Os isotope stratigraphy of a ferromanganese crust: Its principles and applications

Tatsuo NOZAKI; Kosuke T. GOTO; Ayaka TOKUMARU; Yutaro TAKAYA; Katsuhiko SUZUKI; Qing CHANG; Jun-ichi KIMURA; Yasuhiro KATO; Gen SHIMODA; Takashi TOYOFUKU; Akira USUI; Tetsuro URABE

Presentation information

Oral

Symbol S (Solid Earth Sciences) » S-RD Resources, Mineral Deposit & Resource Exploration

[S-RD45_28PM1] New progress of resource geology: global environmental change and element enrichment

Mon. Apr 28, 2014 2:15 PM - 4:00 PM 415 (4F)

Convener:*Mihoko Hoshino(National Institute of Advanced Industial Science and Technology), Kyoko Yamaoka(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Tatsuo Nozaki(Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology), Ryohei Takahashi(Graduate School of Engineering and Resource Science, Akita University), Chair:Kyoko Yamaoka(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Tatsuo Nozaki(Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology)

2:45 PM - 3:00 PM

[SRD45-02] Os isotope stratigraphy of a ferromanganese crust: Its principles and applications

*Tatsuo NOZAKI¹, Kosuke T. GOTO², Ayaka TOKUMARU³, Yutaro TAKAYA⁴, Katsuhiko SUZUKI¹, Qing CHANG¹, Jun-ichi KIMURA¹, Yasuhiro KATO⁴, Gen SHIMODA², Takashi TOYOFUKU⁵, Akira USUI⁶, Tetsuro URABE³ (1.JAMSTEC/IFREE, 2.AIST/GSJ, 3.Univ. of Tokyo, 4.Univ. of Tokyo, 5.JAMSTEC/BIOGEOS, 6.Kochi Univ.)

Keywords:ferromanganese crust, Os isotope, geochemistry, growth hiatus, paleoceanography

Sedimentation age determination by using an Os isotope stratigraphy is one of the effective dating methods for a ferromanganese crust. This dating method is applicable to the almost whole sedimentation age of a ferromanganese crust from the Late Cretaceous to present. So far, we have applied the Os isotope dating method to various ferromanganese crust samples collected from Northwestern Pacific, South Atlantic Oceans and Philippine Sea. In this presentation, we introduce the principles and applications of the Os isotope dating method, and discuss our recent results especially focusing on the growth hiatus of a ferromanganese crust.