花蓮瑞穗地區位於台灣東部的玉里變質帶，主要藉由造山運動期間深部高溫變質岩體沿隱沒通道之快速抬升，將深層熱能帶往靠近地表，形成地溫梯度異常區，其區域內地熱流體之鈉、氯、鐵、碳酸氫根及硫酸根離子濃度差異極大，暗示地下儲集層內部具有複雜的構造裂隙與多樣的熱液循環路徑。本研究透過195°C高壓熱液反應釜進行為期七天與三十天之水岩反應實驗，釐清黑色片岩、斑點片岩、蛇紋岩、藍閃石片岩、變質輝長岩、陽起石片岩、退變質角閃岩與大理岩對熱液特徵之控制機制，由此探討瑞穗溫泉可能之離子來源，並評估地質溫度計之適用性。實驗結果顯示：(1)斑點片岩在氧化環境下會釋放顯著的硫酸根離子，導致流體酸化；(2)藍閃石片岩和斑點片岩是釋放氯離子和鈉離子的主要來源，推測是藍閃石、綠泥石中OH基團被氯離子取代並在水岩反應中釋出，但實驗尺度仍與實際溫泉水離子濃度差異極大；(3)蛇紋岩和退變質角閃岩中的磁鐵礦與變質輝長岩以及藍閃石片岩中的鮞綠泥石，極可能是外溫泉流體中高濃度鐵離子的主要來源。將實驗結果與現地溫泉特徵結合，內溫泉因地理位置坐落於瑞穗片岩之上，其岩性富含斑點片岩，氫氧同位素顯示其循環較淺，受氧化態天水補給影響，因此有較高的硫酸根濃度；外溫泉呈現不等的高鹽度、高氯離子和富鐵的特徵，反映出流體經歷深部長期或更高溫的水岩交互作用。無蒸氣散失石英地質溫度計在瑞穗地區具有高度可靠性，但在需注意流體酸化和二氧化矽過飽和導致溫度推估偏差。;The Ruisui geothermal area in Hualien is located within the Yuli belt of eastern Taiwan， where deep-seated， high-temperature metamorphic rock bodies underwent rapid exhumation along a subduction channel during orogeny， bringing deep thermal energy to the shallow crust and forming a geothermal gradient anomaly. Hydrothermal fluids in this region exhibit extreme contrasts in concentrations of Na+， Cl-， Fe3+， HCO3-， and SO42- ions， implying complex structural fractures and diverse fluid circulation pathways. This study uses hydrothermal reactors experiments at 195°C for durations of 7 and 30 days to clarify the lithological controls of eight metamorphic rocks: Black Schist， Spotted Schist， Serpentinite， Glaucophane Schist， Meta Gabbro， Actinolite Schist， Retrograded Amphibolite， and Marble on hydrothermal characteristics， thereby investigating potential ion sources and evaluating chemical geothermometers. Experimental results indicate that: (1) Spotted schist releases significant SO42- under oxidizing conditions， inducing fluid acidification. (2)Glaucophane Schist and spotted schist serve as the primary sources for Cl- and Na+ ions， which is inferred to result from a dehydration evolution process where Cl- isomorphous substitutes for OH- groups in glaucophane and chlorite; however， a significant concentration gap remains between the experimental scale and actual hot spring waters. (3)Magnetite in Serpentinite and Retrograded Amphibolite， alongside Chamosite in Meta Gabbro and glaucophane schist， are the likely sources of high Fe in the outer hot spring fluids. Integrating experimental findings with field data reveals that the Inner Hot Springs are situated in Spotted Schist areas， featuring shallow meteoric circulation influenced by oxidizing recharge that yields higher sulfate concentrations. Conversely， the Outer Hot Springs display varying degrees of high salinity， high Cl-， and rich Fe2+， reflecting deep， long-duration， or higher-temperature water-rock interactions. Regarding geothermometer applicability， the no steam loss quartz geothermometer demonstrates high reliability in the Ruisui area， though caution must be exercised regarding temperature estimation biases caused by fluid acidification and silica oversaturation.
