| 摘要: | 本論文系統性地探討三氧同位素系統在實驗、地質與環境脈絡中的行為機制，並以三氧同位素作為整合性的地球化學示蹤工具，用以解析連結岩石圈、水圈與大氣圈之間的物質與能量交換過程。研究首先從受控實驗室系統 CO₂–CaCO₃–H₂O 展開，透過探討 CO₂–H₂O 交換、碳酸鹽沉澱與酸溶反應過程中的同位素分餾行為，建立並量化相關的三氧同位素分餾關係，以改進對碳酸鹽三氧同位素訊號的詮釋（第三章）。
在此實驗基礎上，研究進一步應用於地質記錄，聚焦於瑪利諾期（Marinoan）帽碳酸鹽，該地層保存了「雪球地球」事件後熱液改變的同位素與礦物學證據。綜合的礦物學與同位素資料顯示，這些碳酸鹽曾經歷高溫流體–岩石作用，反映出一場全球同步的熱液事件（第四章）。
此外，本研究建立了矽酸鹽三氧同位素的高精度量測流程（第五章），並進行快速脫水實驗以檢驗含水矽酸鹽礦物在加熱脫水過程中的三氧同位素效應，進而提供新的分餾機制約束與動力學見解（第六章）。該技術亦應用於臺灣北部的大屯火山群，透過整合安山岩岩心的三氧同位素、主要與微量元素以及 Sr–Nd 同位素資料，解析其次火山岩漿的演化歷程（第七章）。
鑒於近期研究指出大屯地區可能存在岩漿庫，本論文進一步拓展至噴氣孔 CO₂ 的時間序列監測。結果顯示，碳、氧同位素與伽瑪射線放射資料可在近乎即時的時間尺度上捕捉微震動、熱液循環與岩漿逸氣之間的動態耦合關係，揭示火山系統於近地表環境中的複雜互動機制（第八章）。
;This thesis investigates the behavior of triple oxygen isotope systems across experimental, geological, and environmental contexts, with triple oxygen isotopes serving as a unifying tracer of processes that link the lithosphere, hydrosphere, and atmosphere. It begins with controlled laboratory experiments on the CO2–CaCO3–H2O system, where fractionation during CO2–H2O exchange, carbonate precipitation, and acid digestion is explored and quantified to refine the interpretation of carbonate triple oxygen isotope signatures (Chapter 3). These experimental foundations are then applied to geological archives, focusing on Marinoan cap carbonates that preserve the imprint of post–Snowball Earth hydrother- mal alteration, where isotopic and mineralogical data together reveal high-temperature fluid–rock interaction during a globally synchronous event (Chapter 4). In parallel, a measurement protocol for silicate triple oxygen isotopes was established (Chapter 5), enabling further laboratory experiments that examine the triple oxygen isotope effects of rapid hydrous silicate mineral dehydration and provide new constraints on the na- ture of triple oxygen isotope fractionation (Chapter 6). In addition, the protocol was
applied to the Tatun Volcano Group in northern Taiwan, where integrated triple oxygen
isotope, major and trace element, and Sr-Nd isotope data from andesite cores illuminate
the evolution of subvolcanic magmas (Chapter 7). Given reports of a present magma body, this motivated extending the study to time-series monitoring of fumarolic CO2 at
Tatun, which demonstrates how coupled carbon, oxygen isotopes and gamma-ray radiation capture the dynamic interplay of micro-earthquakes, hydrothermal circulation, and magmatic degassing in near-real time (Chapter 8). |
