K-Ar ages of the Early Cretaceous Shimonoseki Subgroup and the Kawara Granodiorite, Southwest Japan.

浩久, 松浦

doi:10.2465/ganko.93.307

Cited by 15 publications

(7 citation statements)

References 8 publications

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“…() reported U–Pb ages of 107.9 ± 3 Ma for accidental zircons in the Kusandong Tuff that was erupted at 97 Ma in the Gyeonsang Basin, and suggested that Cretaceous magmatism in and around the Gyeonsang Basin began at approximately 110 Ma. In the western part of SW Japan, Lower Cretaceous andesites, lamprophyres and granitoids have been reported from the Kinki district (109–99 Ma: Matsuura and Yoshikawa, ; Kiji et al ., ; Imaoka et al ., ), and andesites have been also reported from the Chugoku district (107–103 Ma: Imaoka et al ., ; Matsuura, ); it follows, therefore, that magmatism in these districts commenced in the Albian. Taking all these data into consideration, we conclude that Cretaceous magmatism commenced at progressively later dates across the area extending from the Liaodong Peninsula–eastern Jilin Province to SW Japan, i.e.…”

Section: Across‐arc Temporal Variations Of Jurassic–cretaceous Magmatmentioning

confidence: 95%

Spatiotemporal variations of Jurassic–Cretaceous magmatism in easternAsia (Tan‐Lu Fault toSW Japan): evidence for flat‐slab subduction and slab rollback

2013

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Here, we examine spatiotemporal variations of Jurassic-Cretaceous magmatism along a c. 1000-km transect across eastern Asia, including SW Japan, the Korean, Jiaodong and Liaodong peninsulas, and eastern Jilin Province. Integration of tectonic regime data with age data from igneous rocks in eastern Asia (from the Tan-Lu Fault to SW Japan) suggests a shallowing of the subduction angle and subsequent flat-slab subduction during the Jurassic, and slab rollback during the Early Cretaceous. The combination of a subducting plateau and rootenhanced suction provides the best explanation for the flatslab subduction. In the final stage (Albian) of slab rollback, the geotectonic setting changed from subduction-accretion to a continental arc in the area close to the ancient trench (i.e. the Inner Zone of SW Japan).

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Section: Across‐arc Temporal Variations Of Jurassic–cretaceous Magmatmentioning

confidence: 95%

Spatiotemporal variations of Jurassic–Cretaceous magmatism in easternAsia (Tan‐Lu Fault toSW Japan): evidence for flat‐slab subduction and slab rollback

2013

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“…The chondrite-normalized average REE compositions of the potential igneous source rocks discussed above are shown in crops out close to a dated part of the same unit that yielded hornblende K-Ar ages of 105.2 Ma (Imaoka et al, 1993) and 103 Ma (Matsuura, 1998 that fill caldera and cauldron structures occur in the Sanyo and Sanin belts within the Chugoku area of Southwest Japan (Figure 1; Imaoka, Ohira, Sawada, & Itaya, 1994;Kishi, Imaoka, Kochihira, Nishimura, & Itaya, 2007;Terakado & Nohda, 1993;Yamamoto, 2003;Yoshida, Takahashi, & Imaoka, 2009) and in the Nohi Rhyolite of central Japan (Sonehara & Harayama, 2007;Yamada & Koido, 2005). In addition, the Ryoke, Sanyo, and Sanin belts were intruded by granites at 95-60 Ma (Iida et al, 2015;Iijima, Sawada, Sakiyama, & Imaoka, 1985;Kagami, Iizumi, Tainosho, & Owada, 1992), potentially providing another source of zircons for the KS2 sandstone.…”

Section: Temporal Variations In Provenance During Cretaceousmentioning

confidence: 65%

“…Sagong, Kwon, and Ree () suggested that Mesozoic magmatism and the formation of granitoid batholiths in the Korean Peninsula occurred during the Triassic (248–210 Ma) and Early Jurassic (197–158 Ma), forming more potential sources for the zircons within the KS1 sandstone. In addition, late Early Cretaceous zircons were derived from 105 Ma to 103 Ma andesitic to dacitic volcanic rocks (Imaoka, Nakajima, & Itaya, ; Matsuura, ) and from the 110–100 Ma Ryoke metamorphic rocks (Iizumi, Imaoka, & Kagami, ; Nakajima, Shirahase, & Shibata, ; Suzuki & Adachi, ).…”

Section: Discussionmentioning

confidence: 99%

“…The interpretation of FT ages from low-grade metamorphosed accretionary complexes requires information on the peak temperature FIGURE 12 Stratigraphic summary of detrital zircon U-Pb and mudstone radiolarian ages. Ages of igneous activity are generally based on Imaoka et al (1993) and Matsuura (1998) for Early Cretaceous volcanic rocks, Nishida et al (2005) and Yamamoto (2003) for Late Cretaceous volcanic rocks, Iizumi, Imaoka, and Kagami (2000) and Suzuki and Adachi (1998) for the Ryoke metamorphic rocks, and Iida et al (2015) and Imaoka et al (2011) for Late Cretaceous to Paleogene granitic rocks in the study area. Depositional ages of the Monobegawa, Nankai, and Izumi groups are based on Kozai, Ishida, Hirsch, Park, and Chang (2005), Matsukawa and Obata (2015), and Hashimoto et al (2015), respectively.…”

Section: Interpretation Of Fission-track and K-ar Ages For Low-gradmentioning

confidence: 99%

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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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“…They intruded metamorphic rocks of the Renge, Suo, Ryoke, and Higo belts, and sedimentary rocks of the Cretaceous Kanmon Group. Cretaceous andesites and dacite occur in and around Kyushu (Imaoka et al, 1993;Matsuura, 1998;Owada et al, 1999).…”

Section: Geological Backgroundmentioning

confidence: 99%

Secular Variation of Early Cretaceous Granitoids in Kyushu, SW Japan: The Role of Mélange Rocks as a Possible Magma Source

Suga

Yeh

2020

Front. Earth Sci.

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The Early Cretaceous volcanic-arc granitic rocks from Kyushu, SW Japan are contemporaneous with the granitic rocks of the Yanshan Orogeny (SE China) along the eastern Eurasian continental margin. The secular geochemical variations of the wholerock major elemental and Sr-Nd isotope data of the Early Cretaceous granitic rocks from Kyushu, SW Japan, as well as the zircon and apatite saturation temperatures, shows distinct changes during the Albian (∼115 to ∼100 Ma) as: (1) the mASI value of the rocks (i.e., Shiraishino granodiorites) decreases below 1, (2) the Sr-Nd isotopic data are relatively constant [ 87 Sr/ 86 Sr i = 0.70471 to 0.70573; ε Nd (t) = + 0.2 to + 1.9] within different rock types including granites, granodiorites, tonalites, and adakitic rocks (i.e., the Shiraishino granodiorites), following the increase of 87 Sr/ 86 Sr i and decrease of ε Nd (t) from Berriasian, and (3) higher maximum temperatures at ∼105 Ma. The secular changes indicate that important geodynamic changes occurred in the arc system of SW Japan as it changed from subduction-accretion during the Jurassic to continental arc during the Early Cretaceous. Thermodynamic partial melting modeling demonstrates that the Albian granitic rocks can be derived from mélange rocks, such as chloriteactinolite schists, at moderate depth and variable redox conditions. It is concluded that the genesis of the Early Cretaceous granitic rocks from Kyushu, SW Japan, may be related to upwelling of the asthenosphere and hot corner flow into the mantle wedge caused by slab rollback, which followed a shallowing of the subduction angle and subsequent flat-slab subduction during the Late Jurassic. The resultant heat induced the partial melting of the mélange rocks that formed on and were transported from the subducted plate interface.

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K-Ar ages of the Early Cretaceous Shimonoseki Subgroup and the Kawara Granodiorite, Southwest Japan.

Cited by 15 publications

References 8 publications

Spatiotemporal variations of Jurassic–Cretaceous magmatism in easternAsia (Tan‐Lu Fault toSW Japan): evidence for flat‐slab subduction and slab rollback

Spatiotemporal variations of Jurassic–Cretaceous magmatism in easternAsia (Tan‐Lu Fault toSW Japan): evidence for flat‐slab subduction and slab rollback

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

Secular Variation of Early Cretaceous Granitoids in Kyushu, SW Japan: The Role of Mélange Rocks as a Possible Magma Source

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