有機碳與黃鐵礦之關係

(Raiswell and Berner, 1983)。Lin and Morse (1991) 也指出近岸、陸棚及陸坡上的 沈積物中也存在這種關係，而在無氧環境 (anoxic) 下其比值會偏低，但在缺鐵 能是因為各樣本的原始沈積環境不同，且根據Raiswell and Berner (1986) 指出變 質過程會造成 C/S ratio 減小，因此變質度的變化也可能是資料變動劇烈的原 因。

Corg (%)

0.0 0.2 0.4 0.6 0.8 1.0

S p (% ) y

0.0 0.5 1.0 1.5 2.0

中橫

紅柴林結元井 清水IC-21井 清水一號井 一般海洋環境

圖 4-5 所有樣本之有機碳與黃鐵礦硫關係圖。實心圓點為中橫變質帶之樣本，

空心圖型為宜蘭地區之樣本，三角形：清水 IC-21 號井、圓形：紅柴林結元井、

正方形：清水一號井，黑色直線為一般海洋環境之變化相關趨勢。

4.3 硫同位素特徵與變化

δ³⁴S 值變化很大。本研究在宜蘭地區的黃鐵礦樣品可區分為兩類，一類為板岩

應該還保留沉積型黃鐵礦之硫同位素特徵，而多次變質之綠色片岩相 (GG) 的樣 品，其黃鐵礦 δ³⁴S 值趨於集中，但前人研究 Alirezaei and Cameron (2001) 認為 即使到了角閃岩到粒變岩變質相，對含硫礦物仍沒有造成同位素均質化的現象，

因此本研究有此現象可能只是因樣品數量和種類的涵蓋性不足所導致。

圖 4-6、地球上各種物質中 δ³⁴S 值的變化情形。摘自 Liu et al. (2016)。

-40 -30 -20 -10 0 10 20

樣品數

0 2 4 6 8 10 12 14

圖 4-7 宜蘭地區之黃鐵礦穩定硫同位素值。黑色是小顆粒萃取之黃鐵礦，灰色

δ

S

(‰)

第五章 結論

本研究分析台灣宜蘭地區三口地熱井，清水 IC-21 號井、清水一號井、紅 柴林結元井以及台灣中部橫貫公路變質帶之有機碳、無機碳、總氮、黃鐵礦硫含 量以及穩定硫同位素組成，結合前人研究希望進一步了解宜蘭地區板岩帶的基本 特性，以及變質作用對沉積岩之地球化學的影響，得到以下結果：

一、 宜蘭地區的三口地熱井，其碳、氮、硫等含量並未受到變質作用大幅影

響，應與原始沉積含量相近，並依照其有機碳與總氮之比值約為 5 附近，

認為有機物質大致來源相同，應為海源沉積物。透過有機碳與黃鐵礦含量之 關係，認為其原始沉積環境應該是屬於有機物質、硫酸鹽含量與可反應含鐵 物質皆充足、硫酸還原反應快速的缺氧海洋環境。

二、 藉由黃鐵礦的產狀以及穩定硫同位素特徵，可以大致將宜蘭地區板岩帶

的黃鐵礦分為兩類，一類為典型沉積型黃鐵礦，其顆粒較小須透過萃取方式 取得，同位素值保留典型沉積型黃鐵礦之穩定硫同位素特徵，δ³⁴S 值變化 很大，範圍約在 -40 ‰ 到 20 ‰ 之間；另一類為變質或後期流體作用所形 成的結核狀或自形狀的大顆粒黃鐵礦，δ³⁴S 值的變化較小，範圍約在 - 10 ‰ 到 5 ‰ 之間。黃鐵礦之產狀和穩定硫同位素特徵顯示熱液活動的徵兆，而 熱液活動的發生可能與前人研究所指出宜蘭地區較高地溫梯度的原因為其 底下之岩漿庫所造成有關。

三、 中部橫貫公路變質帶樣品，其碳、氮、硫等元素的變化隨變質度增加到

多次變質綠色片岩相而稍有碳、氮流失和硫同位素值一致化的現象，但因樣 品數量和種類的涵蓋性不足，尚須進一步的研究。

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