Hiroshi Kaiden
National Institute of Polar Research
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Geology | 2015
Yusuke Suganuma; Makoto Okada; Kenji Horie; Hiroshi Kaiden; Mami Takehara; Ryoko Senda; Jun-Ichi Kimura; Kenji Kawamura; Yuki Haneda; Osamu Kazaoka; Martin J. Head
ABSTRACTThe youngest geomagnetic polarity reversal, the Matuyama-Brunhes boundary (MBB), provides an important datum plane for sediments, ice cores, and lavas. Its frequently cited age of 780 ka is based on orbital tuning of marine sedimentary records, and is supported by 40 Ar/ 39 Ar dating of Hawaiian lavas using recent age calibrations. Challenging this age, how-ever, are reports of younger astrochronological ages based on oxygen isotope stratigraphy of high-sedimentation-rate marine records, and cosmogenic nuclides in marine sediments and an Antarctic ice core. Here, we present a U-Pb zircon age of 772.7 ± 7.2 ka from a marine-deposited tephra just below the MBB in a forearc basin in Japan. U-Pb dating has a distinct advantage over 40 Ar/ 39 Ar dating in that it is relatively free from assumptions regarding stan-dardization and decay constants. This U-Pb zircon age, coupled with a newly obtained oxygen isotope chronology, yields an MBB age of 770.2 ± 7.3 ka. Our MBB age is consistent with those based on the latest orbitally tuned marine sediment records and on an Antarctic ice core. We provide the first direct comparison between orbital tuning, U-Pb dating, and magnetostratig-raphy for the MBB, fulfilling a key requirement in calibrating the geological time scale.INTRODUCTION
The Journal of Geology | 2010
Sotaro Baba; Tomokazu Hokada; Hiroshi Kaiden; Daniel J. Dunkley; Masaaki Owada; Kazuyuki Shiraishi
We applied SHRIMP zircon U-Pb age dating to ultrahigh-temperature (UHT) sapphirine-bearing orthopyroxene garnet (SOG) granulite and biotite-hornblende (Bt-Hbl) gneiss in the Schirmacher Hills, East Antarctica. In the Bt-Hbl gneiss, concordant ages of and Ma were obtained from zircon overgrowth rims and zircon cores, with oscillatory and irregular zoning, respectively. The zircon overgrowth rims ( Ma) with low Th/U ratios from the Bt-Hbl gneiss are interpreted as having a metamorphic origin. Oscillatory-zoned and/or irregularly zoned zircon cores may have crystallized during an igneous event at Ma; 800-Ma igneous events have not previously been recognized in central Dronning Maud Land (DML) inland nunatak. Zircons in the SOG granulite yielded a concordant age of Ma, using analyses of sector-zoned and simple-zoned grains. These zircons have relatively high Th/U ratios with a narrow range, and they occur in association with garnet breaking down to form cordierite. The -Ma age obtained from these zircons is interpreted as the timing of crystallization from a high-Th/U partial melt soon after peak metamorphism. The combination of a ca. 800-Ma igneous age and 660–640-Ma metamorphic ages obtained from Schirmacher Hills is different from that of other neighboring parts of central DML. In addition, a metamorphic PT path involving ultrahigh temperatures at early and subsequent isobaric cooling (IBC) stages at around 650 Ma has not previously been known in the central DML nunatak region. The ca. 650-Ma UHT metamorphic event probably occurred in a back-arc tectonic setting and predates the main collisional event of central DML (ca. 550–500 Ma).
Geochimica et Cosmochimica Acta | 2005
Keiji Misawa; Akira Yamaguchi; Hiroshi Kaiden
Earth and Planetary Science Letters | 2012
Takafumi Niihara; Hiroshi Kaiden; Keiji Misawa; Toshimori Sekine; Takashi Mikouchi
Island Arc | 2006
Tadashi Usuki; Hiroshi Kaiden; K. Misawa; Kazuyuki Shiraishi
Archive | 2012
Takahiro Hiroi; Hiroshi Kaiden; Keiji Misawa; Hideyasu Kojima; K. Uemoto; M. Ohtake; Tomoko Arai; Sho Sasaki; Hiroshi Takeda; L. E. Nyquist; C.-Y. Shih
Journal of The European Ceramic Society | 2005
Munenori Nakai; Hiroshi Kaiden; J.H. Lee; Akira Yoshikawa; Kazumasa Sugiyama; T. Fukuda
Antarctic Record | 2012
Noriyoshi Tsuchiya; Masahiro Ishikawa; M. Satish-Kumar; Tetsuo Kawakami; Hideyasu Kojima; Hiroshi Kaiden; Hideki Miura; Yusuke Suganuma; Mikio Abe; Daisuke Sasaki; Masanori Chiba; Yutaka Okada; Fumio Hashizume; Goeff Grantham; Steven Goderis
Antarctic meteorite research | 2000
Hideyasu Kojima; Hiroshi Kaiden; Toru Yada
Antarctic meteorite research | 1998
Hiroshi Kaiden; Takashi Mikouchi; Masamichi Miyamoto