Cooling history of the Takahama Granitic Rocks, Shikoku, Ryoke Belt, Southwest Japan, with special reference to the thermal effect of the Neogene intrusive rocks.

Umeda, Koji; Komatsu, Ryo; Tanase, Atsushi; Yusa, Yasuhisa

doi:10.2465/gkk.30.17

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…There has been a lot of discussion about cooling rate and uplift history of granitic bodies based on thermochronology (e.g. Dodson and McClelland 1985;Hurford 1986;Yuhara and Kagami 1995;Tsuchiya and Fujino 2000;Umeda et al 2001;Zhao et al 2004). However, there have been few attempts to clarify the three-dimensional cooling pattern of an individual pluton.…”

Section: Introductionmentioning

confidence: 99%

Thermochronology and the three-dimensional cooling pattern of a granitic pluton: an example from the Toki granite, Central Japan

Yuguchi

Amano

Tsuruta

et al. 2011

Contrib Mineral Petrol

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The three dimensional spatial variations in the cooling pattern of the Toki granitic body, a zoned pluton in Central Japan, have been evaluated quantitatively by thermochronology using cooling age determination based on the different closure temperatures for target mineral species. The Toki granite has hornblende K-Ar ages of about 74.3±3.7 Ma (n = 2; closure temperature of 510±25 o C), biotite K-Ar ages of 78.5±3.9 to 59.7±1.5 Ma (n = 33; 300±50 o C), and zircon fission-track ages of 75.6 ±3.3 to 52.8±2.6 Ma (n = 44; 240±50 o C).The spatial variation in the biotite K-Ar age is similar to that in the zircon fission-track age in samples collected from 11 boreholes and seven outcrop sites in the Toki granite, indicating that cooling was effectively from the roof and also from the northwest margin. This cooling pattern shows a strong correlation with the Alumina Saturation Index (ASI) distribution of the body.Larger ASI values correspond to earlier and more rapid cooling after emplacement and smaller value to slower cooling. Toki granite was effectively cooled from the peraluminous regions where assimilation of country sedimentary rock was most extensive.

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Section: Introductionmentioning

confidence: 99%

Thermochronology and the three-dimensional cooling pattern of a granitic pluton: an example from the Toki granite, Central Japan

Yuguchi

Amano

Tsuruta

et al. 2011

Contrib Mineral Petrol

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“…Abbreviations for stratigraphy: Coniac., Coniacian; Sant., Santonian. References for radiometric age data: [1] Aoki et al (), [2] Imaoka, Nakajima, and Itaya (), [3] Takagi et al (), [4] Takagi et al (), [5] Takagi, Soda, and Yoshimura (), [6] Kishi et al (), [7] Imaoka et al (), [8] Imaoka and Ikawa (), [9] Imaoka et al (), [10] Yuge, Imaoka, and Iizumi (), [11] Ikawa et al (), [12] Suzuki, Adachi, and Nureki (), [13] Suzuki and Adachi (), [14] Suzuki, Adachi, and Kajizuka (), [15] Umeda et al (), [16] Tazaki et al (), [17] Kagami et al (), [18] T. Sato et al (), [19] Aoki et al (), [20] Nakahata, Isozaki, and Tsutsumi (), [21] Sonehara and Yagi (), [22] Matsumoto, Sawada, and Kagami (), [23] K. Sato et al (), [24] A. Noda et al (), [25] A. Noda, Danhara, Iwano, and Hirata (2017a), [26] Nakajima et al (), [27] Iida et al (), [28] D. Sato, Matsuura, and Yamamoto (2016a), [29] D. Sato, Yamamoto, and Takagi (2016b), [30] D. Sato (), [31] Terakado and Nohda (), [32] D. Sato (), [33] H. Ito et al (), [34] Miyata (), [35] Shibata and Uchiumi (), [36] Seike et al (), [37] Morioka, Tainosho, and Kagami (), [38] Watanabe et al (), [39] Kawakami and Suzuki (). Detailed version of this figure is presented in supporting information…”

Section: Geological Settingmentioning

confidence: 99%

“…A major metamorphic event occurred during the early Late Cretaceous ( ca 95 Ma; Suzuki & Adachi, ). The metamorphic rocks on western Shikoku Island are intruded by the Ryoke plutonic rocks, which include gneissic granodiorite, tonalite, granite, and diorite (Okudaira et al, ), which yield a Rb–Sr whole‐rock age of ca 93.1 Ma (Kagami et al, ), hornblende K–Ar ages of 86.5–91.1 Ma (Umeda et al, ), and biotite K–Ar ages of 82.2–85.6 Ma (Takami et al, ) (Figures and S1). The granitic rocks are further intruded by many felsic dikes (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

Submarine slope–fan sedimentation in an ancient forearc related to contemporaneous magmatism: The Upper Cretaceous Izumi Group, southwestern Japan

Noda

Sato

2017

Island Arc

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The Izumi Group in southwestern Japan is considered to represent deposits in a forearc basin along an active volcanic arc during the late Late Cretaceous. The group consists mainly of felsic volcanic and plutonic detritus, and overlies a Lower to Upper Cretaceous plutono‐metamorphic complex (the Ryoke complex). In order to reconstruct the depositional environments and constrain the age of deposition, sedimentary facies and U–Pb dating of zircon grains in tuff were studied for a drilled core obtained from the basal part of the Izumi Group. On the basis of the lithofacies associations, the core was subdivided into six units from base to top, as follows: mudstone‐dominated unit nonconformably deposited on the Ryoke granodiorite; tuffaceous mudstone‐dominated unit; tuff unit; tuffaceous sandstone–mudstone unit; sandstone–mudstone unit; and sandstone‐dominated unit. This succession suggests that the depositional system changed from non‐volcanic muddy slope or basin floor, to volcaniclastic sandy submarine fan. Based on a review of published radiometric age data of the surrounding region of the Ryoke complex and the Sanyo Belt which was an active volcanic front during deposition of the Izumi Group, the U–Pb age (82.7 ±0.5 Ma) of zircon grains in the tuff unit corresponds to those of felsic volcanic and pyroclastic rocks in the Sanyo Belt.

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Tectonic setting and formation of the Setouchi volcanic rocks in the western Seto Inland Sea, Japan

Sato

Haji

2021

Island Arc

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The Setouchi volcanic rocks include high-Mg andesites (HMAs) and garnet-bearing dacite-rhyolite, and are sporadically distributed along the Median Tectonic Line, Japan. New U-Pb zircon ages and geological and geochemical data are presented for those rocks in the Western Setouchi region (W-Setouchi). Previous studies referred to the altered andesite in the W-Setouchi as "pre-Setouchi volcanic rocks." However, on the basis of the new U-Pb age (14.4 Ma ± 0.3 Ma) and geochemical characteristics, we redefine it as the Jikamuro Formation, part of the Setouchi volcanic rocks.Incompatible elements are more enriched in the Jikamuro Formation rocks than in the Setouchi HMAs. The characteristic element compositions may be explained by mixing of compositionally different magmas, including subducted sediment melts, plus a contribution from crustal contamination. A stress-inversion technique with Bingham distribution method was applied to the orientations of felsic and mafic dikes within the Setouchi volcanic rocks, and indicates paleo-stress conditions during the period of Setouchi volcanism in the W-Setouchi. The analysis reveals NNWextensional stresses and a strike-slip stress. We infer that the former represents extensional conditions during the main period of volcanism and the latter represents a stress transition during the most recent period of volcanism (after 12 Ma).

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Cooling history of the Takahama Granitic Rocks, Shikoku, Ryoke Belt, Southwest Japan, with special reference to the thermal effect of the Neogene intrusive rocks.

Cited by 6 publications

References 12 publications

Thermochronology and the three-dimensional cooling pattern of a granitic pluton: an example from the Toki granite, Central Japan

Thermochronology and the three-dimensional cooling pattern of a granitic pluton: an example from the Toki granite, Central Japan

Submarine slope–fan sedimentation in an ancient forearc related to contemporaneous magmatism: The Upper Cretaceous Izumi Group, southwestern Japan

Tectonic setting and formation of the Setouchi volcanic rocks in the western Seto Inland Sea, Japan

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