Radiolarians from dredged sedimentary rocks from off southeast Boso Peninsula

We report radiolarian fossils from sedimentary rocks recovered from off southeast Boso Peninsula, central Japan to determine the age of the rocks. Rock samples were collected from sites D03 and D04 on the steep slopes close to the Katsuura Submarine Canyon using a dredge during the cruise KT-12-35....

Full description

Saved in:
Bibliographic Details
Published inJAMSTEC REPORT OF RESEARCH AND DEVELOPMENT Vol. 27; pp. 77 - 86
Main Authors Yoshimoto, Keita, Motoyama, Isao, Kawamura, Kiichiro
Format Journal Article
LanguageEnglish
Japanese
Published Yokohama Japan Agency for Marine-Earth Science and Technology 01.09.2018
Japan Science and Technology Agency
Subjects
Amatsu Formation
Basins
Fossils
Geological time
Miocene
Miura Group
Pliocene
R/V Tansei-maru
Radiolaria
Sedimentary rocks
Online AccessGet full text
ISSN1880-1153
2186-358X
DOI10.5918/jamstecr.27.77

Cover

More Information
Summary:We report radiolarian fossils from sedimentary rocks recovered from off southeast Boso Peninsula, central Japan to determine the age of the rocks. Rock samples were collected from sites D03 and D04 on the steep slopes close to the Katsuura Submarine Canyon using a dredge during the cruise KT-12-35. The radiolarian assemblages suggested a geologic age of 8.84–7.74 Ma (middle Late Miocene) for the site D03 (southeast slope of the Awa-Bank) and two geologic ages of 4.5–4.3 Ma (middle Pliocene) and 11.8–9.0 Ma (early Late Miocene) for the site D04 (north slope from the Katsuura Submarine Canyon). These ages correspond to depositional ages of the Amatsu Formation of the Miura Group (forearc basin deposits), the Nishizaki Formation (accretionary prism) and the Minami-Boso Group (trench slope basin deposits) exposed on the Boso Peninsula.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1880-1153
2186-358X
DOI:10.5918/jamstecr.27.77