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題名 | Garnet Zonation in Metapelites of the Blue Ridge, Southern Appalachians Around Shooting Creek Area (NC), USA=南阿帕拉契山脈藍嶺秀汀奎地區變質泥岩中石榴子石之環帶現象 |
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作者 | 陳維民; | 書刊名 | 中國地質學會會刊 |
卷期 | 37:1 1994.01[民83.01] |
頁次 | 頁19-38 |
分類號 | 358.6 |
關鍵詞 | 成長環帶; 擴散環帶; 藍嶺; 成份均勻化; 石榴子石的大小; 溫度-時間歷史; Growth zoning; Diffusional zoning; Blue Ridge; Compositional homogenization; Size of garnet; Temperature(T)-time(t) history; |
語文 | 英文(English) |
中文摘要 | 電子微探分析結果顯示,產於南阿帕拉契山脈藍嶺秀汀奎地 區之變質石榴子石多具有化學成分上的環帶現象。這些環帶現象 對闡釋變質反應時非常重要,尤其是對吉布斯方法。 在本研究中,共有兩類的石榴子石成份剖面。第一類通常顯 示平緩的成剖面而無明顯之化學環狀分佈。第二類則具有明顯 的環帶現象,可再分成兩種,他們分別是成長環帶及擴散環帶。 造成這些環帶的原因,文中有詳細的描述與討論。 本研究發現,含成長環帶石榴子石之標本與含擴散環帶石榴 子石之標本其產出位置相距不遠,且其間並無過渡性之標本發現 ,這暗示本區之變質度可能已被擾動過。 |
英文摘要 | A microprobe investigation carried out in the samples collected from the Blue Ridge, southern Appalachians around Shooting Creek area showed that the garnets in this area generally displayed some degree of compositional zoning throughout all metamorphic grades. The interpretation of garnet zonation is critical to the study of metamorphic reactions, ewpecially to the Gibbs Method. Two types of compositional profiles were observed for the garnets in the present study. The first type showed relatively flat compositional profiles without distinguished zoning distribution of elements; however the second showed distinct zoning in the compositional profiles. Within the second, two kinds of zoning are interpreted in the present study, namely growth zoning and diffusion zoning. The processes causing these compositional zonations are thoroughly described and discussed. The juxtaposition of samples with garnet growth zoning and diffusional zoning found in the present study suggested that the metamorphic isograds were probably perturbed in the study area. |
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