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| 題 名 | Stable Isotope Studies on Amygdaloidal Carbonates in Penghu Basalt, Taiwan=臺灣澎湖玄武岩中杏仁狀碳酸鹽充填物之穩定同位素研究 |
|---|---|
| 作 者 | 俞震甫; | 書刊名 | 中國地質學會會刊 |
| 卷 期 | 35:4 1992.10[民81.10] |
| 頁 次 | 頁313-322 |
| 分類號 | 358.38 |
| 關鍵詞 | 充填物; 玄武岩; 同位素; 杏仁狀; 碳酸鹽; 臺灣; 澎湖; 穩定; |
| 語 文 | 英文(English) |
| 中文摘要 | 本研究分析了臺灣澎湖玄武岩中杏仁狀碳酸鹽充填物(霰石及方解石)之穩定同位素組成。結果顯示霰石之同位素組成(δ�XO = +28.5 to +29.7o/oo, δ�CC = -5.0 to +2.1o/oo)較方解石者(δ�XO = +22.2 to +27.0 o/oo, δ�CC =-43.7 to -4.8 o/oo)為高。根據碳同位素組成,這些碳酸鹽被認為是分別自海水、地下水、及二者之混合溶液中沈澱形成。由氧同位素分化之估計,這些碳酸鹽的形成溫度約為20°C。文中並討論這些杏仁狀碳酸鹽充填物之可能成因。 |
| 英文摘要 | Stable isotope analyses were carried out for the aragonite and calcite in carbonate amygdales found in Penghu basalts. The results show that the aragonite (δ�XO = +28.5 to +29.7o/oo, δ�CC = -5.0 to +2.1o/oo) is enriched in �XO and �CC with respect to the calcite (δ�XO = +22.2 to +27.0 o/oo, δ�CC = -43.7 to -4.8 o/oo). According to the C-isotope compositions, seawater, meteoric ground-water, and a mixture of seawater and meteoric ground-water are suggested to be the responsible fluids for the precipitation of these carbonates. Based on the O-isotope fractionations, a formation temperature around 20°C is estimated. The origins of aragonite vs. calcite, and carbonate vs. aeolite amygdales are discussed. |
本系統中英文摘要資訊取自各篇刊載內容。