Crustal Evolution of a Paleozoic Intra-oceanic Island-Arc-Back-Arc Basin System Constrained by the Geochemistry and Geochronology of the Yakuno Ophiolite, Southwest Japan | Zendy

Yoshimitsu Suda | Zendy; Yasutaka Hayasaka | Zendy; Kosuke Kimura | Zendy

Open Access

Crustal Evolution of a Paleozoic Intra-oceanic Island-Arc-Back-Arc Basin System Constrained by the Geochemistry and Geochronology of the Yakuno Ophiolite, Southwest Japan

Author(s) -

Yoshimitsu Suda,

Yasutaka Hayasaka,

Kosuke Kimura

Publication year - 2014

Publication title -

journal of geological research

Language(s) - English

Resource type - Journals

eISSN - 1687-8841

pISSN - 1687-8833

DOI - 10.1155/2014/652484

Subject(s) - geology , ophiolite , geochemistry , geochronology , island arc , paleozoic , oceanic crust , rift , crust , back arc basin , zircon , subduction , paleontology , structural basin , tectonics

The Yakuno ophiolite in southwest Japan is considered to have been obducted by the collision between an intra-oceanic island-arc-back-arc basin (intra-OIA-BAB) system and the East Asian continent during the late Paleozoic. New SIMS (SHRIMP) zircon U-Pb determinations for amphibolite and metagabbro of BAB origin within the Yakuno ophiolite yield ages of 293.4 ± 9.5 Ma and 288 ± 13 Ma, respectively. These ages are slightly older (however, overlapping within analytical errors) than the magmatic age of arc granitoids (ca. 285–282 Ma) that intruded into the mafic rocks of BAB origin. Results from geochronological and geochemical data of the Yakuno ophiolite give rise to the following tentative geotectonic model for the Paleozoic intra-OIA-BAB system: the initial stage of BAB rifting (ca. 293–288 Ma) formed the BAB crust with island-arc basalt (IAB) signatures, which was brought to the OIA setting, and generated the arc granitoids (ca. 285–282 Ma) by anatexis of the BAB crust. A later stage of BAB rifting (

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