The cessation of igneous activity and uplift when an actively spreading ridge is subducted beneath an island arc

Osozawa, Soichi

doi:10.1111/j.1440-1738.1997.tb00046.x

Cited by 22 publications

(6 citation statements)

References 39 publications

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“…A second important feature of these plate reconstructions is they predict the presence of a spreading ridge between the Izanagi Plate and the Pacific Plate to the south. This ridge is predicted to interact with the Japanese archipelago sometime in the late Cretaceous as has been pointed out by several previous workers (Uyeda & Miyashiro, 1974; Maruyama, 1997; Osozawa, 1997). The interaction of plate boundaries with subduction zones is likely to result in a major reorganization of plates including the formation of new plates and changes in the motion vector of preexisting plates.…”

Section: Western Pacific Cretaceous Plate Reconstructionssupporting

confidence: 66%

Plate movements, ductile deformation and geochronology of the Sanbagawa belt, SW Japan: tectonic significance of 89–88 Ma Lu–Hf eclogite ages

Wallis

Anczkiewicz

Endo

et al. 2009

Journal Metamorphic Geology

107

102

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Prograde P-T paths and thermal modelling suggest metamorphism in the Sanbagawa belt represents unusually warm conditions for subduction-type metamorphic belts, and these likely reflect conditions of a convergent margin a few million years before the arrival of an active spreading ridge. Radiometric age data and kinematic indicators of ductile deformation suggest the Sanbagawa belt formed in a Cretaceous convergent margin associated with a plate movement vector that had a large sinistral oblique component with respect to the belt, the East Asian margin. Plate reconstructions for the Cretaceous to Tertiary for this region show that the only plausible plate compatible with such motion at this time is the Izanagi plate. These reconstructions also show that progressively younger sections of the Izanagi plate were subducted beneath eastern Asia, i.e. a spreading ridge approached, until 85-83 Ma when the Izanagi Plate ceased to exist as an independent plate. The major reorganization of plates and associated movements around this time is likely to be the age of major interaction between the ridge and convergent margin. The ridge-approach model for the Sanbagawa metamorphism, therefore, predicts that peak metamorphism is a few million years older than this age range. New Lu-Hf dating of eclogite in the Sanbagawa belt gives ages of 89-88 Ma, in excellent agreement with the prediction. Combining this estimate for the peak age of metamorphism with published P-T-t results implies vertical exhumation rates of greater than 2.5 cm yr )1 . This high rate of exhumation can explain the lack of a significant thermal overprint in the Sanbagawa belt during subduction of the ridge.

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Section: Western Pacific Cretaceous Plate Reconstructionssupporting

confidence: 66%

Plate movements, ductile deformation and geochronology of the Sanbagawa belt, SW Japan: tectonic significance of 89–88 Ma Lu–Hf eclogite ages

Wallis

Anczkiewicz

Endo

et al. 2009

Journal Metamorphic Geology

107

102

View full text Add to dashboard Cite

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“…Hibbard and Karig (1990b) noted that initiation of shallow‐marine basin atop the Shimanto accretionary prism was related to Shikoku Ridge subduction and possibly reflected the topographic change in the subducting plate. The forearc uplift caused by ridge subduction was also proposed by Osozawa (1997). The same can also be suggested to the Oka olistostrome, located in the northern belt segment that experienced the similar ridge subduction event.…”

Section: Discussionmentioning

confidence: 76%

The Oka Belt (Southern Siberia and Northern Mongolia): A Neoproterozoic analog of the Japanese Shimanto Belt?

et al. 2007

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The Oka Belt, composed of clastic rocks and greenschists, extends for approximately 600 km in the South-Siberian Sayan region and adjacent northern Mongolia. For a long time the Oka Belt's age and tectonic setting were the most controversial problem in the region. We argue that the belt was formed in Late Neoproterozoic as an accretionary prism. The Oka Belt shows imbricated thrust structure, which had originally seaward vergence and reflected the Neoproterozoic accretion process. The Early Paleozoic orogeny had minor effect on its structural style. The belt contains tectonic slivers of mid-ocean ridge basalts, some oceanic-island basalts and possible pelagic sediments. In several localities they are associated with gabbro and serpentinite. All these rocks represent the oceanic lithosphere subducting beneath the Oka prism and trapped within it. In the inner zone of the Oka Belt are the blueschists exhumed from the deeper prism level. The northern Oka Belt includes mafic intrusions geochemically similar to normal mid-oceanic ridge basalt and felsic volcaniclastic rocks. This segment of the belt is very similar to the Tertiary portion of northern Shimanto Belt, in Japan, and has also experienced the subduction of orthogonal oceanic ridge beneath the prism. This event dates back to 753 ± 16 Ma (the U-Pb zircon discordia). The Oka prism started accreting in MidNeoproterozoic after the subduction had initiated under the Japan-like South-Siberian continental terrain. The prism existed through the second half of Neoproterozoic and accumulated a huge volume of sialic material to enlarge the nearby continent. Currently, the Oka Belt remains poorly studied and is very promising for further investigation and discoveries.

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“…A review of recent geochronological data in the eastern Asian continent (Song et al, ) shows that this period also marked the culmination of major tectonic (Choi & Lee, ; Grimmer et al, ), magmatic (Akinin & Miller, ; Cheng & Mao, ; Osozawa, ; Sagong et al, ; Soloviev et al, ; Tikhomirov et al, ), and metamorphic (Aoki et al, ; Bogdanov & Khain, ; Itaya et al, ; Ota & Kaneko, ; Wallis et al, ; Yui et al, ) processes along the continental margin, indicating that the short time interval ~88–86 Ma constrained the Late Cretaceous climax of the compression across eastern Asia. Comparative analysis shows that compression and exhumation in this period swept over the continental margin from east to west (Song et al, ).…”

Section: Discussionmentioning

confidence: 99%

Post‐rift Tectonic History of the Songliao Basin, NE China: Cooling Events and Post‐rift Unconformities Driven by Orogenic Pulses From Plate Boundaries

et al. 2018

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The classic lithosphere‐stretching model predicts that the post‐rift evolution of extensional basin should be exclusively controlled by decaying thermal subsidence. However, the stratigraphy of the Songliao Basin in northeastern China shows that the post‐rift evolution was punctuated by multiple episodes of uplift and exhumation events, commonly attributed to the response to regional tectonic events, including the far‐field compression from plate margins. Three prominent tectonostratigraphic post‐rift unconformities are recognized in the Late Cretaceous strata of the basin: T11, T03, and T02. The subsequent Cenozoic history is less constrained due to the incomplete record of younger deposits. In this paper, we utilize detrital apatite fission track (AFT) thermochronology to unravel the enigmatic timing and origin of post‐rift unconformities. Relating the AFT results to the unconformities and other geological data, we conclude that in the post‐rift stage, the basin experienced a multiepisodic tectonic evolution with four distinct cooling and exhumation events. The thermal history and age pattern document the timing of the unconformities in the Cretaceous succession: the T11 unconformity at ~88–86 Ma, the T03 unconformity at ~79–75 Ma, and the T02 unconformity at ~65–50 Ma. A previously unrecognized Oligocene unconformity is also defined by a ~32–24 Ma cooling event. Tectonically, all the cooling episodes were regional, controlled by plate boundary stresses. We propose that Pacific dynamics influenced the wider part of eastern Asia during the Late Cretaceous until Cenozoic, whereas the far‐field effects of the Neo‐Tethys subduction and collision processes became another tectonic driver in the later Cenozoic.

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The cessation of igneous activity and uplift when an actively spreading ridge is subducted beneath an island arc

Cited by 22 publications

References 39 publications

Plate movements, ductile deformation and geochronology of the Sanbagawa belt, SW Japan: tectonic significance of 89–88 Ma Lu–Hf eclogite ages

Plate movements, ductile deformation and geochronology of the Sanbagawa belt, SW Japan: tectonic significance of 89–88 Ma Lu–Hf eclogite ages

The Oka Belt (Southern Siberia and Northern Mongolia): A Neoproterozoic analog of the Japanese Shimanto Belt?

Post‐rift Tectonic History of the Songliao Basin, NE China: Cooling Events and Post‐rift Unconformities Driven by Orogenic Pulses From Plate Boundaries

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