Geochemical diversity of Neogene granitoid plutons in the Izu Collision Zone: implications for transformation of juvenile oceanic arc into mature continental crust

Saito, Satoshi

doi:10.2465/gkk.130902

Cited by 4 publications

(2 citation statements)

References 68 publications

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“…(Takahashi and Saito, 1997). (b) Geological map of the Izu collision zone (modified after Takahashi and Saito, 1997;Saito et al, 2012;Saito, 2014Saito, , 2015 Fujimoto et al, 1965;Yamada et al, 1983;Sato et al, 1989;Ozaki et al, 2002;Saito et al, 2012). Sampling locations are shown together with the results of Al-in-hornblende geobarometry in this study (Mutch et al, 2016) (Table 1).…”

Section: The Kaikomagatake Plutonmentioning

confidence: 85%

Estimation of emplacement depth for the Miocene Kaikomagatake granitoid pluton: constraints on crustal denudation history of the Izu collision zone

Watanabe¹,

Saito

Tani

2020

Journal of Mineralogical and Petrological Sciences

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The Miocene Kaikomagatake pluton is one of the Neogene granitoid plutons exposed at the northern end of the Akaishi Range of the Izu collision zone, where the Izu-Bonin oceanic arc is colliding against the Honshu arc. The pluton intrudes discordantly into the Shimanto accretionary complex of the Honshu arc along the Itoigawa-Shizuoka Tectonic Line that marks the collision boundary. We applied Al-in-hornblende geobarometers to constrain the emplacement depth of the Kaikomagatake pluton. A recently proposed geobarometer suitable for relatively shallow granitoid magmas yielded 2.4-2.2 kbar at temperatures close to the water-saturated granite solidus, which corresponds to upper to middle crustal depths (~9-8 km). Using previously reported thermochronological data, we estimated the post-emplacement cooling rate at~66-156°C/m.y. for the pluton. The estimated cooling rate is lower than that reported for other granitoid plutons in the accreted Izu-Bonin arc, such as the Tanzawa plutonic complex and the Tsuburai pluton. The early stage of the collision between the Izu-Bonin and the Honshu arcs contributed little to denudation of the Honshu arc crust at the Kaikomagatake pluton area.

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Section: The Kaikomagatake Plutonmentioning

confidence: 85%

Estimation of emplacement depth for the Miocene Kaikomagatake granitoid pluton: constraints on crustal denudation history of the Izu collision zone

Watanabe¹,

Saito

Tani

2020

Journal of Mineralogical and Petrological Sciences

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“…Data from Tsuchiya and Kanisawa (1984), Imaoka et al (2014), Tsuchiya et al (2007), etc. The shaded bands show the compositional range of the felsic to intermediate rocks from representative arcs in the world including Aleutian, Mariana, Solomon, Sangihe, South Sandwich, Kermadec and Lesser Antile arcs (afterSaito, 2014). Normalizing values are fromSun and McDonough (1989).…”

mentioning

confidence: 99%

Granites of Japan:

Nakajima

2018

Jour. Geol. Soc. Japan

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All the granitoids in the Japanese Islands are Phanerozoic and of arc-type. They are part of the Late Mesozoic Circum-Pacific granite superprovince. Most of the Japanese granitoids were formed when the Japanese Islands belonged to the Eurasian continent, as the growing front of the continent. They are mostly of I-type, and S-type granitoids are very small in amount. The origin of these granitoids is mostly partial melt of mantle-derived mafic lower crust of arc without an involvement of ancient cratons or their derivatives.The granitic magmatism was quite episodic. % of their surface exposure area is occupied with -Ma, Paleogene to Cretaceous granitoids. In Southwest Japan, they constitute three arc-parallel granitic provinces called Ryoke, San-yo and San-in belts. A transect from the Ryoke to San-yo belt represents the hypothetical crustal cross section of the Cretaceous Eurasian continental margin. The Hidaka belt in Hokkaido is another example of a crustal cross section, exposing the deep Kuril arc at Miocene. On the fore-arc side of the Southwest Japan, -Ma, Middle Miocene granitic rocks are exposed sporadically but widely. The magmatism was very short-lived, supposed to be generated in an unusual tectonic setting related to back-arc opening and incipient subduction of the Philippine Sea plate. Middle Miocene and still younger granitoids are exposed in the Izu Collision Zone. The Quaternary granitoids of ~ Ma are exposed at the Central Highlands in central Japan. Jurassic and Triassic granitoids occur in the Hida belt, which is the most back-arc side unit of the Japanese Islands. Paleozoic granitoids are rare. They are exposed as geologically isolated small bodies or tectonic blocks.

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Transformation of juvenile Izu–Bonin–Mariana oceanic arc into mature continental crust: An example from the Neogene Izu collision zone granitoid plutons, Central Japan

Saito

Tani

2017

Lithos

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Geochemical diversity of Neogene granitoid plutons in the Izu Collision Zone: implications for transformation of juvenile oceanic arc into mature continental crust

Cited by 4 publications

References 68 publications

Estimation of emplacement depth for the Miocene Kaikomagatake granitoid pluton: constraints on crustal denudation history of the Izu collision zone

Estimation of emplacement depth for the Miocene Kaikomagatake granitoid pluton: constraints on crustal denudation history of the Izu collision zone

Granites of Japan:

Transformation of juvenile Izu–Bonin–Mariana oceanic arc into mature continental crust: An example from the Neogene Izu collision zone granitoid plutons, Central Japan

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