期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 421, 期 -, 页码 47-57出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2015.04.001
关键词
Shikoku Basin; hemipelagic sediment; Sr-Nd-Pb isotopic compositions; Kuroshio; Philippine Sea plate
资金
- Kochi University
- Japan Drilling Earth Science Consortium
- Grants-in-Aid for Scientific Research [26870418, 26287124] Funding Source: KAKEN
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. (C) 2015 Elsevier B.V. All rights reserved.
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