Space-Time Distribution of Late Mesozoic to Early Cenozoic Magmatism in East Asia and Its Tectonic Implications

Takahashi, Masaki

doi:10.1007/978-94-009-7102-8_6

Cited by 76 publications

(58 citation statements)

References 11 publications

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“…If this is the case, then a minor contribution of YUA and/or YDA components to the Lower Cretaceous sediments with the dominantly OUC provenance suggests that the oblique subduction of the Izanagi plate during the early Cretaceous was not so pronounced. This interpretation is in agreement with Takahashi (1983) and Sakai and Okada (1997), who have suggested that the nature of plate boundary during the early Cretaceous was oblique-slip type and that plate subduction and arc magmatism occurred in Southwest Japan during the Late Cretaceous. It is, however, also possible that the plate margin was the normal subduction type, but the depositional basins were located far from the plate margin and were in close proximity to the ancient Asian continent.…”

Section: Synthesis and Conclusionsupporting

confidence: 92%

Geochemistry of Lower Cretaceous sediments, Inner Zone of Southwest Japan. Constraints on provenance and tectonic environment.

et al. 2000

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A geochemical study was carried out on Lower Cretaceous sedimentary rocks of the Wakino Subgroup, Kenseki Formation, and Sasayama Group, distributed in the Inner Zone of Southwest Japan. The chemical characteristics of the Lower Cretaceous sediments indicate that these rocks are immature firstorder sediments derived from igneous and/or meta-igneous rocks of predominantly felsic composition. The sediments from the Kenseki Formation and the Sasayama Group, however, show high Cr and Ni abundances, suggesting a significant contribution of detritus from ultramafic rocks. Weathering at the source areas was moderate.The high Th/U ratios (mostly > 3.8), negative Eu anomalies (Eu/Eu* between 0.67 and 0.93) and Th/Sc ratios (mostly between 0.5 and 1) of the Lower Cretaceous sediments suggest their derivation dominantly from an old upper crust with minor amounts of young arc-derived detritus. The major, trace and rare earth element compositions imply that deposition took place in an active continental margin environment. The small amounts of young arc-derived material in the sediments support the inference by other workers that arc magmatism was not so prominent in Southwest Japan during the early Cretaceous.

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Section: Synthesis and Conclusionsupporting

confidence: 92%

Geochemistry of Lower Cretaceous sediments, Inner Zone of Southwest Japan. Constraints on provenance and tectonic environment.

et al. 2000

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“…These magnetite-series granitoids possess high magnetic susceptibility (ISHIHARA, 1979) and give rise to positive magnetic anomalies. The distribution of various types of magmatism in East Asia shows that granite and volcanic rocks found in Sikhote Aim, Northeast and Southwest Japan, Southern Korea, and along the coast of Southern China are mostly 130-70 my old (TAKAHASHI, 1983). This is consistent with our model in that the magnetic anomalies already existed before the opening of the Japan Sea.…”

Section: Reconstruction Of Continental Blocks Based On the Magnetic Asupporting

confidence: 90%

A magnetic anomaly map in the Japanese region with special reference to tectonic implications.

Honkura¹,

Okubo²,

Nagaya³

et al. 1991

J. geomagn. geoelec

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Aeromagnetic surveys over the Japanese Islands yielded a detailed magnetic anomaly map. Magnetic anomaly maps were also derived for sea regions surrounding the Japanese Islands from ship-borne magnetic surveys. We combined these maps into a unified magnetic anomaly map for the entire Japanese island arc region. The map enables us to find some characteristic features; in particular, three similar anomaly belts are clearly recognized. We attempted to combine these belts into one linear belt, although they are spatially separated and the direction of elongation is different from one belt to another. This process requires rotations of the blocks constituting the Japanese Islands. The result of our reconstruction of the blocks agrees with the result derived from paleomagnetic studies, supporting the opening of the Japan Sea. This implies that magnetic anomalies serve as markers for the original locations of blocks, in a sense similar to yet slightly different from oceanic magnetic lineations in plate reconstruction.

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“…Sanbagawa metamorphic ages are taken from Minamishin et al 1979, Suzuki et al 1990 . The K-Ar and Ar-Ar ages refer to Takasugi 1988 andDallmeyer 1990 . Accretionary ages of the Northern Shimanto belt refer to Taira et al 1982 andKiminami et al 1998;1999 .…”

Section: Minawa Formationmentioning

confidence: 99%

“…In the Oboke area, radiometric Ar-Ar whole rock and K-Ar phengite ages of 77 63 Ma have been obtained from the Koboke Formation Itaya and Takasugi, 1988;Takasu and Dallmeyer, 1990 . Thus, the metamorphic age and the tectonic feature of the Shimanto belt in Kii Peninsula are very similar to those of the Oboke area.…”

mentioning

confidence: 99%

Tectonic boundary between the Sanbagawa belt and the Shimanto belt in central Shikoku, Japan

Aoki

Iizuka

Hirata

et al. 2007

Jour. Geol. Soc. Japan

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Mode of occurrence of high-P/T regional metamorphic belt is a key to understand the tectonic evolution of deepseated accretionary complex along the subduction zone.Thermobaric structure of the high-pressure and/or ultrahigh-pressure metamorphic belts have been examined to clarify their exhumation process e.g. Terabayashi et al., 1996;Ota et al., 2000; Correlation with surrounding geologic units is also important to verify the exhumation tectonics, and high-P/T regional metamorphic belts are bounded by a subhorizontal thrust on the bottom and by a subhorizontal normal fault on the top e.g. . It has been well documented from SW Japan

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Space-Time Distribution of Late Mesozoic to Early Cenozoic Magmatism in East Asia and Its Tectonic Implications

Cited by 76 publications

References 11 publications

Geochemistry of Lower Cretaceous sediments, Inner Zone of Southwest Japan. Constraints on provenance and tectonic environment.

Geochemistry of Lower Cretaceous sediments, Inner Zone of Southwest Japan. Constraints on provenance and tectonic environment.

A magnetic anomaly map in the Japanese region with special reference to tectonic implications.

Tectonic boundary between the Sanbagawa belt and the Shimanto belt in central Shikoku, Japan

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