@article{oai:nagoya.repo.nii.ac.jp:00001442,
 author = {TANAKA, Shiro and SUZUKI, Kazuhiro and ADACHI, Mamoru},
 journal = {The Journal of earth and planetary sciences, Nagoya University},
 month = {},
 note = {CHIME (chemical Th-U-total Pb isochron method) has been applied to determine the ages of two gneiss clasts which are bearing Mg-rich garnet (pyrope content up to 30-40 mol%) from the Jurassic Sawando conglomerate in the northeastern Mino terrane, central Japan. The CHIME monazite ages of gneiss clasts range from 1809 to 1494 Ma with two data concentrations of 1750-1700 Ma and 1650-1600 Ma (sample Sawa-13), and from 1601 to 1040 Ma with a data concentration of 1300-1200 Ma (sample Sawa- 43). A detrital zircon in the gneiss clast (Sawa-13) gives the oldest CHIME age of 2064 ± 146 Ma. These CHIME ages of the gneiss clasts indicate occurrence of middle Precambrian poly-phase metamorphism (between ca. 1800 and 1000 Ma) and igneous activity (ca. 2050 Ma), and suggest that the Mg-rich garnet-bearing gneisses were formed by the middle Precambrian metamorphism. Detrital garnets, mostly Mg-rich garnet, are commonly observed in the Jurassic sandstone of the Mino terrane. Mg-rich garnet-bearing rocks like the analyzed gneiss clasts are considered as major source rocks of the Jurassic elastics in the Mino terrane. The CHIME ages of the gneiss clasts suggest that a part of the Jurassic terrigenous elastics, for example detrital monazite and Mg-rich garnet in the Mino terrane were derived from the area which is underlain by middle Precambrian metamorphic and igneous rocks., 国立情報学研究所で電子化したコンテンツを使用している。},
 pages = {1--13},
 title = {CHIME ages of Mg-rich garnet-bearing gneiss clasts from the Jurassic Sawando conglomerate in the northeastern Mino terrane, central Japan},
 volume = {49},
 year = {2002}
}