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題名 | Effects of Pressure on the Crystal Structure of Olivine in Harzburgite Xenolith of Basalt=高壓下橄欖石之晶體結構分析 |
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作者 | 余樹楨; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
卷期 | 21:3 1997.05[民86.05] |
頁次 | 頁173-179 |
分類號 | 358.48 |
關鍵詞 | 高壓; 橄欖石; 晶體結構分析; Olivine; Crystal structure; High pressure; X-ray diffraction; |
語文 | 英文(English) |
中文摘要 | 本文以鑽石高壓砧將超基性擄獲岩中橄欖石晶體加壓並分別在一大氣壓、4.3、 12.5 及 26 千下,收集 X 光繞射資料及分析其高壓下之晶體結構。 受壓時, 本橄欖石之晶室參數及鎂鐵配位八面體皆出現差異收縮的現象。 在 4.3 ∼ 12.5 千時,b 軸壓縮遠大於及 a 及 c 軸;而 M1 配位八面體收縮又明顯大於 M2 八面體。當壓 力從 12.5 到 26 千時, 差異收縮的趨勢反轉過來,即 a 及 c 軸壓縮大於 b 軸,M 2 八 面體壓縮大於 M1 八面體。 晶室參數及 M1、M2 多面體之壓縮,主要導源於 M1-0 與 M2-0 鍵距因受壓而收縮的結果。 在 26 千下,四面體配位的 Si-O 鍵長幾乎不變。同時由鍵結角的少有變異可以看出矽氧四 面體及 M1-0、M2-0 八面體在高壓下其多面體幾何形狀幾乎未受影響。本分析顯示受壓時欖 石的結構會由扭曲的、較疏鬆結構轉化為理想化的六方緊密排列 |
英文摘要 | An ollivine crystal from the harzburgite xenolith in Penghu basalt has been studied as a function of pressure using a diamond anvil cell. Crystal structures were refined from the X-ray intensity data collected at pressures up to 26 Kbar and under ambient temperature conditions. Differential contractions in the unit cell parameters and cation octahedra were observed under thestudied pressure range. Between 4.3 and 12.5 Kbar, the b axis compressed more profoundly than did the a and c axes and the M1-octahedra contracted more significantly than did the M2-polyhedra. From 12.5 to 26 Kbar, the variation trends in the cell dimensions and cation octahedra with pressure were erversed. Meanwhile, the silicon tetrahedra contranted insignificantly to 26 Kbar pressure. The decreases in the M1-0 and M2-0 bomd distances with increasing pressure were responsiblr for reduction in the cell constants and contraction in the M1 and M2 polyhedra. However, the silicon tetrahedra, M1 and M2 octahedra remained alnost unaltered in the polyhedral geometry at pressures uup to 26 Kbar as indicated by the limited bond angle variations. Transformation from a less compact and distorted HCP structure to a more compact ideal HCP array for olivine crystal under pressure is suggested by the results of the present investigation. |
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