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

Author(s): Tsuji, Takashi; Miyata, Yuichiro; Okada, Makoto; Mita, Isao; Nakagawa, Hiroshi; Sato, Yuri; Nakamizu, Masaru
Author Affiliation(s): Primary:
JAPEX Research Center, Chiba, Japan
Yamaguchi University, Japan
Ibaraki University, Japan
Nihon Tennen Gas, Japan
Geowindow, Japan
Japan Overseas Cooperation Volunteers, Tanzania
Japan Oil, Gas and Metal National Corporation, Japan
Volume Title: Chishitsugaku Zasshi Journal of the Geological Society of Japan
Source: Chishitsugaku Zasshi = Journal of the Geological Society of Japan, 111(1), p.1-20. Publisher: Nippon Chishitsugaku Gakkai, Tokyo, Japan. ISSN: 0016-7630 CODEN: CHTZA5
Note: In Japanese with English summary. 67 refs.; illus., incl. 6 tables, geol. sketch map
Summary: 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.
Year of Publication: 2005
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Asia; Assemblages; Benthic taxa; Biostratigraphy; Biozones; Bolivina; Bolivinitidae; Bulimina; Buliminacea; Calcareous composition; Cenozoic; Chemostratigraphy; Chiba Peninsula; Coccolithophoraceae; DSDP Site 607; Deep Sea Drilling Project; Depositional environment; Far East; Foraminifera; Geochemistry; Gephyrocapsa; Gephyrocapsa parallela; High-resolution methods; Honshu; IPOD; Invertebrata; 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; ODP Site 677; ODP Site 849; Ocean Drilling Program; Ohara Formation; Otadai Formation; Oxygen; Paleoenvironment; Paleomagnetism; Plantae; Pleistocene; Protista; Quaternary; Rotaliina; Sedimentary rocks; Sedimentation; Sedimentation rates; Shimosa Group; Stable isotopes; Turbidite; Umegase Formation
Coordinates: N351400 N352000 E1401200 E1400900
N410004 N410005 W0325726 W0325727
N011203 N011209 W0834413 W0834414
N001058 N001100 W1103110 W1103111
Record ID: 2005055108
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