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| 1.
論文 |
論文
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荒井, 章司 ; 石丸, 聡子 ; Arai, Shoji ; Ishimaru, Satoko
概要:
金沢大学理工研究域自然システム学系<br />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
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, 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。<br />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.
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| 2.
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論文
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荒井, 章司 ; Arai, Shoji
概要:
金沢大学理工研究域自然システム学系<br />筆者の研究を中心として，マントル岩由来の砕屑物（特に砕屑性クロムスピネル）の解析法およびその意義を総括した．マントル岩由来の砕屑物は機械的・化学的性質が特異であり，独特の意義を有する．クロムスピ
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ネルは岩石学的に重要ないくつかの元素を主要成分として含み，かんらん岩の成因を解釈する上で重要な鉱物である．その組成は，関与したマグマの組成の違いおよびサブソリダスでの冷却・変成により変化する．侵食・運搬・堆積・続成過程では化学組成の変化はなく，後背地の解析のよいツールとなる．砕屑性クロムスピネルはオマーン・オフィオライトマントル部のようなかんらん岩体の性質を概観するのに有効である．また，蛇紋岩メランジュのマトリックスのように強く破砕されたかんらん岩体の性質を理解するのに威力を発揮する．かんらん岩体を，相伴う砕屑性粒子と合わせて解析できればさらに有効である．環伊豆地塊蛇紋岩帯はよい適用例を示す．<br />Detrital materials supplied from mantle-derived rocks have peculiar mechanical and chemical characteristics that make them excellent sedimentological and tectonic markers. Chromian spinels are well known and favored petrogenetic indicators because they contain several important cations, including Mg2+, Fe2+, Cr3+, Al3+, and Fe3+, as their main components. The Mg/(Mg + Fe2+) ratio (= Mg#), Cr/(Cr + Al) ratio (= Cr#), and Ti concentration are important parameters that are commonly analyzed to petrologically characterize chromian spinels. The main hosts in the chromian spinels of mantle peridotites (harzburgite and lherzolite) and their serpentinized equivalents are Mg# and Cr#, which are controlled by the equilibrium temperature (degree of subsolidus cooling) and degree of melt extraction, respectively. The chromian spinels in detritus materials are chemically stable during sedimentation processes, and can thus serve as powerful indicators of the tectonic and geologic history of the hinterland. The derivation of detrital chromian spinels, peridotites (serpentinites), chromitites, or volcanics can be partially identified by analyzing their Mg#, Cr#, and Ti concentrations in combination with their textures. The petrologic character of highly sheared serpentinite, such as the matrix of a serpentinite mélange complex, sometimes yields an inconclusive geodynamic history, but this can potentially be inferred from detrital chromian spinels in nearby sediments. Detrital chromian spinels from modern sediments are also useful for obtaining a general view of large peridotite bodies, such as the mantle section of the Oman ophiolite. When we compare the detrital spinels with those from in situ rocks, we should note that the host rocks containing the detritus material have already been eroded. If we analyze the serpentinite sandstones together with their closely associated peridotite bodies, we can possibly obtain information on the petrologic heterogeneity of the upper mantle. Our petrographic investigation of the Circum-Izu Massif Serpentinite Belt, central Japan, provides a good example of such a combined analysis of these peridotite-serpentinite sandstone pairs.
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金沢大学フロンティアサイエンス機構 ; 金子, 周一 ; 荒井, 章司 ; Kaneko, Shuichi ; Arai, Shoji
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Hirano, Akihiro ; Nakayama, Kenji ; Arai, Shoji
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Arai, Shoji
概要:
金沢大学理工研究域自然システム学系<br />Dunite and related rocks from the Moho transition zone of the East Pacific Rise (EPR) and the Mid
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-Cayman Trough (MCT) are examined to know the spreading-rate dependence of their compositions. The rocks from both ridges are basically a reaction product between peridotite and primitive MORB. Despite the large difference of prevalent peridotite chemistry, depleted harzburgite for EPR and lherzolite for MCT, the dunite has less different compositional ranges. The Al2O3 content of spinel differs only by 5 wt%, which may be equivalent to the difference of about 1 wt% of Al2O3 in the melt. This is almost equal to the possible spreading-rate dependent compositional difference of observed Mg-rich MORB. The relatively unfractionated MORBs erupted are in equilibrium with the oceanic dunite of which composition is independent of or only slightly dependent on spreading rate. Dunite is calculated to be about half of the total oceanic mafic crust by weight. The dunite is concentrated as the Moho transition zone, and is sparsely distributed as small lenses within the uppermost mantle peridotite.
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| 6.
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阿部, なつ江 ; 荒井, 章司 ; Abe , Natsue ; Arai, Shoji
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金沢大学大学院自然科学研究科自然計測
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Arai, Shoji ; Shimizu, Yohei ; Gervilla, Fernando
概要:
We found quartz diorite veins (up to 5 mm thick), composed mainly of plagioclase and quartz, in a plagioclase-bearing spinel lherzolite xenolith in alkali basalt from Tallante, Southern Spain. The quartz diorite veins are coarse-grained, the
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average grain size being 0.5 mm, and have thin orthopyroxenite rim along olivine wall. Thinner veins free of quartz and composed solely of plagioclase with orthopyroxene selvage are much more common in other xenoliths from Tallante. The involved melt was strongly reactive with olivine to form orthopyroxene, which can protect against further reaction. This suggests how the silica-oversaturated melts, after supplied from downgoing slabs, can move through peridotite and reach the shallow mantle with preserving the silica-oversaturated character. The armor of orthopyroxenite is of vital importance for the melt, to keep its silica-oversaturated character within peridotite. Precipitation of orthopyroxene combined with olivine consumption somewhat controls the general chemical trend of adakite. Orthopyroxenite vein network at the expense of olivine is expected to be common as fossil conduits within the mantle wedge. This kind of orthopyroxenite has contributed to Si-enrichment of the mantle wedge.
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荒井, 章司 ; 前田, 仁一郎 ; 小山内, 康人 ; 新井田, 清信 ; Arai, Shoji ; Maeda, Jin-ichiro ; Osanai, Yasuhito ; Niida, Kiyoaki
概要:
金沢大学大学院自然科学研究科自然計測
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| 9.
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石丸, 聡子 ; 荒井, 章司 ; Ishimaru, Satoko ; Arai, Shoji
概要:
金沢大学大学院自然科学研究科自然計測
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阿部, なつ江 ; 荒井, 章司 ; Abe, Natsue ; Arai, Shoji
概要:
金沢大学大学院自然科学研究科自然計測
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