@article{oai:kanazawa-u.repo.nii.ac.jp:00057347,
 author = {Arai, Shoji and Ishimaru, Satoko and 荒井, 章司 and 石丸, 聡子},
 issue = {8},
 journal = {地質学雑誌, The Journal of the Geological Society of Japan},
 month = {Aug},
 note = {本論文では島弧マグマ中および島弧に噴出した他のマグマ中の捕獲岩，さらに前弧域の海底に露出するかんらん岩を島弧リソスフェアマントルを代表するものとして，その岩石学的性質（モード組成, 鉱物化学組成, 平衡条件, 酸化還元状態）を総括した．特に火山前線～前弧域の枯渇したハルツバーガイトの存在は上部マントル・ウェッジを特徴づける．それらは高度部分溶融の融け残りである．また，それらの多くは交代作用（シリカの付加および加水作用）を被っている．トレモラ閃石の存在は，低温および/または枯渇した（Alに乏しい）化学組成を示唆し，特徴的である．特に太平洋西部の火山前線～前弧域のものは比較的高い酸素フガシティーを示し，島弧マントルを強く特徴づけている．ただし，いくつかの島弧かんらん岩は低い酸素フガシティーを示すことが注目される．特に，マントル・ウェッジ深部には強い還元的な流体が存在している。, The mantle wedge is an important locus for material recycling, magma generation, and fluid transportation from the slab, and should therefore be thoroughly examined to better understand these processes. Peridotite xenoliths transported to the surface by arc magmas, or by other magmas, may be representative of the upper part (lithosphere) of the mantle wedge. Fore-arc peridotites exposed on the seafloor also represent the uppermost part of the mantle wedge. We summarize their modal composition, mineral chemistry, equilibrium temperature, and redox state, and discuss the implications for mantle-wedge processes. The arc peridotites are thought to derive mainly from the spinel to plagioclase-peridotite stability fields. They are varied in character, depending on their history as well as the tectonic setting (e.g., fore-arc, volcanic front, and back-arc) of their source regions. Some arc peridotites, especially those from the fore-arc to the volcanic front, are harzburgites and contain high-Mg olivine and high-Cr spinel, with high degrees of partial melting. They also show metasomatism, silica enrichment (i.e., formation of secondary orthopyroxene at the expense of olivine), and hydration (i.e., precipitation of Ca-amphiboles and/or phlogopites). The presence of tremolite, which is indicative of low temperatures and/or depleted (Al-poor) chemistry, is characteristic of sub-arc mantle peridotites. The equilibrium temperature is relatively low (＜1100℃) with the exception of the Noyamadake peridotites, SW Japan arc, which are characterized by high temperatures (～1200℃). Some peridotites from the Western Pacific show high oxygen fugacities relative to abyssal peridotite (although a few peridotites show relatively low oxygen fugacities or contain secondary veins composed of highly reduced minerals such as metals and alloys). This indicates the importance of local reducing agents in the mantle wedge., 金沢大学理工研究域自然システム学系},
 pages = {551--573},
 title = {島弧上部マントルの岩石学的性質: 何が固有か?},
 volume = {124},
 year = {2018}
}