約

河上 哲生*; 末岡 茂  ; 横山 立憲  ; 鏡味 沙耶  ; King, G. E.*; Herman, F.*; 塚本 すみ子*; 田上 高広*

Kawakami, Tetsuo*; Sueoka, Shigeru; Yokoyama, Tatsunori; Kagami, Saya; King, G. E.*; Herman, F.*; Tsukamoto, Sumiko*; Tagami, Takahiro*

Solidification pressure and crystallization age of the ca 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. (AlIV > 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 ca 5.6-5.2 Ma using U-Pb zircon dating. From these data, the lower limit of an average denudation rate after ca 5.6-5.2 Ma for the area where Shiaidani Granodiorite is exposed is estimated as 0.93-2.5 mm/year.

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