一般社団法人日本鉱物科学会2019年年会・総会
2019年9月19日〜9月23日九州大学伊都キャンパス
一般社団法人日本鉱物科学会2019年年会・総会
2019年9月19日〜9月23日九州大学伊都キャンパス
[R8-01]Zircon–monazite–garnet behaviours during high-grade metamorphism in the Kontum Massif, Vietnam
*Vuong Thi Sinh Bui1, Yasuhito Osanai2, Nobuhiko Nakano2, Tatsuro Adachi2, Ippei Kitano2, Masaaki Owada3(1. ISGS, Kyushu Univ., 2. SCS, Kyushu Univ., 3. Sci, Yamaguchi Univ.)
The Kontum Massif, central Vietnam composes of three main complexes: the Kannack (KC), Ngoc Linh (NLC) and Kham Duc Complexes (KDC). This study carried out monazite EPMA dating and zircon LA-ICP-MS dating from pelitic gneisses and mafic granulites from all three complexes, combining with zircon–monazite–garnet geochemistry. The results indicated that the ca. 250 Ma high temperature metamorphism in the KC, two high-grade metamorphic events at ca. 440–450 and 240–250 Ma in the NLC, and the medium pressure metamorphism at ca. 240 Ma in the KDC.