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題名 | The Effect of the Activities of K-, Na- and Ca++ on the Stability of Phillipsite and Natrolite at 1 Bar and 298°K=常溫壓下鉀、鈉及鈣的活性對十字沸石和鈉沸石安定性的影響 |
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作者姓名(中文) | 羅煥記; 宋聖榮; | 書刊名 | 中國地質學會會刊 |
卷期 | 39:4 1996.10[民85.10] |
頁次 | 頁637-652 |
分類號 | 357.28 |
關鍵詞 | 活性; 安定性; 十字沸石; 鈉沸石; Activity; Stability; Phillipsite; Natrolite; |
語文 | 英文(English) |
中文摘要 | 低矽的十字沸石和鈉沸石有相似的簡單化學式。但前者多含鉀、鈣及結晶水。兩 者是說明鉀、鈉及鈣的活性對其安定性影響的好例子。 十字沸石和鈉沸石在鉀、鈉及鈣活性中的安定性是根據熱力學數據推論而得。其結果可由下 列方程式表示: 1.8 log aNa �� - 0.8 log a K �� - 0.5 log a Ca �� =6.88. 顯然,鈉活性低,而鉀與鈣活性高的環境,有利於形成十字沸石。前述推論所得安定範圍與 十字沸石和鈉沸石的產狀很吻合。 本研究顯示,當玄武岩、安山岩、流紋岩及霞石岩漸次在海水或鹼性湖水溶解時,十字沸石 易為這些岩石的自生礦物。野外觀察顯然支持這個推論,因為上述火山岩如果受過鹽水環境 的風化作用,則十字沸石是其中最常見的自生礦物。相反的,鈉沸石只限於取代霞石或在上 述火山岩中,隨含鉀與鈣的自生礦物形成之後生成。這點正可說明鈉沸石是較少的天然沸石 。 |
英文摘要 | Silica-poor phillipsite [(K, Na, Ca��)�涉l�特i�記��.3H�烙] and natrolite (Na ��,Al �� Si �� O ��.2H �� O ) have similar simplified chemical formulas. Clearly, the former contains additional K and Ca ions as well as H �� O in comparison with the latter. Hence, they provide an excellent example to illustrate the effects of the activities of K ��, Na �� and Ca �� on their stability. The stability of phillipsite and natrolite in terms of K�� ,Na �� and Ca �� activities is delineated by theoretical considerations based on thermodynamic data. The calculated result is given by the equation, 1.8 log aNa �� - 0.8 log a K �� - 0.5 log a Ca �� =6.88. This indicates that the formation of phillipsite is favored in low a Na�� but high a k�� and a Ca�� environments as compared with natrolite. The delineated stability fields are in excellent agreement with the modes of occurrence of both phillipsite and natrolite. The present results show that phillipsite may easily form as an authigenic mineral in basalt, andesite, rhyolite and nephelinite when they progressively dissolve in either sea water or alkaline lake water. This is confirmed by field observations showing that phillipsite is a very common zeolite in the above volcanic rocks which have suffered from subaqueous alteration in saline environments. In contrast, natrolite is restricted to replacing nepheline or to forming after the formation of an authigenic K-Ca-bearing mineral in these volcanic rocks. This inference is well supported by the rarity of natural occurrences of natrolite. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。