ジルコンU-Pb年代からみた富山県北東部白亜系陸成層の再定義

Takeuchi, Makoto; Ohkawa, Masahiro; Kawahara, Kentaro; Tomita, Satoru; Yokota, Hiro-omi; Tokiwa, Tetsuya; Furukawa, Ryuta

doi:10.5575/geosoc.2014.0046

Cited by 22 publications

(8 citation statements)

References 18 publications

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“…, Aoki et al, 2007;, 2010;, 2015 9 km 12 km U-Pb , 1994;, 1996, 1996, 2005 Kurimoto, 1994; , 1996 , 1979;, 1981;Kumon, 1983;, 1998;, 200080-100 Ma , Nakajima et al, 2016Sato et al, 2016, Shibata et al, 2008 100 Ma Tokiwa et al , 2006Tokiwa et al , 2012bTokiwa et al , 1991Tokiwa et al , 2006 , 2006, 2012c U-Pb Tokiwa et al 2017 1992 , 1981, 1989, 1992; , 1996 , 2012; , 2015 Group, 1991Group, , 2006Group, , 2012bGroup, , 2012cYamamoto and Suzuki, 2012;Yamato Omine Research Group, 1981, 1989 …”

Section: La-icp-ms U-pbmentioning

confidence: 99%

Geology and detrital zircon U-Pb age of the Cretaceous Mugitani Formation in the Shimanto Belt, central Kii Peninsula, Southwest Japan

Shimura

Tokiwa

Takeuchi

et al. 2017

Jour. Geol. Soc. Japan

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We have investigated the Mugitani Formation located in the structurally upper part of the Cretaceous accretionary complex in the Shimanto Belt, central Kii Peninsula. The Mugitani Formation is newly divided into two units: the Izuo Unit and the Sebato Unit. The Izuo Unit is composed mainly of mudstone, broken beds of sandstone and mudstone, and mixed rock with minor amounts of sandstone and chert. The Sebato Unit is composed mainly of mudstone with minor amounts of broken beds of sandstone and mudstone, basalt, and mixed rock. The bedding planes generally strike WNW-ESE and dip moderately northward. In addition, we also carried out UPb dating of detrital zircons separated from three sandstones to clarify the depositional age of the Mugitani Formation. The youngest zircon grain ages and/or the youngest cluster ages indicate ca.Ma, presenting latest Early Cretaceous (Albian). Furthermore, we found no Late Cretaceous zircon grains that are known to have been produced by the intensive igneous activity in Southwest Japan. Based on the youngest zircon grain ages, the youngest cluster ages, and age compositions, the depositional age of the Mugitani Formation corresponds to that of the Yukawa Formation, ranging from Albian to Cenomanian.

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Section: La-icp-ms U-pbmentioning

confidence: 99%

Geology and detrital zircon U-Pb age of the Cretaceous Mugitani Formation in the Shimanto Belt, central Kii Peninsula, Southwest Japan

Shimura

Tokiwa

Takeuchi

et al. 2017

Jour. Geol. Soc. Japan

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“…The oldest zircon from Japan occurs as a xenocryst in the Permian granitoids in the Hida belt, Southwest Japan (Horie et al, ), of which U–Pb age is dated at 3.8 Ga (Eoarchean), almost close to that of the oldest rock of the planet (4.0 Ga gneisses from Canada; Bowring & Williams, ). Archean zircons were identified not merely other Paleozoic granitoids and gneisses but also in Paleozoic and early Mesozoic sandstones both in Southwest and Northeast Japan (Aoki et al, ; Isozaki et al, ; Okawa et al, ; Shimojo et al, ; Takeuchi et al, ; Watanabe et al, ; Yoshimoto et al, ).…”

Section: Precambrian Zirconsmentioning

confidence: 99%

A visage of early Paleozoic Japan: Geotectonic and paleobiogeographical significance of Greater South China

Isozaki

2019

Island Arc

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The current state of knowledge on the early Paleozoic evolution of Japan is reviewed. Although early Paleozoic Japan marked the foundation of long‐lasting subduction‐related orogenic growth throughout the Phanerozoic, details of this have not been fully revealed. Nevertheless, U‐Pb dating of zircons both in Paleozoic granitoids and sandstones is revealing several new aspects of early Paleozoic Japan. The timing of the major tectonic change, from a passive continental margin setting (Stage I) to an active one (Stage II), was constrained to the Cambrian by identifying the oldest arc granitoid, high‐P/T blueschist, and terrigenous clastics of arc‐related basins. Ages of recycled zircons in granitoids and sandstones provided critical information on the homeland of Japan, i.e. the continental margin along which proto‐Japan began to grow. The early Paleozoic continental margin that hosted the development of an arc‐trench system in proto‐Japan had cratonic basement composed mostly of Proterozoic crust with a minor Archean component. The predominant occurrence of Neoproterozoic zircons in Paleozoic rocks, as xenocrysts in arc granitoids and also as detrital grains in terrigenous clastics, indicates that the relevant continental block was a part of South China, probably forming a northeastern segment of Greater South China (GSC) together with the Khanka/Jiamsi/Bureya mega‐block in Far East Asia. GSC was probably twice as large as the present conterminous South China on mainland Asia. Paleozoic Japan formed a segment of a mature arc‐trench system along the Pacific side of GSC, where the N–S‐trending Pacific‐rim orogenic belt (Nipponides) developed with an almost perpendicular relationship with the E–W‐trending Central Asian orogenic belt. The faunal characteristics of the Permian marine fauna in Japan, both with the Tethyan and Boreal elements, can be better explained than before in good accordance with the relative position of GSC with respect to the North China block during the late Paleozoic.

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“…Red dots and corresponding letters indicate localities where the clast compositions of conglomerates have been determined (Fig. 7) 10 , 1990, 19971984198519851985Takeuchi et al 200820024 Sato 195519311955195619561957 1957 Takeuchi et al, 2015). In estimating the depositional ages of these sediments, we have given precedence to evidence from fossils over radiometric age data.…”

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confidence: 99%

“…2 and 3 1918, , 1969, 19821997, 1998, 1999 Takeuchi et al (2015). Red dots and corresponding letters indicate localities where the clast compositions of conglomerates have been determined (Fig.…”

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confidence: 99%