Significance of c. 300 Ma CHIME zircon age for post-tectonic granite from the Hercynian suture zone, Bamian, Afghanistan
(Suzuki et al., 2002, Bull. Nagoya Univ. Museum)
CHIME dating was conducted on a sample of massive hornblende-bearing biotite granite collected from a Hercynian suture zone in Bamian, Afghanistan. A total 66 analysis on 12 grains yielded an isochron of 298 +/- 28 Ma. This is the first chronological evidence found for the existence of post-tectonic late Carboniferous to early Permian magmatism in the Hercynian suture zone of central Asia.
Permo-Triassic and Early-Middle Jurassic granitoid clasts from the Jurassic convlomerates in the Mino terrane, central Japan.
(Tanaka et al., 2002, J. Earth Planet. Sci. Nagoya Univ.)
CHIME dating has been applied to determine the ages of seven granitoid clasts in the Jurassic Ohgitani, Bandokoro and Tsukiyozawa conglomerates in the Mino terrane. CHIME dating is also applied to detrital zircon in the Jurassic sandstone near the Ohgitani conglomerate and matrix sandstone of the Ohgitani congolomerate. Both results suggest ca. 250 and 180 Ma igneous activities in the provenance of the Mino terrane.
Computer program for the CHIME age calculation
(Kato et. al., 1999, The Journal of Earth and Planetary Sciences, Nagoya University)
A computer program for the CHIME age calculation is presented.
Preliminary CHIME dating of granites from the Nkambe area, northwestern Cameroon, Africa
(Tetsopgang et al., 1999, The Journal of Earth and Planetary Sciences, Nagoya University)
CHME dating has been adopted for dating the syntectonic foliated and post-tectonic unfoliated granites in northwestern Cameroon. The CHIME age and the concordant relation suggest a ca. 530 Ma metamorphic-plutonic episode in northwestern Camerron.
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.
A preliminary CHIME age determination of monazites from metamorphic and grantic rocks in the Gyeonggi Massif, Korea
(Cho et al., 1996, The Journal of Earth and Planetary Sciences, Nagoya University)
The CHIME dating was carried out for monazite from kyanite-staurolite-garnet schist of the Yeoncheon Group, and from sillimanite-garnet gneiss and two-mica granite in the Gyeonggi Gneiss Complex. The results indicate that the late Permian-early Triassic metamorphism and Jurassic plutonism were more widespread than had been thought in Korean Peninsula.
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.
Late Permian CHIME ages of the Hida Gneiss and early Triassic age of the Mizunashi Granite in the Amo area of the Hida terrane, central Japan
(Khan et al., 1995, The Journal of Earth and Planetary Sciences, Nagoya University)
The CHIME dating of the Hida Gneiss, the Mizunashi Granite and a pegmatic vein were carried out. The result show that the gneiss and granite cooled to closure temperature of hronblende and muscovite at c.a. 210 Ma and subsequently underwent the intrusion of pegmatite at c.a. 180 Ma. This paper also gives a detail of monazite sample preparation.
CHIME ages of monazite from the Shinshiro Tonalite of the Ryoke belt in the Mikawa area, Aichi Prefecture
(Morishita & Suzuki, 1995, The Journal of Earth and Planetary Sciences, Nagoya University)
Monazite from the leucocratic varieties of the Shinshiro Tonalite yields CHIME age of 86.0 ± 4.7, 85.2 ± 3.3 and 85.5 ± 5.5 Ma. These ages are interpreted as the timing of the emplacement and are consistent with the field relations in the Ryoke metamorphic belt.
CHIME monazite ages of the Otagiri and Ichida Granites in the Komagane area, Nagano Prefecture
(Suzuki et al., 1995, The Journal of Earth and Planetary Sciences, Nagoya University)
The Otagiri Granite which comprises peraluminous fine-grained two-mica granites to granodiorites intrudes into the Ichida Granite in the eastern part of the Ryoke metamorphic belt. CHIME monazite ages of the Otagiri and Ichida Granites are in good harmony with the intrusive relation.
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.
Contribution of grain-boundary REEs to the chemistry of the glass formed by experimental partial-melting of a quarzose paragneiss
(Kajizuka et al., 1994, The Journal of Earth and Planetary Sciences, Nagoya University)
Contribution of grain-boundary REEs to the chemistry of the partial melt was examined in situ melting of a quartzose paragneiss sample. The results suggest that the grain-boundary REEs in source rocks play a key role on the distribution of REEs in granitoids formed through partial melting of crustal rocks.
240 Ma CHIME ages of monazite and zircon from the Hirasawa Granitic Mass in the South Kitakami terrane
(Suzuki & Adachi, 1991, The Journal of Earth and Planetary Sciences, Nagoya University)
CHIME ages were determined for monazite and zircon from the Hirasawa Granitic Mass in the South Kitakami terrane. The results indicate that the late Permian to early Triassic emplacement of the Hirasawa Mass and this corresponds to the major tectonic event between Permian and Triassic period.