Thermal evolution of the Tertiary Shimanto Belt, Muroto Peninsula, Shikoku, Japan

Underwood, Michael B.; Laughland, Matthew M.; Byrne, Tim; Hibbard, James P.; DiTullio, Lee

doi:10.1111/j.1440-1738.1992.tb00064.x

Cited by 29 publications

(26 citation statements)

References 62 publications

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“…Evidence presented by Osozawa (1992) and Sakaguchi (1996) suggests Paleocene subduction of the ridge between the Kula plate and either the Pacific or the North New Guinea plate, according to the particular reconstruction used. A second ridge subduction event was related to subduction of the Shikoku basin and its actively spreading ridge from c. 15 Ma (Hibbard & Karig 1990;Underwood et al 1992). The thermal history of the Shimanto belt suggests two episodes of cooling at _<70 Ma and c. 15 Ma, respectively (Tagami et al 1995), consistent with uplift following each of the ridge subduction events.…”

Section: Cretaceous-neogene Examplesmentioning

confidence: 93%

Ridge-trench interactions and high- T -low- P metamorphism, with particular reference to the Cretaceous evolution of the Japanese Islands

Brown

1998

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A corollary of plate tectonics is that spreading ridges ultimately interact with trenches; this is a consequence of the closure phase of the Wilson cycle that eliminates ocean basins. Ridge-trench interactions generate distinctive igneous, metamorphic, structural and sedimentation effects, which commonly are diachronous parallel to the trench; effects vary with plate boundary geometry and rate of migration is controlled by relative motion vectors. Identification of such interactions in the geological record is uncommon, which suggests that geological events triggered by ridge trench interactions are attributed to other phenomena, such as changes in plate motion or a singularity at the trench. The estimated greater length of plate boundaries in the past means that subduction of a spreading ridge system could have been more common earlier in Earth history.High-T-low-P metamorphism requires a tectonic setting that allows enhanced heat flux, transient advection of heat due to magma ascent, unusually large internally generated heat, or some combination of these features. Subduction of a spreading ridge system produces anomalously high temperatures at shallow crustal depth through the development of a slab window, which allows transfer of sub-slab asthenospheric mantle across the slab to create an enhanced heat flux beneath the overriding plate. This process is important along convergent margins that develop a subduction-accretion complex, and drives low P/T ratio metamorphism and anatexis of the complex. Heat transport occurs by rising magma near the trench, which leads to formation of plutons with characteristic contaminated MORB geochemistry. Near-trench igneous activity and low PIT ratio metamorphism are the most striking features attributable to spreading ridge subduction and slab window formation, and together are likely to be diagnostic of ridge trench interactions.

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Section: Cretaceous-neogene Examplesmentioning

confidence: 93%

Ridge-trench interactions and high- T -low- P metamorphism, with particular reference to the Cretaceous evolution of the Japanese Islands

Brown

1998

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“…It has also been suggested that the outcrop‐scale deformation in this region is not related to the later deformation but rather to the primary formation of the accretionary complex [ DiTullio and Byrne , ; DiTullio et al , ]. The thermal overprint increases with increasing proximity to Cape Muroto, where the gabbroic rocks and MORB‐type basalt dating from approximately 13 Ma are exposed [ Mori and Taguchi , ; Underwood et al , , ]. In the south of the Muroto Peninsula, near Sakihama, unexplained enigmatic andesitic pillow lavas are exposed (Figure ) [ Hibbard and Karig , ; Mizoguchi et al , ].…”

Section: Geology and Geophysics Of The Shimanto Belt On Shikoku Islandmentioning

confidence: 99%

Middle Miocene swift migration of the TTT triple junction and rapid crustal growth in southwest Japan: A review

et al. 2014

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We review recent progress in geological and geophysical investigation in SW Japan, Nankai Trough, and Philippine Sea Plate (PSP), and propose a hypothesis for the Miocene tectonics in SW Japan driven by middle Miocene swift migration of the TTT (trench-trench-trench) triple junction. The new hypothesis is based on the new interpretations as follows. Near-trench magmatism in the outer zone of SW Japan is ascribed to a collision of proto-Izu arc in addition to the previous model of an oceanic ridge of the Shikoku Basin and hot PSP subduction. The indentation structures at Capes Ashizuri, Muroto in Shikoku, and Shiono on the Kii Peninsula were previously explained by "kink folding" due to recent E-W compression. We alternatively suppose the collision of the active arc or topographic peaks such as seamounts inferred from geological and experimental observations. The main crustal component in SW Japan is suggested to be of igneous plutonic rocks rather than the previous interpretation of Cretaceous to Tertiary accretionary complexes. This is typically illustrated in the outer zone to the north of Capes Ashizuri, Muroto, and Shiono from geophysical observation of gravity anomalies, velocity and resistivity, together with geological estimations of caldera age and the size of its root pluton. Episodic crustal growth due to intrusion of igneous rock and subduction of the PSP may have stopped after approximately 12 Ma and restarted at approximately 6 Ma. Our emphasis for this gap is a cessation and resurgence of subduction rather than the previous interpretation, i.e., decreasing of subduction rate.

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“…In contrast to modern accretionary prisms, the large‐scale structures of ancient accretionary complexes formed in subduction zones, which are now often exposed at the surface, have been predominantly understood using geological information, such as sediment ages and paleotemperatures. Vitrinite reflectance, the degree of graphitization of the carbonaceous material included within terrigeneous sediments, is a strong tool that can be used to estimate maximum paleotemperatures [ Barker , ; Barker and Pawlewicz , ; Calundann et al ., ; Barker , ; Sweeney and Burnham , ], and vitrinite reflectance geothermometers have been widely used to reconstruct the tectonic evolution of on‐land accretionary complexes [e.g., Moore and Allwardt , ; Underwood and Strong , ; Sample and Moore , ; Underwood and Howell , ; Underwood et al ., ; Sakaguchi , ; Ohmori et al ., ; Kondo et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Paleothermal structure of the Nankai inner accretionary wedge estimated from vitrinite reflectance of cuttings

Fukuchi

Yamaguchi

Yamamoto

et al. 2017

Geochem Geophys Geosyst

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The paleothermal structure and tectonic evolution of an accretionary prism is basic information for understanding subduction zone seismogenesis. To evaluate the entire paleotemperature profile of the Integrated Ocean Drilling Program (IODP) Site C0002 located in the off‐Kumano region of the Nankai Trough and penetrate the inner accretionary wedge down to 3058.5 m below the seafloor (mbsf), we performed a vitrinite reflectance analysis for cuttings and core samples during IODP expeditions 338 and 348: Nankai Trough seismogenic zone experiment. Although vitrinite reflectance values (Ro) tend to increase with depth, two reversals of these values suggested the existence of thrust fault zones with sufficient displacements to offset the paleothermal structure. The estimated maximum paleotemperatures are 42–70°C at 1200–1300 mbsf, 44–100°C at 1600–2400 mbsf, and 56–115°C at 2600–3000 mbsf, respectively. These temperatures roughly coincide with estimated modern temperatures; however, at a smaller scale, the reconstructed partial paleogeothermal gradient (∼60–150°C/km) recorded at the hanging‐ and footwall of the presumed thrust fault zone is higher than the modern geothermal gradient (∼30–40°C/km). This high paleogeothermal gradient was possibly obtained prior to subduction, reflecting the large heat flow of the young Philippine Sea Plate.

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Thermal evolution of the Tertiary Shimanto Belt, Muroto Peninsula, Shikoku, Japan

Cited by 29 publications

References 62 publications

Ridge-trench interactions and high- T -low- P metamorphism, with particular reference to the Cretaceous evolution of the Japanese Islands

Ridge-trench interactions and high- T -low- P metamorphism, with particular reference to the Cretaceous evolution of the Japanese Islands

Middle Miocene swift migration of the TTT triple junction and rapid crustal growth in southwest Japan: A review

Paleothermal structure of the Nankai inner accretionary wedge estimated from vitrinite reflectance of cuttings

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