Island Arc

Cover image for Vol. 26 Issue 6

Early View (Online Version of Record published before inclusion in an issue)

Edited By: Tetsuji Muto and Yoshihiko Tamura

Impact Factor: 0.837

ISI Journal Citation Reports © Ranking: 2016: 159/188 (Geosciences Multidisciplinary)

Online ISSN: 1440-1738

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  1. RESEARCH ARTICLES

    1. Late Holocene slip rate and average recurrence interval of great earthquakes on the Shangzhi segment of the Yilan-Yitong Fault Zone, northeastern China: Constraints from paleo-earthquakes and historical written records

      Zhongyuan Yu, Peizhen Zhang, Wei Min, Qinghai Wei and Yugang Liu

      Version of Record online: 15 NOV 2017 | DOI: 10.1111/iar.12231

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      The minimum vertical slip rate on Shangzhi segment of the Yilan-Yitong Fault Zone has been 0.80 ±0.03 mm/year during the late Holocene, and the maximum average recurrence interval of major earthquakes is 3 800 ±200 years.

    2. Age gap between the intrusion of gneissose granitoids and regional high-temperature metamorphism in the Ryoke belt (Mikawa area), central Japan

      Kota Takatsuka, Tetsuo Kawakami, Etienne Skrzypek, Shuhei Sakata, Hideyuki Obayashi and Takafumi Hirata

      Version of Record online: 15 NOV 2017 | DOI: 10.1111/iar.12224

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      No gneissose granitoid from the Ryoke belt in central Japan (Mikawa area) shows a U–Pb zircon age which matches that of high-T metamorphism (ca. 87 Ma; Nakajima et al.). The southern gneissose granitoids (81–75 Ma), although they occur in the highest-grade metamorphic zone, do not seem to represent the heat source which produced the metamorphic field gradient with a low dP/dT slope.

    3. Compositional characteristics and geodynamic significance of late Miocene volcanic rocks associated with the Chah Zard epithermal gold–silver deposit, southwest Yazd, Iran

      Hossein Kouhestani, Majid Ghaderi, Mohammad Hashem Emami, Sebastien Meffre, Vadim Kamenetsky, Jocelyn McPhie, Khin Zaw and Rasoul Nasiri Bezenjani

      Version of Record online: 26 OCT 2017 | DOI: 10.1111/iar.12223

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      Whole-rock geochemical and S r–Nd isotopic data are presented for late Miocene volcanic rocks associated with the Chah Zard epithermal Au–Ag deposit in the Urumieh-Dokhtar Magmatic Arc (UDMA), Iran. Our geochemical data indicate an adakitic-like signature for the volcanic rocks, distinguishing them from the other volcanic rocks of the UDMA, and suggest that hornblende fractionation may have played a major role in their evolution. Our data suggest that the andesitic magmas are from a heterogeneous source and likely to result from partial melting of a metasomatized mantle wedge associated with a mixture of subducted oceanic crust and sediment. These melts subsequently underwent fractional crystallization along with minor amounts of crustal assimilation.

    4. Zircon U–Pb dating of gabbro and diorite from the Bato pluton, northeast Japan

      Terumi Ejima, Yoshiaki Kon, Shigenori Kawano and Daisuke Araoka

      Version of Record online: 26 OCT 2017 | DOI: 10.1111/iar.12222

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      Zircon U–Pb dating of gabbro and diorite.

    5. SHRIMP U–Pb zircon ages of the Hida metamorphic and plutonic rocks, Japan: Implications for late Paleozoic to Mesozoic tectonics around the Korean Peninsula

      Yutaka Takahashi, Deung-Lyong Cho, Jianren Mao, Xilin Zhao and Keewook Yi

      Version of Record online: 29 SEP 2017 | DOI: 10.1111/iar.12220

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      The U–Pb ages of metamorphic zircon grains with inherited/detrital cores in paragneisses suggest that a metamorphic event took place at approximately 235–250 Ma; the cores yielded ages around 275 Ma, 300 Ma, 330 Ma, 1 850 Ma, and 2 650 Ma. Based on new age data together with geochronological and geological context of the Hida Belt, a sedimentary protolith of the paragneisses would be younger than 275 Ma and had crystallized at around 235–250 Ma.

    6. Did boninite originate from the heterogeneous mantle with recycled ancient slab?

      Susumu Umino, Kyoko Kanayama, Keitaro Kitamura, Akihiro Tamura, Osamu Ishizuka, Ryoko Senda and Shoji Arai

      Version of Record online: 28 SEP 2017 | DOI: 10.1111/iar.12221

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      The origin and genetic conditions of coexsisting high-silica and low-silica boninites from Izu–Ogasawara–Mariana forearcs are discussed. The source mantle of high-silica boninite is a harzburgite residue after 18–30 wt% melting of primitive mantle at 1.5–1.7 Ga, whereas the source of protoarc basalt, the residue of which remelted to form low-silica boninite, is lherzolite that experienced only 3.5–4.0 wt% melt depletion at 3.6–3.1 Ga, much earlier than the average depleted MORB mantle with similar degrees of melt depletion at 2.6–2.2 Ga.

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