The Ashizuri granite-alkaline gabbro complex in the forearc of a Paleogene accretionary complex, Shikoku, Japan: Constraints on evolution by zircon U-Pb age and trace element composition

Matsumoto, Takumi; Aoki, Kazumasa; Windley, Brian F.; Aoki, Shogo

doi:10.2343/geochemj.2.0611

Cited by 8 publications

(8 citation statements)

References 40 publications

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“…Some Ashizuri granitoids plotted within the MORB–OIB array in the crossplot proposed by Pearce (2008) (Figure S1d). As discussed in previous studies (Matsumoto et al, 2020; Stein et al, 1996), the Ashizuri granitic magma may have been derived by fractionation from an OIB‐type magma.…”

Section: Discussionmentioning

confidence: 71%

“…Sawaki et al (2017) did not report any inherited cores within zircons taken from Ashizuri granitoids. All U–Pb ages of euhedral zircons taken from these granitoids show zircon crystallization during the Miocene epoch (Matsumoto et al, 2020; Shinjoe et al, 2010). As such, we did not monitor the 206 Pb in our analysis of the Ashizuri zircons (Table S3).…”

Section: Methodsmentioning

confidence: 99%

“…The stages are characterized by different lithologies (e.g., Murakami & Imaoka, 1985), namely coarse‐grained quartz syenite (stage I); melanocratic syenite, quartz syenite, and alkali granite (stage II); coarse‐grained quartz syenite and Rapakivi granite (stage III); coarse‐grained biotite granite (stage IV); aplite, leucocratic granite, granite porphyry (stage IV); and alkali dolerite and quartz syenite (stage V). The weighted‐mean U–Pb ages of zircons taken from the granitoids are in the range of ~14–13 Ma (Matsumoto et al, 2020; Shinjoe et al, 2010).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Zircon trace‐element compositions in Miocene granitoids in Japan: Discrimination diagrams for zircons in M‐, I‐, S‐, and A‐type granites

et al. 2022

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Detrital zircons demonstrate high resistance to alteration and, as such retain information about their formation ages and parental magmas for a long period of time.Geochemical researchers have proposed a wide variety of discrimination diagrams applicable to detrital zircons. In our research, we focused on the conventional classification scheme for granites (Mantle, M; Igneous, I; Sedimentary, S; and Alkaline, A types) and sought to characterize zircon trace-element compositions that are sensitive to differences among these granite types. To accomplish this, we examined trace-element compositions of zircons extracted from granitoids in the Ohmine granitic rocks and the Ashizuri plutonic complex in southwestern Japan.The zircons showed systematic differences in Nb/P, Ta/P, Ce/P, Ce/Nd, Y/P, Th/U, and Sc/Yb ratios and the Eu anomaly. Zircons in A-type granite are rich in Nb, Ta, Ce, and Y, and their signatures clearly reflect those elements in their parental bodies. Sc/Yb ratios of zircons in A-type granites are <0.1, which is similar to those of ocean-island-type zircons. Despite their high abundance at the wholerock level, zircons in S-type granite are characterized by low Nb/P, Ta/P, and Th/U ratios. This is attributable to the depletion of Nb, Ta, and Th in the magma by ilmenite and monazite prior to zircon crystallization. In general, S-type granitic magmas exhibit reducing environments, which decrease the proportions of Ce 4+ and Eu 3+ . These effects lead to a low Ce/Nd ratio and a large negative Eu anomaly in S-type zircons. On the basis of these findings, we recommend the combined use of Nb/P-Ce/P or Ta/P-Ce/P crossplots and of Sc/Yb ratios to discriminate zircons in M-, I-, S-, and A-type granites. Although the crossplots are created using data from Miocene granitoids in Japan, the discrimination diagrams are based on the general features of each type of granite.

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Section: Discussionmentioning

confidence: 71%

Section: Methodsmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

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Zircon trace‐element compositions in Miocene granitoids in Japan: Discrimination diagrams for zircons in M‐, I‐, S‐, and A‐type granites

et al. 2022

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“…The Miocene Ashizuri granite‐alkaline gabbro complex (Figure 1c) is mainly composed of A‐type granite that intruded into the Paleogene Shimizu Formation (Kawano & Ueda, 1966; Kimura et al, 2005; Matsumoto et al, 2020; Murakami et al, 1983; Sawaki et al, 2017; Shinjoe et al, 2010, 2019). Subsequent thermal events including metamorphism and magmatic activity, have less influence on this complex.…”

Section: Methodsmentioning

confidence: 99%

“…The zircons showed oscillatory zoned textures based on internal monochromatic CL images (Figure 2e,f). Although some zircons have a resorption domain that crosses some of the initial oscillatory zones, this domain was generated during a brief early magmatic event (Hayashi & Akai, 2011; Matsumoto et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

Pressure effect on cathodoluminescence emission intensity recorded in metamorphosed detrital zircons of the Sanbagawa schists

Tsuchiya¹,

Aoki

Kogiso

et al. 2022

Island Arc

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The cathodoluminescence (CL) emission and spectra analyses were conducted on detrital zircons in the Cretaceous Sanbagawa schists to describe changes in CL properties of zircons associated with metamorphism. In addition, high‐pressure (HP) and high‐temperature (HT) experiments were conducted on the non‐metamorphosed Miocene Ashizuri igneous zircons, and the CL emission intensities obtained from them were compared with those of the Sanbagawa zircons. As a result, as compared to low‐grade Sanbagawa zircons, the emission intensities of the high‐grade Sanbagawa zircons reduced. The emission intensities produced from the HP‐treated Ashizuri zircons, on the other hand, were twice as high as those generated from untreated zircons, but less than half of those generated from HT‐treated zircons. Combining our results with previous studies on the temperature influence on zircon CL properties, it indicates that increasing metamorphic pressure decreases the increase in the CL emission intensity of metamorphosed detrital zircons resulting from the increasing temperature. The pressure effect on the emission intensity of zircon during metamorphism might be larger than the temperature effect.

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Provenance of granitic gravestones in graveyard of feudal lords evaluated by multiple non-destructive rock analyses

Tanikawa

Tokuyama²,

Mochizuki³

et al. 2022

Journal of Cultural Heritage

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The Ashizuri granite-alkaline gabbro complex in the forearc of a Paleogene accretionary complex, Shikoku, Japan: Constraints on evolution by zircon U-Pb age and trace element composition

Cited by 8 publications

References 40 publications

Zircon trace‐element compositions in Miocene granitoids in Japan: Discrimination diagrams for zircons in M‐, I‐, S‐, and A‐type granites

Zircon trace‐element compositions in Miocene granitoids in Japan: Discrimination diagrams for zircons in M‐, I‐, S‐, and A‐type granites

Pressure effect on cathodoluminescence emission intensity recorded in metamorphosed detrital zircons of the Sanbagawa schists

Provenance of granitic gravestones in graveyard of feudal lords evaluated by multiple non-destructive rock analyses

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