Geochronological review of Sambagawa metamorphic belt in Southwest Japan
Geochronological review of Sambagawa metamorphic belt in Southwest Japan作者机构：College of Earth Sciences Jilin University Changchun 130061 Jilin China Department of Geoscience Shimane University 1060 Nishikcavatsu Matsue 690-8504 Japan
出 版 物：《Journal of Geoscientific Research in Northeast Asia》 (东北亚地学研究（英文版）)
年 卷 期：2005年第8卷第1期
页 面：53-64页
学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学]
基 金：the research fellowship of Japan Society for the Promotion of Science (JSPS)
摘 要：Based on almost all available published age data, the protolith ages, peak metamorphic ages and cooling rate of the Sambagawa metamorphic belt have been discussed and the latest constraints on the ages of the Sambagawa metamorphism and subduction-related accretionary evolutions were summarized. Peak metamorphic conditions attained within the Kuma nappe complex at ca. 145～185 Ma, and uplift through ca. 500℃ at ca. 150 Ma and 350～400℃ at ca. 110～ 115 Ma. The protolith sediments of the Besshi nappe complex were accumulated and subsequently progressively subducted and suffered high P-T prograde metamorphism during the Kuma nappe complex uplifting. The Besshi nappe complex arrived maximum metamorphic conditions at ca. 110 ～ 120 Ma and subsequently started rapid uplift with the cooling rate of ca. 14.2℃/Ma at ca. 75 ～85 Ma, followed with the cooling rate of ca. 6.0 ～8.9℃/Ma. The Oboke nappe complex started subduction later than other tectonic units and arrived the peak metamorphic conditions at ca. 75 Ma, which followed by the uplift with a cooling rate of ca. 8℃/Ma.
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