Zircon and apatite thermochronology of the Nankai Trough accretionary prism and trench, Japan; sediment transport in an active and collisional margin setting

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doi: 10.1002/tect.20033
Author(s): Clift, Peter D.; Carter, Andrew; Nicholson, Uisdean; Masago, Hideki
Author Affiliation(s): Primary:
Louisiana State University, Department of Geology and Geophysics, Baton Rouge, LA, United States
Birkbeck College London, United Kingdom
Shell International E & P, Netherlands
Center for Deep Earth Exploration, Japan
Volume Title: Tectonics
Source: Tectonics, 32(3), p.377-395. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0278-7407 CODEN: TCTNDM
Note: In English. 88 refs.; illus., incl. 2 tables, sketch maps
Summary: The Nankai accretionary complex is the most recent addition to the accretionary complexes of southwest Japan and has preserved a record of sediment flux to the trench during its construction. In this study, we use U-Pb zircon and fission track analysis of both zircons and apatites from sediments taken from the forearc and trench of the Nankai Trough, as well as rivers from southwest Japan to examine the exhumation history of the margin since the Middle Miocene. Modern rivers show a flux dominated by erosion of the Mesozoic-Eocene Shimanto and Sanbagawa accretionary complexes. Only the Fuji River, draining the collision zone between the Izu and Honshu arcs, is unique in showing much faster exhumation. Sediment from the Izu-Honshu collision is not found 350-500 km along the margin offshore Kyushu indicating limited along-strike sediment transport. Sediment deposited since 2 Ma on the midtrench slope offshore the Muroto Peninsula of Shikoku (ODP Site 1176) and on the lower slope trenchward of the Kumano Basin (IODP Sites C0006E and C0007E) shares the dominant source in the Shimanto and Sanbagawa complexes seen in the modern rivers. Prior to 5 Ma, additional sediment was being sourced from further north in more slowly exhumed terrains, ∼350 km from the trench axis. Around 9.4 Ma, U-Pb zircon ages of ∼1800 Ma indicate enhanced erosion from the North China Craton, exposed in northern Honshu. In the middle Miocene, at ∼15.4 Ma, the sediment was being derived from a much wider area including the Yangtze Craton (U-Pb ages ∼800 Ma). We suggest that this enhanced catchment may have reflected the influence of the Yangtze River in supplying into the Shikoku Basin prior to rifting of the Okinawa Trough at 10 Ma and migration of the Palau-Kyushu Ridge to form a barrier to transport. The restriction of Nankai Trough provenance to Mesozoic source partly reflects continued uplift of the Shimanto and Sanbagawa complexes since the Middle Miocene. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 03 Geochronology; 12 Stratigraphy, Historical Geology and Paleoecology; Absolute age; Accretionary wedges; Apatite; Asia; Cenozoic; China; Continental margin sedimentation; Dates; Depositional environment; Expedition 316; Far East; Fission-track dating; Fuji River; Geochronology; Honshu; Honshu Arc; IODP Site C0006; IODP Site C0007; Integrated Ocean Drilling Program; Izu-Bonin Arc; Japan; Kumano Basin; Kyushu; Leg 190; Marine sedimentation; Middle Miocene; Miocene; NanTroSEIZE; Nankai Trough; Neogene; Nesosilicates; North China Platform; North Pacific; Northwest Pacific; ODP Site 1176; Ocean Drilling Program; Ocean floors; Orthosilicates; Pacific Ocean; Paleoenvironment; Phosphates; Pleistocene; Pliocene; Provenance; Quaternary; Relative age; Sambagawa Belt; Sediment transport; Sedimentation; Sediments; Shimanto Belt; Silicates; Subduction zones; Tertiary; Thermochronology; Transport; Trenches; U/Pb; West Pacific; Yangtze River; Zircon; Zircon group
Coordinates: N330100 N330200 E1364800 E1364800
N330114 N330119 E1364757 E1364753
N323400 N323500 E1344000 E1343900
Record ID: 2013072655
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom