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題 名 | High-Temperature Oxidation of Titanomagnetite in Andesitic Rocks of the Coastal Range, Eastern Taiwan=臺灣東部海岸山脈安山岩中鈦磁鐵礦之高溫氧化作用 |
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作 者 | 楊宏儀; 陳俊杰; | 書刊名 | 中國地質學會會刊 |
卷 期 | 37:3 1994.07[民83.07] |
頁 次 | 頁291-307 |
分類號 | 358.36 |
關鍵詞 | 鈦磁鐵礦; 氧化作用; 礦物相變; 偏析作用; Titanomagnetite; Oxidation; Texture; Mineral transformation; Exsolution; |
語 文 | 英文(English) |
中文摘要 | 臺灣東部海岸山脈安山岩中鈦磁鐵礦遭受了各種程度不同的 氧化作用。在高溫氧化的過程中鈦磁鐵礦的行為受控於鈦含量, 冷卻速率,氧化速率,以及氧分壓。 在輕微氧化期中,鈦磁鐵礦偏析出第一代排列整齊之三組鈦 鐵礦條紋。在中度氧化期中,鈦磁鐵礦再析出第二代三組鈦鐵礦 條紋,三組赤鐵礦條紋,以及針狀之鎂鋁尖晶石。各析出物相互 間以及與鈦磁鐵礦間都有一定的結晶方位。鈦鐵礦條紋也會更進 一步氧化成金紅石和赤鐵礦。在強烈氧化期中,條紋中之金紅石 和赤鐵礦反應形成鐵板鈦礦,基質的鈦磁鐵礦也會氧化成赤鐵礦 和補綴狀的鐵板鈦礦。在輕微氧化期中鈦磁鐵礦所析出的三組平 直之鈦鐵礦條紋有時會在強烈氧化期中直接氧化成赤鐵礦和鐵板 鈦礦形成扭曲之條紋。低鈦之鈦磁鐵礦經由急速氧化會偏析出三 組赤鐵礦條紋由顆粒外緣向內成長,並不析出鈦鐵礦條紋。 |
英文摘要 | The titanomagnetites in the andesitic rocks of the Coastal Range of eastern Taiwan have been oxidized at high-temperatures to various extents. In the stage of weak oxidation, titanomagnetites exsolve three sets of well-oriented ilmenite lamellae of the first generation. In the stage of moderate oxidation, titanomagnetites exsolve another three sets of ilmenite lamellae of the second generation, three sets of hematite lamellae, and the Mg-Al spinel blebs. The lamellar ilmenites of both generations are further oxidized to rutile and hematite. In the stage of strong oxidation, rutile and hematite in the altered ilmenite lamellae react to form pseudobrookites, while patchy pseudobrookites might also be formed form the matrix which consists of titanomagnetite and hematite in this stage of oxidation. The three sets of ilmenite lamellae exsolved form titanomagnetites in the stage of weak oxidation might also be oxidized directly to pseudobrookites and hematite to form contorted discontinuous lamellae in the stage of strong oxidation. The rapid oxidation of titanomagnetites containing low TiO�疾xsolves hematite lamellae from the grain margin toward the core without the precedent exsolution of ilmenite lamellae. Overall, the present study has found that the behavior of titanomagnetites in response to oxidation at high temperatures is controlled by their TiO�畚ontents, the rate of cooling of the magmas and rocks, the rate of oxidation, and oxygen fugacity. |
本系統中英文摘要資訊取自各篇刊載內容。