大屯火山群是一座位於北台灣的活火山，火山活動造就大屯火山含有豐富的溫泉資源，硫為溫泉中含量最為豐富的元素之一。在熱液上升過程中因為水岩反應產生顯著同位素分化，其同位素比值能夠作為熱液流體的來源及傳輸路徑的指標。為區分不同溫泉中熱液系統的來源，本研究分析溫泉硫酸鹽的硫同位素組成，並綜合前人研究之其他同位素資料，探討該區域熱液的來源及硫同位素的分化現象。本研究的樣本，在大屯火山溫泉地區共有八處，其中以大埔溫泉離海最近，地熱谷溫泉則距海最遠。樣品分別以感應耦合電漿光譜儀(ICP-OES)與感應耦合電漿質譜儀(ICP-MS)測定其主要元素和微量元素濃度；使用陰離子交換樹脂純化溫泉水之硫酸鹽，最後利用多接收器感應耦合電漿質譜儀(MC-ICP-MS)進行硫同位素分析。結果顯示，大屯火山群之溫泉水的δ34S落在-3.9‰至+29.1‰。大埔溫泉與地熱谷溫泉的δ34S分別為+29.1‰與+26.0‰，具有非常重的δ34S比值，而四磺坪則是-3.9‰有相對輕的硫同位素比值。其中大埔溫泉的Na離子濃度相對於地熱谷溫泉來得高且該地點接近沿海，認為有海水來源的注入。根據硫酸根離子與碳酸鈣離子濃度，將該區域的溫泉水分為酸性硫酸鹽泉與中性碳酸鹽泉並藉由piper diagram圖將溫泉性質分為第一型為鈣鎂含量較高的酸性硫酸鹽泉(七股、四磺坪、八煙)，第二型為鈣鎂含量較高的碳酸鹽硫酸鹽泉(冷水坑、湖山)，第三型為鈉含量較高的硫酸鹽氯化物泉(地熱谷、大埔)、第四型為鈣鎂含量較高的硫酸鹽氯化物泉(大油坑)。δ34S值顯示各溫泉硫酸鹽的來源，藉由δ34S與B/Cl比值的變化，探討熱液系統與岩漿揮發物來源，並依照比例分為岩漿氣體、火山風化以及雨水來源。四磺坪的δ34S為-3.9‰，且B/Cl比較低，認為大屯火山溫泉有二次酸化生成的可能性，導致四磺坪的δ34S較輕。

The Tatun Volcanic Group (TVG) in Taiwan is an active volcano, its volcanic activity has made many kind of resources in TVG including hot springs. Sulfur is one of the most abundant elements in hot springs. 34S (one of the S isotopes) will be affected by water/rock interaction in the hydrothermal system. δ34S can be used to distinguish different sources from a hydrothermal system. To understand the underground storage layer of TVG, this study aims to collected hot springs from the hydrothermal system at eight hot springs (TRK, HS, LSK, CG, DYK, SHP, BY,DP) in TVG, composed mainly andesites with minor sedimentary rock (Wuzhishan Formation) under the igneous rocks.
This study investigates chemical compositions and S isotopes in different hot springs to explore their possible sources of waters applying potential different S isotopes fractionation associated. Major and trace elements were analyzed by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) or Inductively Coupled Plasma Mass Spectrometry (ICP-MS). After pretreatment, the samples were purified in a clean room and analyzed for S isotope composition by Multi-Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS).
The preliminary results show Sulfur isotopes fall in the range of -3.9‰ to +30.1‰ in the TVG. In addition to δ34S, we further discuss the correlation between the ratio of B/Cl and δ34S, three groups of TVG hot springs were classified, including magmatic gas (DYK), and volcanic rocks weathering (TRK, HS, LSK, CG, DP), and rainwater dominated with weak weathering (BY, SHP). However, the trace elements concentration in the sedimentary rock much more than igneous rocks. The S isotope in DYK hot spring is +10.5‰ and fumarole +10.3‰, respectively, both sources show similar isotopic compositions. Most S isotopes in hot springs are much higher than seawater except that of SHP, because they are affected by vapor in Wuzhishan Formation. We suggest a scenario of double acidification reaction in SHP to create such light δ34S.

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