Timing of the Late Cretaceous ignimbrite flare-up at the eastern margin of the Eurasian Plate: New zircon U–Pb ages from the Aioi–Arima–Koto region of SW Japan

Sato, Daisuke; Matsuura, Hirohisa; Yamamoto, Takahiro

doi:10.1016/j.jvolgeores.2015.11.014

Cited by 47 publications

(23 citation statements)

References 37 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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“…115–70 Ma) in the inner zone of southwest Japan during the Late Cretaceous (e.g. Iida et al, ; Miyazaki et al, ; Noda & Sato, ; Sato, ; Sato, Matsuura, & Yamamoto, ). Large amounts of igneous zircon would have been supplied from the felsic volcanic fields, as a result of the frequent caldera‐forming ignimbrite eruptions during 90–70 Ma (Sato, ; Sato et al, ), and the trench‐fill sediments should contain these zircons.…”

Section: Discussionmentioning

confidence: 99%

Timescale of material circulation in subduction zone: U–Pb zircon and K–Ar phengite double‐dating of the Sanbagawa metamorphic complex in the Ikeda district, central Shikoku, southwest Japan

Nagata

Miyazaki

Iwano³

et al. 2019

Island Arc

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We have estimated the timescale of material circulation in the Sanbagawa subduction zone based on U–Pb zircon and K–Ar phengite dating in the Ikeda district, central Shikoku. The Minawa and Koboke units are major constituents of the high‐P Sanbagawa metamorphic complex in Shikoku, southwest Japan. For the Minawa unit, ages of 92–81 Ma for the trench‐fill sediments, are indicated, whereas the age of ductile deformation and metamorphism of garnet and chlorite zones are 74–72 Ma and 65 Ma, respectively. Our results and occurrence of c. 150 Ma Besshi‐type deposits formed at mid‐ocean ridge suggest that the 60‐Myr‐old Izanagi Plate was subducted beneath the Eurasian Plate at c. 90 Ma, and this observation is consistent with recent plate reconstructions. For the Koboke unit, the depositional ages of the trench‐fill sediments and the dates for the termination of ductile deformation and metamorphism are estimated at c. 76–74 and 64–62 Ma, respectively. In the Ikeda district, the depositional ages generally become younger towards lower structural levels in the Sanbagawa metamorphic complex. Our results of U–Pb and K–Ar dating show that the circulation of material from the deposition of the Minawa and Koboke units at the trench through an active high‐P metamorphic domain to the final exhumation from the domain occurred continuously throughout c. 30 Myr (from c. 90 to 60 Ma).

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“…It means that the dates obtained from the zircon grains in the tuff beds do not indicate the depositional age directly. However, based on the very thick sediments in the Takikubo Formation (Noda et al, in press) and high productivity of pyroclastic detritus in the Sanyo Belt during this time (Sato et al, 2016a), it is probable that the zircon grains were transported from the source and deposited in the basin without a large time lag after the crystallization. Therefore, we approximate the depositional age of the Minoura Sandstone and Mudstone Member to 78.3±0.5 Ma (2σ) of the concordia ages or 78.2±0.5 Ma (2σ) of the weighted mean of 206 Pb * / 238 U ages for the younger cluster in KT01, which corresponds to middle Middle Campanian and the polarity chron C33n in the magnetostratigraphy (Gradstein et al, 2012).…”

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confidence: 96%

LA-ICP-MS U–Pb and fission-track ages of felsic tuff beds of the Takikubo Formation, Izumi Group in the Kan-onji district, eastern Shikoku, southwestern Japan

Noda

Danhara²,

Iwano³

et al. 2017

Bull. Geol. Surv. Japan

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LA-ICP-MS U-Pb and fission-track (FT) dating were performed for detrital zircons in two felsic tuff samples (KT01 and KT02) in order to estimate the depositional age of the Takikubo Formation (Izumi Group) in the Kan-onji district, eastern Shikoku, southwestern Japan. Total 30 grains analyzed for each sample indicated that the U-Pb ages composed of multiple populations chiefly of younger (75-85 Ma) and older (85-95 Ma) clusters. The concordia ages calculated by grains in the younger clusters were 78.3±0.5 Ma (2σ) for KT01 (number of accepted grains n = 23) and 80.8±0.7 Ma (2σ) for KT02 (n = 9). The U-Pb ages of KT01 are comparable with 79±7 Ma (2σ) of the FT age from the same sample. The U-Pb ages of KT01 could constrain the maximum depositional age near the basal part of the Takikubo Formation, which was middle of the Middle Campanian (polarity chron C33n in the magnetostratigraphy).Keywords: Campanian, Cretaceous, Felsic tuff, Fission-track age, Izumi Group, Shikoku, Takikubo Formation, U-Pb age IntroductionThe Izumi Group is forearc basin deposits of the Late Cretaceous, which is narrowly distributed from western Shikoku to the Kii Peninsula along the northern side of the Median Tectonic Line. Macro-fossils (ammonoids and inoceramids) and micro-fossils (radiolarian assemblages) show that the depositional age of the Izumi Group are Campanian to Maastrichtian, Late Cretaceous (Suyari, 1973;Bando and Hashimoto, 1984;Yamasaki, 1987;Hashimoto et al., 2015). Those paleontological studies indicate that the depositional ages are younging toward the east. On the other hand, the paleocurrent directions in the main facies suggest the sediment derivation was mainly from east-northeast to west-southwest (Suyari, 1973;Miyata, 2004), as opposed to the younging direction of the depositional ages. These facts imply that the sedimentary basin of the Izumi Group had been developed in association with strike-slip fault activities (Ichikawa et al., 1981;Miyata, 1989;Noda and Toshimitsu, 2009). Progressive fault displacements along the pull-apart basins could migrate the basin depocenters (e.g., Noda, 2013).Recently, details of the Late Cretaceous volcanic activities in the Sanyo Belt, which is situated at the north of the Izumi Group, were revealed by using U-Pb ages of igneous zircon grains in the felsic volcanic rocks and welded tuff beds (Sato, 2016; Sato et al., 2016a, b) (Fig. 1A). Therefore, radioisotope geochronological data in the Izumi Group may be useful to compare with the volcanic activities in magmatic fronts and to discuss temporal and spatial evolution of the sedimentary basin during the Late Cretaceous time. Although there are a few fission-track ages reported from the Izumi Group of Shikoku Island and the Kii Peninsula (Fig. 1A), no FT and U-Pb age data have been reported from eastern Shikoku to date. This paper reports LA-ICP-MS U-Pb and FT ages of zircons in two felsic tuff beds of the Takikubo Formation (Yamasaki, 1986;Matsuura et al., 2002), which is the lower most formation of the main facies ...

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Timing of the Late Cretaceous ignimbrite flare-up at the eastern margin of the Eurasian Plate: New zircon U–Pb ages from the Aioi–Arima–Koto region of SW Japan

Cited by 47 publications

References 37 publications

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

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

Timescale of material circulation in subduction zone: U–Pb zircon and K–Ar phengite double‐dating of the Sanbagawa metamorphic complex in the Ikeda district, central Shikoku, southwest Japan

LA-ICP-MS U–Pb and fission-track ages of felsic tuff beds of the Takikubo Formation, Izumi Group in the Kan-onji district, eastern Shikoku, southwestern Japan

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