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題名 | Synthesis of Merlinoite from Andesitic Tuff Under Hydrothermal Conditions=安山凝灰岩合成鋇十字沸石之研究 |
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作者 | 羅煥記; 胡植慶; 宋聖榮; 李麗君; | 書刊名 | 中國地質學會會刊 |
卷期 | 42:1 1999.02[民88.02] |
頁次 | 頁125-142 |
分類號 | 358.13 |
關鍵詞 | 熱液實驗; 安山凝灰岩; 鉀離子; 鋇十字沸石; 天然水; 母岩; Hydrothermal experiments; Andesitic tuff; Potassium ions; Merlinoite; Natural waters; Host rocks; |
語文 | 英文(English) |
中文摘要 | 本實驗以安山凝灰岩、安山凝灰岩混以矽酸為材料,在飽和蒸氣壓, 溫度攝氏 100 度、130 度及 150 度, 氫氧化鉀、氫氧化鉀和氮氣化鈉混合液,碳酸鉀、碳酸鉀和碳 酸鈉混合液中,進行了 3 小時至 30 天的鋇十字沸石合成研究。 實驗結果顯示,鋇十字沸 石只能在含鉀離子溶液中合成,且在鉀與鈉混合液中的合成量高於在純鉀液者。以安山凝灰 岩為材料時,鋇十字沸石在氫氧化鉀與氫氧化鈉混合液中的合成量高於在碳酸鉀與碳酸鈉混 合液者,但以安山凝灰岩與矽酸混合者冉材料時,其結果剛好相反。在三種不同溫度的實驗 中,鋇十字沸石的合成量,以攝氏 130 度時最多,150 度時次之,100 度時最少。 前述溫 度所合成的頭十字沸石,均屬準穩相,因在較長時間的實驗時,即轉變為鹼性長石。天然鋇 十字沸石,主要在攝氏 20 度至 50 度,低壓至常壓時,高鉀或高檢性岩類與天然水(海水 或鹽湖水)作用所形成。因此,該沸石稀少的原因主要受其母岩(高鉀或高鹼性岩)分佈有 限的影響。 |
英文摘要 | Hydrothermal experiments on an andesitic tuff and the andesitic tuff mixed with silicic acid have been carried out under varying conditions: autogeneous pressures, durations of 3 hours to 30 days in the presence of KOH, KOH and NaOH mixed, K �� CO �� and K �� CO �� and Na �� CO �� mixed liquids and temperatures oflOO ℃,130 ℃ andl50 ℃. The experimental results indicate that merifrioite can only be synthesized in liquids containing potassuiin ions. ltis;:also noted that a better yield of merlinoite is obtained in K and Na mixed liquids than in K liquids. More yield of merlinoite is generally got from KOH or KOH and NaOH mixed liquid than from the K �� CO �� and Na �� CO �� mixed one in the andesitic tuff. But it is vice versa in the andesitic tuff mixed with silicic acid. in the three different temperatures, the best yield of merlinoite is obtained at 130 ℃, the intermediate one at 150 ℃, and the least one atlOO ℃. At these temperatures, merlinoite is metastably produced and eventually transformed into alkali feldspar in longer runs. It is believed that natural merlinoite may essentially form through interaction of high potassic or high alkalic rocks and natural waters at about 20 ℃ to 50 ℃ and at very low to ambient pressures. So the rarity of this mineral in natural occurrence may be accounted for by a limited geographical distribution of its host rocks, i.e., high potassic or high alkalic rocks. |
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