Cambrian granulite to upper amphibolite facies metamorphism of post-795 Ma sediments in Madagascar
(Ito et al., 1997, The Journal of Earth and Planetary Sciences, Nagoya University)
CHIME monazite and xenotime ages were determined for two parangeisses from Madagascar. These data suggest that the high-grade paragneiss in Madagascar formed through the single thermal event at c.a. 530 Ma and this metamorphism can be linked to the continental collision that resulted in Gondwana supercontinent.
CHIME ages of zircons in granitic gneiss and granite from Samilpo, southeastern Democratic People's Republic of Korea
(Kato et. al., 1997, The Journal of Earth and Planetary Sciences, Nagoya University)
The CHIME dating was carried out for zircons from granitic gneiss and granite from Samilpo, southeastern Democratic People's Republic of Korea (North Korea). Zircon grains in granitic gneiss show a distinct core-rim structure; the cores yielded an early Proterozoic age of 2133 +/- 56 Ma, and the rims yielded a poorly refined age of ca. 1500 ma. Zircon grains in the granite show a middle Jurassic age of 172 +/- 4 Ma, suggesting the granite to be assigned to the Jurassic Daebo Granite.
Chemical Th-U-total Pb isochron age of zircon from the Mereb Granite in northern Ethiopia
(Tadesse et al., 1997, The Journal of Earth and Planetary Sciences, Nagoya University)
CHIME age was determined fro zircon grains from the post-tectonic Mereb Granite in northern Ethiopia. The obtained 545 ± 24 CHIME zricon age is younger than the previously reported Rb-Sr whole-rock isocrhon age of 633 ± 62 Ma, but agrees well with the 541 ± 16 Ma U-Pb zircon age for the post-tectonic Mao granite in western Ethiopia.
CHIME dating of monazite from pelitic hornfels of the Kurihashi Granodiorite, Kitakami Mountains
(Suzuki et al., 1996, The Journal of Earth and Planetary Sciences, Nagoya University)
The Cretaceous Kurihashi Granodiorite in the Kitakami Mountains contains no monazite grain. To date the timing of the emplacement of the Kurihashi Granodiorite, monazite in a hornfels from the immediate contact of the granodiorite was analyzed. The monazite grains define an isochron of 117.7 ± 2.0 Ma. This age can be interpreted as the timing of the monazite formation durinc the contact metamorphism.
Precambrian detrital monazites and zircons from Jurassic turbidite sandstones in the Nomugi area, Mino terrane.
(Adachi & Suzuki, 1994, The Journal of Earth and Planetary Sicences, Nagoya University)
CHIME ages of monazite grains from Jurassic sandstones in the Nomugi area yield middle Precambrian ages, ca. 250 Ma and ca. 180 Ma. Zircon graines yield middle Precambrian ages and middle Oldvician ages. These ages indicate that the clastic materials were derived from a provenance having Preambrian granitoids and metamorphics, and Paleozoic-Mesozoic granitoids and metamorphics.