頁籤選單縮合
題名 | Two Stages of Mineral Formation During Hydrothermal Syntheses=熱液合成實驗之兩次礦物形成期 |
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作者姓名(中文) | 羅煥記; 宋聖榮; 陳正宏; | 書刊名 | 中國地質學會會刊 |
卷期 | 37:3 1994.07[民83.07] |
頁次 | 頁343-361 |
分類號 | 357.28 |
關鍵詞 | 鋁矽酸玻璃; 礦物相的形成期; 熱液合成; Aluminosilicate glass; Stages of phase growth; Hydrothermal syntheses; |
語文 | 英文(English) |
中文摘要 | 本實驗,以鋁矽酸鹽玻璃為材料,研究熱液合成時,礦物相 的形成期。實驗在下列條件下進行:溫度--攝氏一百度至二百五 十度,壓力--飽和蒸氣壓,時間--二小時至五十天,並加入適量 的二摩爾碳酸鈉溶液。 實驗結果顯示,在玻璃完全溶解前,均形成相同的礦物相, 當玻璃完全溶解後,隨即有的礦物形成。顯然在熱液合成礦物 旳過程中,有兩次礦物形成期。第一次礦物形成期,始於玻璃開 始溶解,而終於玻璃完全溶解;第二次礦物形成期,始於玻璃完 全溶解,而終於實驗結束。 兩次礦物形成期各自合成不同的礦物相;第一次先形成不穩 定的礦物相,第二次才形成穩定的礦物相。熱液合成礦物時,從 玻璃轉變到第一次的礦物相,以及由第一次礦物相轉變到第二次 的礦物相,均經由溶解與結晶的過程而進行。 |
英文摘要 | A snythetic aluminosilicate glass was used as the solid reactant to study stages of phase growth during hydrothermal syntheses. The experiments were carried out under autogeneous pressures, temperatures from 100℃ to 250℃, and for durations of 2 hours to 50 days in the presence of a 2M Na�浚O�酒olution. The experimental results show that the synthetic phases remain unchanged prior to the complete dissolution of the glass, and that a new phase appears immediately after the dissolution is complete. Apparently, there are two stages of mineral formation during hydrothermal syntheses. The first stage of the mineral formation takes place from the beginning up to the point when the dissolution of the glass is complete. The second stage starts immediately after the completion of the dissolution of the glass and continues until the end of the experiments. synthetic mineral phases are quite different for these two stages of the mineral formation. The phases grown in the first stage are metastable, while those crystallized in the second stage are stable. The transformation of the glass to the first stage phases and from these phases to the second stage phases are solution-mediated proceses in hydrothermal syntheses. |
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