NdSr isotopic and geochemical characteristics of two contrasting types of calc-alkaline plutons in the Hida belt, Japan

Arakawa, Yoji; Shinmura, Taro

doi:10.1016/0009-2541(95)00012-b

Cited by 37 publications

(35 citation statements)

References 41 publications

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“…High-Sr and low-Y rocks have been reported in the Hida granitoids by Tsusue et al (1990), Tanaka (1992), Shinmura (1995), andIshihara (2005). If these chemical data are classified by Sr/Y ratio at 22, the Jecheon pluton is composed of 93 % adakite by number of chemical analyses (n=14).…”

Section: Adakitic Signatures and Comparison To The Hida Massifmentioning

confidence: 93%

“…55, no. 4, 2005 Adakitic Granitoids from Non-island-arc Setting, Korea 393 Tanaka (1992), Arakawa and Shinmura (1995) and Ishihara (2005). δ 18 O data of the Hida Type-2 granitoids are of the Utsubo pluton.…”

Section: Origins Of the Triassic-jurassic Granitoidsmentioning

confidence: 99%

“…δ 18 O data of the Hida Type-2 granitoids are of the Utsubo pluton. (Arakawa and Shinmura, 1995;Ishihara, 2005).…”

Section: Origins Of the Triassic-jurassic Granitoidsmentioning

confidence: 99%

“…Adakitic signatures of the Jecheon granitoids are summarized in Table 3, together with those of the Type-2 Hida granitoids (Arakawa and Shinmura, 1995). Granodiorite-granite of the Jecheon pluton is adakitic as shown by the high Sr/Y ratio and low Yb (HREE) contents, except for JE71.…”

Section: Mino-tanba Beltmentioning

confidence: 99%

“…He considered that the former magma generated in the Phanerozoic basaltic crust under island-arc or continental margin setting, whereas the latter magma has two sources, mafic igneous crustal sources of the Phanerozoic and Proterozoic in age. Arakawa and Shinmura (1995) similarly classified the Hida granitoids into Types 1 and 2: Type-1 pluton with a limited variation in the initial Sr and Nd isotopes ( 87 Sr/ 86 Sr 0 =0.7044-0.7054; ε Nd =-0.8 to +5.5), irrespective of the rock compositions, and Type-2 pluton showing a wide range of isotopic values ( 87 Sr/ 86 Sr 0 =0.7055-0.70105; ε Nd =-10.3 to +0.7), which form a linear data array connecting the most primitive gabbro and basement rocks in an ε Nd -87 Sr/ 86 Sr 0 diagram. Thus, Type-1 magma originated in subcontinental mantle and/or mafic lower crust and differentiated by fractional crystallization, then emplaced, but Type-2 magmas required a mixing processes between the parental mafic magma and felsic magmas derived from middle Proterozoic basement crust.…”

Section: Mino-tanba Beltmentioning

confidence: 99%

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Mo-related Adakitic Granitoids from Non-island-arc Setting: Jecheon Pluton of South Korea

2005

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Abstract:The Jecheon granitoids, having an elongated shape of NE-SW 27 km and NW-SE 13 km (190 km 2 ), are composed mostly of magnetite-series hornblende-biotite granodiorite and biotite granite, which intrude into the Neoproterozoic metamorphic and Paleozoic sedimentary rocks of the Ogcheon Belt. The granitoids have Triassic-Jurassic age of 202.7 ± 1.9 Ma with very high 87 Sr/ 86 Sr initial ratio of 0.7140. The granodiorite has 63-69 % SiO 2 , 15.1-17.3 % Al 2 O 3 , <1.6 % MgO, 6-15 ppm Y and Sr/Y ratios of 24-76, and is depleted in HREE. Biotite granite together, the Jecheon pluton has adakitic characteristics, which are unique in a continental tectonic setting. The granitoids may have been generated by partial melting of an older adakitic granitoid of I-type basement, or by separation of early crystallized garnet and hornblende from an anatectic melt.

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Section: Adakitic Signatures and Comparison To The Hida Massifmentioning

confidence: 93%

Section: Origins Of the Triassic-jurassic Granitoidsmentioning

confidence: 99%

“…δ 18 O data of the Hida Type-2 granitoids are of the Utsubo pluton. (Arakawa and Shinmura, 1995;Ishihara, 2005).…”

Section: Origins Of the Triassic-jurassic Granitoidsmentioning

confidence: 99%

Section: Mino-tanba Beltmentioning

confidence: 99%

Section: Mino-tanba Beltmentioning

confidence: 99%