TY - JOUR
T1 - Sr, Nd, and Pb isotope compositions of hemipelagic sediment in the Shikoku Basin
T2 - Implications for sediment transport by the Kuroshio and Philippine Sea plate motion in the late Cenozoic
AU - Saitoh, Yu
AU - Ishikawa, Tsuyoshi
AU - Tanimizu, Masaharu
AU - Murayama, Masafumi
AU - Ujiie, Yurika
AU - Yamamoto, Yuzuru
AU - Ujiie, Kohtaro
AU - Kanamatsu, Toshiya
N1 - Funding Information:
Authors thank Drs. K. Nagaishi and J. Matsuoka of Marine Works Japan Ltd. for their assistance in isotopic and chemical analysis. This research used samples provided by the Integrated Ocean Drilling Program (IODP). Funding for this research was provided by Kochi University and Japan Drilling Earth Science Consortium . Two anonymous reviewers contributed greatly to improve our manuscript.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - 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.
AB - 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.
KW - Hemipelagic sediment
KW - Kuroshio
KW - Philippine Sea plate
KW - Shikoku Basin
KW - Sr-Nd-Pb isotopic compositions
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U2 - 10.1016/j.epsl.2015.04.001
DO - 10.1016/j.epsl.2015.04.001
M3 - Article
AN - SCOPUS:84928524197
VL - 421
SP - 47
EP - 57
JO - Earth and Planetary Sciences Letters
JF - Earth and Planetary Sciences Letters
SN - 0012-821X
ER -