K–Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene–Oligocene thermo-tectonic reactivation

Imaoka, Teruyoshi; Kiminami, Kazuo; Nishida, Keiya; Takemoto, M.; Ikawa, Toshiyuki; Itaya, Tetsumaru; Kagami, Hiroo; Iizumi, Shigeru

doi:10.1016/j.jseaes.2010.10.002

Cited by 61 publications

(39 citation statements)

References 147 publications

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“…In addition, granitic rocks of the San-in belt have similar age and are also interpreted as components of the Shimanto orogenic belt (Iizumi et al, 1985;Nakajima et al, 1990;Kagami et al, 1992Kagami et al, , 1995Osanai et al, 1993;Sawada et al, 1994;Kiji et al, 2000;Nishida et al, 2005;Imaoka et al, 2011). Nishida et al (2005) systematically analyzed Rb-Sr whole-rock isochron age of granitic rocks and associated volcanic rocks in the San-in belt, and demonstrated that these rocks formed in three stages at ca.…”

Section: Shimanto Orogenmentioning

confidence: 99%

Recognition of the Shimanto HP metamorphic belt within the traditional Sanbagawa HP metamorphic belt: New perspectives of the Cretaceous–Paleogene tectonics in Japan

Aoki

Maruyama

Isozaki

et al. 2011

Journal of Asian Earth Sciences

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Section: Shimanto Orogenmentioning

confidence: 99%

Recognition of the Shimanto HP metamorphic belt within the traditional Sanbagawa HP metamorphic belt: New perspectives of the Cretaceous–Paleogene tectonics in Japan

Aoki

Maruyama

Isozaki

et al. 2011

Journal of Asian Earth Sciences

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“…These out‐of‐sequence thrusts developed after the middle Eocene within the Shimanto accretionary complex between Kyushu and Shikoku. In addition, the timing of low‐grade metamorphism during the middle Eocene was coincident with magmatic hiatus of 52–43 Ma within the Sanin belt (Imaoka et al, ) and the accretion of the Eocene Naharigawa unit. Recently, Tonai, Ito, Hashimoto, Tamura, and Tomioka () examined that a seismogenic thrust developed between the Hiwasa unit and the Mugi unit (the Minami‐Awa Fault) was reactivated at 29–23 Ma, based on K–Ar ages of clay fractions from the ultracataclasite in the fault zone.…”

Section: Discussionmentioning

confidence: 98%

Detrital zircon multi‐chronology, provenance, and low‐grade metamorphism of the Cretaceous Shimanto accretionary complex, eastern Shikoku, Southwest Japan: Tectonic evolution in response to igneous activity within a subduction zone

et al. 2017

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Detrital zircon multi‐chronology combined with provenance and low‐grade metamorphism analyses enables the reinterpretation of the tectonic evolution of the Cretaceous Shimanto accretionary complex in Southwest Japan. Detrital zircon U–Pb ages and provenance analysis defines the depositional age of trench‐fill turbidites associated with igneous activity in provenance. Periods of low igneous activity are recorded by youngest single grain zircon U–Pb ages (YSG) that approximate or are older than the depositional ages obtained from radiolarian fossil‐bearing mudstone. Periods of intensive igneous activity recorded by youngest cluster U–Pb ages (YC1σ) that correspond to the younger limits of radiolarian ages. The YC1σ U–Pb ages obtained from sandstones within mélange units provide more accurate younger depositional ages than radiolarian ages derived from mudstone. Determining true depositional ages requires a combination of fossil data, detrital zircon ages, and provenance information. Fission‐track ages using zircons estimated YC1σ U–Pb ages are useful for assessing depositional and annealing ages for the low‐grade metamorphosed accretionary complex. These new dating presented here indicates the following tectonic history of the accretionary wedge. Evolution of the Shimanto accretionary complex from the Albian to the Turonian was caused by the subduction of the Izanagi plate, a process that supplied sediments via the erosion of Permian and Triassic to Early Jurassic granitic rocks and the eruption of minor amounts of Early Cretaceous intermediate volcanic rocks. The complex subsequently underwent intensive igneous activity from the Coniacian to the early Paleocene as a result of the subduction of a hot and young oceanic slab, such as the Kula–Pacific plate. Finally, the major out‐of‐sequence thrusts of the Fukase Fault and the Aki Tectonic Line formed after the middle Eocene, and this reactivation of the Shimanto accretionary complex as a result of the subduction of the Pacific plate.

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“…한편 화강암질 마그마로 염기 성 마그마가 주입되어 발생하는 다양한 마그마 혼합 의 양상은 상부 맨틀로부터 지각에 직접적인 물질 의 주입을 지시하므로, 해령섭입에 따른 섭입판의 열개(slab window) 현상을 반영할 가능성 높다 (Thorkelson, 1996;Osozawa, 1997;Kinoshita, 1999Kinoshita, , 2002Madsen et al, 2006;McCrory and Wilson, 2009). 또한 슬랩 윈도우의 대륙 연변부 상부에는 고-Mg 안산암과 데사이트(아다카이트)가 분출하는데 (Kay et al 1993;Thorkelson and Breitsprecher, 2005;Guo et al, 2007;Imaoka et al, 2011) (Fig. 3).…”

Section: 지화학적 특징unclassified

Cretaceous to Early Tertiary Granites and Magma Mixing in South Korea : Their Spatio-temporal Variations and Tectonic Implications (Multiple Slab Window Model)

Kim¹,

Kim²,

Jwa³

et al. 2012

The Journal of the Petrological Society of Korea

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Based on the petrologic and age data of the Cretaceous to early Tertiary granites in south Korea, we propose a new tectonic model reflecting their temporal and spatial variations. A number of petrographic and geochemical studies on the granites suggest that they originated from the magma formed by subduction of oceanic crust in continental margin and were emplaced in epizone. The MMEs with various shapes and sizes, which were produced due to the magma mixing caused by the injection of mafic magma from mantle during the crystallization of the granitic magma, are observed in the granites. The distributions of the MMEs and ages of the granites show a distinctive spatio-temporal distribution pattern. The distribution pattern can be explained by a multiple slab window model related to the ridge subduction of Izanagi-Pacific plates during the Late Cretaceous.

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K–Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene–Oligocene thermo-tectonic reactivation

Cited by 61 publications

References 147 publications

Recognition of the Shimanto HP metamorphic belt within the traditional Sanbagawa HP metamorphic belt: New perspectives of the Cretaceous–Paleogene tectonics in Japan

Recognition of the Shimanto HP metamorphic belt within the traditional Sanbagawa HP metamorphic belt: New perspectives of the Cretaceous–Paleogene tectonics in Japan

Detrital zircon multi‐chronology, provenance, and low‐grade metamorphism of the Cretaceous Shimanto accretionary complex, eastern Shikoku, Southwest Japan: Tectonic evolution in response to igneous activity within a subduction zone

Cretaceous to Early Tertiary Granites and Magma Mixing in South Korea : Their Spatio-temporal Variations and Tectonic Implications (Multiple Slab Window Model)

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