Estimation of exhumation rate of low P/T type metamorphic belt using conventional geothermobarometry

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400511
• 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: Nagoya University
• Principal Investigator: Enami Masaki 名古屋大学, 宇宙地球環境研究所, 教授 (20168793)
• Co-Investigator(Kenkyū-buntansha): KATO Takenori 名古屋大学, 宇宙地球環境研究所, 准教授 (90293688) ; TSUBOI Motohiro 関西学院大学, 理工学部, 教授 (60411774)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 花こう岩類 / 変成岩類 / 地質温度計 / 地質圧力計 / 上昇速度 / 低圧型変成帯

Outline of Final Research Achievements

Kaizuki-yama granite, which intruded into the Jurassic Mino terrane, were estimated using conventional geothermobarometers, and a possible cooling process of the body was proposed. Calcic plagioclase (up to An90) was commonly occurs in the granite, and is consider to show evidence for assimilation of limestone and/or skarn in country rocks during intrusion of acidic magma.
(2) Exhumation rate of low-pressure/high-temperature type Ryoke belt was discussed based on petrological and mineralogical studies of granitoids and their surrounding metapelites. The “Kamihara tonalite”, one of the oldest intrusive bodies, is separated into two groups considering their forming conditions.

Free Research Field

Metamorphic Petrology