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題 名 | Chemical Characteristics of Amphiboles in the Mafic Schists of the Juisui Area=花蓮瑞穗地區鐵鎂質片岩中角久石之化學特性 |
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作 者 | 陳維民; 楊昭男; | 書刊名 | 中國地質學會會刊 |
卷 期 | 40:3 1997.07[民86.07] |
頁 次 | 頁625-638 |
分類號 | 358.13 |
關鍵詞 | 角閃石化學; 藍閃石片岩; 環帶角閃石; Na(M4)及Al(VI)含量; 成分的不連續; Chemistry of amphiboles; Glaucophane schists; Zoned amphiboles; Na(M4) & Al(VI); Compositional discontinuity; |
語 文 | 英文(English) |
中文摘要 | 本研究主要為了了解花蓮瑞穗地區鐵鎂質片岩中角閃石之化學特性。本研究選了 來自不同構造位置的三個標本以為電子探針分析之用。分析結果顯示藍閃石片岩中環帶角閃 石由核心至邊緣其成份由鈉-鈣角閃石變為鹼性角閃石,至於最外圍則轉變為鈣角閃石。佔位 分析發現藍閃石片岩中環帶角閃石由核心至邊緣其成份變化以GL替換佔優勢。而GL替換中, 又以PL替換較TS替換為多。成份剖面顯示藍閃石片岩中環帶角閃石在鈉-鈣角閃石與鹼性角 閃石之間有一成份上的不連續存在,這個不連續可能代表鈉-鈣角閃石與鹼性角閃石之間有一 個不溶合的區域存在,或者是反應了這些環帶角閃石受過多期的變質作用。基於組織上的證 據,以受過多期變質作用的可能性較高。 |
英文摘要 | A study of the chemical mineralogy of amphiboles from the mafic schists in the Juisui area is reported here. Three representative samples from different tectonic positions were used for microprobe analyses in the study. These analyses show that the compositions of zoned amphiboles from core to rim in the glaucophane schist shifted from sodic-calcic amphibole through alkali amphibole and finally to calcic amphibole. The analyses from site occupancies indicate that GL substitution dominates this composition change from core to rim for zoned amphiboles in the glaucophane schist. Moreover, PL substitution dominates over TS substitution within this particular GL substitution. A compositional profile of a zoned amphibole from the glaucophane schist reveals a compositional discontinuity between alkali and sodic-calcic amphiboles. This discontinuity may reflect either multiple stages of mineral growth under distinct metamorphic conditions or a possible miscibility gap that exists between alkali and sodic-calcic amphiboles. Based on texture evidences, however, the multiple-staged metamorphism interpretation is preferred. |
本系統中英文摘要資訊取自各篇刊載內容。