臺灣博碩士論文加值系統

玉里帶可概分構造地塊與原地片岩兩類地質單位，原地型變質泥質岩內有透鏡狀變質鐵鎂質岩、蛇紋岩塊體分佈，不同岩性之接觸面上均有新變質礦物生成，保存下經過深埋而變質的特徵。本研究新發現變質泥質岩中石榴子石具兩階段的生長環帶，ZoneII石榴子石覆生於ZoneI石榴子石上，可對比為M1及M2兩個前進變質階段，以及石榴子石邊緣融蝕生成綠泥石之M3退變質的歷程，多矽白雲母的Si含量於泥質系統中偏高，隱示可能經歷有較高壓的早期變質階段；變質鐵鎂質岩中角閃石具有成份環帶，核部為鎂角閃石，邊部為陽起石，IVAl與Na[M4]由核部逐漸朝邊部降低，少量鈉-鈣群角閃石凍藍閃石(barroisite)分佈在鈉長石變斑晶內和鎂角閃石核部，隱示角閃石形成於退變質時期，可對比變質鐵鎂質岩中鈉-鈣群角閃石的發現為M2變質階段的殘餘，具環帶之角閃石為M3退變質時期的產物。
變質泥質岩及變質鐵鎂質岩內碎屑性殘餘電氣石投影於Al-Fe(tot)-Mg與Ca-Fe(tot)-Mg三角圖顯示核部可能來自不相同的原岩系統(cf. Henry, 1992)，邊部則可能為變質生長；本研究之變質鐵鎂質岩成分與構造地塊內綠色片岩基本上相同(cf. Tsai et al., 2013)，故構造地塊可能為一集合超鐵鎂及變質鐵鎂質岩之混合塊體，應類似於主體片岩內包夾之變質鐵鎂質岩凸鏡體，玉里帶整體在變質前很可能與構造地塊為板塊隱沒帶附近的同源環境(cf. Lin et al., 1984)。
經由石榴石-鈦鐵礦地質溫度計及角閃石地質溫度計推估M1進變質階段溫度約可達560±30˚C，生成ZoneI石榴子石、鈉雲母、鈉-鈣群角閃石；多矽白雲母於M2時期大量生成，其Si的等值線表示M2時期壓力約10-12kbar，變質鐵鎂質岩內鈉長石包裹的M2殘餘角閃石溫度560±50˚C；M3退變質階段生成鈣群角閃石，核部變質溫度約515±50˚C，邊部變質溫度約370±50˚C。

The Yuli belt of the eastern Taiwan is generally divided into two parts: tectonic (or exotic) blocks and in-situ schists. The former consists mainly of serpentinite and metabasite, whereas the latter is represented by metapelite and metapsammite with subordinate greenschist. The contacts between these two different litho-units tend to contain newly-recrystallized minerals that indicate a possible origin of metasomatism. In the in-situ metapelites, this study found a new type of two-stage garnet zoning with a sharp break in between. Zone I garnet (core) is overgrown by Zone II garnet (mantle). Compositional patterns of Zone I and II imply two stages of garnet prograde growth (M1 and M2). Chlorite commonly replaces Zone II garnet in the outer-most rim, indicating a late-stage retrograde metamorphism (M3). Some amphiboles in the metabasite show compositional zoning with a magnesiohornblende core and an actinolite rim; rare barroisitic compositions are also detected in the core of some samples.
The in-situ schist also contains tourmaline, which commonly shows zoning. Plots of tourmaline core compositions on Al-Fe(tot)-Mg and Ca-Fe(tot)-Mg diagrams show great variation and suggest that the tourmaline grains were originated from different protolith sources or geologic environments (cf. Henry et al., 1992), whereas the rim compositions are consistent indicating a metamorphic growth. The metamorphic temperature of M1 was estimated at 560 ± 30˚C with the garnet-ilmenite thermometer (Pownceby et al., 1987) assuming equilibrium. The M2 pressure was estimated at 10-12 kbar on the basis of phengite Si content isopleths with temperature constraint at 560 ± 50˚C. A schematic clockwise P-T path is proposed for the in-situ schist, implying an evolution from subduction to collision for the Yuli belt metamorphic rocks (cf. Beyssac et al., 2008).

表目錄﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒II
圖目錄﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒III
礦物名稱縮寫﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ VII
第一章 緒論﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒1
1-1 前言﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 1
1-2 區域地質背景﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 4
1-3 採樣地點與野外產狀﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 6
第二章 岩象觀察﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 17
2-1 變質泥質岩﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 19
2-2 變質鐵鎂質岩﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 35
2-3 蛇紋岩﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 60
第三章 礦物化學分析﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 65
3-1 石榴子石﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 66
3-2 斜長石﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 76
3-3 角閃石﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 81
3-4 綠簾石﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 101
3-5 雲母類﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 109
3-6 綠泥石﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 115
3-7 電氣石﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒ 121
第四章 討論﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒135
第五章 結論﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒145
引用文獻﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒147
附錄A 研究流程﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒153
附錄B 採樣編號與位置圖﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒155
附錄C 能量散射光譜儀表示之少見金屬礦物光譜﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒﹒156

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