Systematization of formation tectonics of high-temperature metamorphic rock based on their P-T path

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05346
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: University of the Ryukyus
• Principal Investigator: BABA Sotaro 琉球大学, 教育学部, 教授 (10347122)
• Co-Investigator(Renkei-kenkyūsha): HOKADA Tomokazu 国立極地研究所, 研究教育系地圏研究グループ, 准教授 (60370095) ; OSANAI Yasuhito 九州大学比較社会文化研究院, 教授 (80183771)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 高温変成岩 / 温度圧力経路

Outline of Final Research Achievements

We have examined the age of the metamorphism, and the tectonic setting of mafic rock protoliths based on whole rock chemical composition, for the metamorphic rocks constituting inland nunataks and coastal exposure of the central Droning Maud Land (CDML) in the East Antarctic. Combined the results of the metamorphic ages and the tectonic setting for metamorphic precursory rocks, metamorphic rocks with an isobaric cooling P-T path are due to heating just below in the back arc basin, and the metamorphic rocks showing an isothermal decompression P-T path are similar to the current accretionary prism, suggesting the possibility that it formed by changing from the arc - trench system to the collision zone. We will further attempt to systematize this result compared with the tectonic setting and the metamorphic process of high-temperature metamorphic rocks in other areas.

Free Research Field

地質学