Tsuji, Takashi et al. (2005): High-resolution chronology of the lower Pleistocene Otadai and Umegase formations of the Kazusa Group, Boso Peninsula, central Japan; chronostratigraphy of the JNOC TR-3 cores based on oxygen isotope, magnetostratigraphy and calcareous nannofossil

Leg/Site/Hole:
ODP 111
ODP 138
DSDP 94
DSDP 94 607
ODP 111 677
ODP 138 849
Identifier:
2005-055108
georefid

Creator:
Tsuji, Takashi
JAPEX Research Center, Chiba, Japan
author

Miyata, Yuichiro
Yamaguchi University, Japan
author

Okada, Makoto
Ibaraki University, Japan
author

Mita, Isao
Nihon Tennen Gas, Japan
author

Nakagawa, Hiroshi
Geowindow, Japan
author

Sato, Yuri
Japan Overseas Cooperation Volunteers, Tanzania
author

Nakamizu, Masaru
Japan Oil, Gas and Metal National Corporation, Japan
author

Identification:
High-resolution chronology of the lower Pleistocene Otadai and Umegase formations of the Kazusa Group, Boso Peninsula, central Japan; chronostratigraphy of the JNOC TR-3 cores based on oxygen isotope, magnetostratigraphy and calcareous nannofossil
2005
Chishitsugaku Zasshi = Journal of the Geological Society of Japan
Nippon Chishitsugaku Gakkai, Tokyo, Japan
111
1
1-20
Detailed oxygen isotope stratigraphy using benthic foraminifers (Bolivina robusta, Bulimina aculeata and Melonis pompilioides) from cored hemipelagic mudstones enables the lower Pleistocene Otadai and Umegase Formations of the Kazusa Group in the Boso Peninsula, central Japan, a turbidite sequence with high depositional rate (average depositional rate of hemipelagic mudstone: 0.9 m/k.y.), to be correlated with astronomically tuned pelagic sequences. Remarkable correlation between this isotope curve and those from DSDP Site 607 from the North Atlantic, and ODP Site 677 and Site 849 from the tropical Pacific is well demonstrated magnetostratigraphically based on the Jaramillo normal Subchronozone. Numerical age model can be addressed to each oxygen isotope event in the studied sequence applying the age for correlative event in the deep sea sequence. As a result of this study, the ages of events are determined as follows; 1) the first occurrence of Gephyrocapsa parallela: 1038-1041 ka, 2) the marker tephra layers O7, O11, O12 and O16: 1050-1056 ka, 1067-1070 ka, 1073-1078 ka and 1101-1105 ka, respectively, 3) the base of the Jaramillo normal Subchronozone: 1068-1084 ka, and 4) the boundary between the Otadai and Umegase Formations: 1011-1017 ka. The maximum error of the age determination is about 6 k.y.. Average sedimentary rates of turbidite sandstones, hemipelagic mudstones and total sediments are 1.9 m/k.y., 0.9 m/k.y. and 2.8 m/k.y., respectively.
Japanese
Serial
Coverage:Geographic coordinates:
North:41.0005
West:-110.3111East: 140.1200
South:0.1058

Quaternary geology; algae; Asia; assemblages; benthic taxa; biostratigraphy; biozones; Bolivina; Bolivinitidae; Bulimina; Buliminacea; calcareous composition; Cenozoic; chemostratigraphy; Chiba Peninsula; Coccolithophoraceae; Deep Sea Drilling Project; depositional environment; DSDP Site 607; Far East; Foraminifera; geochemistry; Gephyrocapsa; Gephyrocapsa parallela; high-resolution methods; Honshu; Invertebrata; IPOD; isotope ratios; isotopes; Japan; Jaramillo Subchron; Kasamori Formation; Kazusa Group; Kiwada Formation; Kokumoto Formation; Kurotaki Formation; Leg 111; Leg 138; Leg 94; lower Pleistocene; magnetostratigraphy; Mandano Formation; Melonis; microfossils; Miura Group; nannofossils; O-18/O-16; Ocean Drilling Program; ODP Site 677; ODP Site 849; Ohara Formation; Otadai Formation; oxygen; paleoenvironment; paleomagnetism; Plantae; Pleistocene; Protista; Quaternary; Rotaliina; sedimentary rocks; sedimentation; sedimentation rates; Shimosa Group; stable isotopes; turbidite; Umegase Formation;

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