Sr, Nd, and Pb isotope compositions of hemipelagic sediment in the Shikoku Basin: Implications for sediment transport by the Kuroshio and Philippine Sea plate motion in the late Cenozoic

Yu Saitoh, Tsuyoshi Ishikawa, Masaharu Tanimizu, Masafumi Murayama, Yurika Ujiie, Yuzuru Yamamoto, Kohtaro Ujiie, Toshiya Kanamatsu

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The provenance of hemipelagic sediments in the Shikoku Basin during late Cenozoic time was studied through the temporal variations in the Sr-Nd-Pb isotopic compositions of detrital sediments from Integrated Ocean Drilling Program Site C0011 from the late Miocene (7 Ma) to the present. Detrital sediments at Site C0011 are interpreted as a mixture of sediments originating from the southwest Japan arc and lands around the East China Sea. Sediments from the East China Sea were transported by the Kuroshio, while Japanese sediments were transported by turbidity currents, bottom currents, and ocean surface currents. The isotopic evidence suggests that the main source of hemipelagic sediments gradually changed from the East China Sea to Japan from 4.4 to 2.9 Ma, in accordance with the northward movement of Site C0011 with the Philippine Sea plate in this period. A contemporaneous increase in grain size also supports this interpretation. The beginning period of these changes, 4.4 Ma, conforms closely to the postulated advent or acceleration of trench-normal subduction of the Shikoku Basin lithosphere.

Original languageEnglish
Pages (from-to)47-57
Number of pages11
JournalEarth and Planetary Science Letters
Volume421
DOIs
Publication statusPublished - 2015 Jul 1
Externally publishedYes

Keywords

  • Hemipelagic sediment
  • Kuroshio
  • Philippine Sea plate
  • Shikoku Basin
  • Sr-Nd-Pb isotopic compositions

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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