Solidification depth and crystallization age of the Kurobe-bessan granite: constraints to the average denudation rate of the Hida Range, central Japan
Solidification depth and crystallization age of the Kurobe-bessan granite: constraints to the average denudation rate of the Hida Range, central Japan
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黑部别山花岗岩的凝固深度和结晶年龄：日本中部飞驒山脉平均剥蚀率的制约因素
DOI：
10.1111/iar.12414
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发表时间：
2021
期刊：
影响因子：
1.5
通讯作者：
Takahiro TAGAMI
中科院分区：
文献类型：
--
作者：
Tetsuo KAWAKAMI1;Shigeru SUEOKA;Tatsunori YOKOYAMA;Saya KAGAMI;Georgina E. King;Frederic Herman;Sumiko Tsukamoto;Takahiro TAGAMI
利用角闪铝石地质容量法和锆石U-Pb法测定了日本中部平田山~5 Ma Shiaidani花岗闪长岩的凝固压力和结晶年龄。角闪岩中发育的贫铝斑片状交代物在该花岗岩中较为常见，岩相学研究表明，交替物包括氯化黑云母和钠长斜长石。这些可能是水热重结晶区域，不应用于凝固压力估算。角闪石的岩浆边缘具有Si <； 7.3a.p.f.u的特征。(Aliv>； 0.7a.p.f.u)，并用于凝固压力估算，得出0.17-0.29 GPA。用锆石U-Pb法测得该花岗岩的凝固年龄为5.6~5.2 Ma。根据这些资料，估计出露什艾达尼花岗闪长岩地区在~5.6~5.2 Ma后的平均剥蚀速率下限为0.93~2.5 mm/a。
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. (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 ~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.