本文選題：Compressibility + Bulk�。� 參考：《光譜學(xué)與光譜分析》2017年04期

【摘要】：在室溫高達(dá)27GPa壓力下對天然奧長石(Na_(0.86)K_(0.02)Ca_(0.12)Mg_(0.01)(Fe_(0.01)Al_(1.12)Si_(2.87)O_8))粉晶進行了原位同步輻射X光衍射(XRD)測量,獲得了樣品的狀態(tài)方程。實驗數(shù)據(jù)表明隨著壓力增大奧長石樣品在大約3.5GPa發(fā)生了三斜向單斜的相變(P1→C2)和在大約10.0GPa發(fā)生了單斜對稱相變(C2→C2/m)。樣品三個相的體模量計算值分別為K_0=73.8GPa(K′=10.98),K_((C2))=124GPa(K′=1.05)和K_((C2/m))=272GPa(K′=0.625)。樣品的元素組成影響其T—O—T鍵角的剛度、M—O鍵的強度和Si—O—Al鍵角的彎曲,從而導(dǎo)致奧長石樣品在高壓行為的特殊變化。三斜相的奧長石晶胞壓縮性具明顯的各向異性。實驗結(jié)果表明在冷俯沖帶奧長石可能是堿金屬和堿土金屬深循環(huán)的載體。
[Abstract]:The in-situ synchrotron radiation X-ray diffraction (XRDV) measurements of the natural tartan Nax 0.86K _ (+ 0. 02) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) C _ (2) O _ (8) were carried out at room temperature up to the 27GPa pressure. The in-situ synchrotron radiation X-ray diffraction (XRD) measurements were carried out for the samples, and the equation of state of the samples was obtained by means of in-situ synchrotron radiation X-ray diffraction. The experimental data show that there is a tridiagonal monoclinal phase transition in 3.5GPa and a monoclinic phase transition of C _ 2 / M _ 2 in about 10.0GPa with the increase of pressure. The calculated values of bulk modulus of the three phases are K _ 0 / 73.8GPA / K _ (10. 98) / K _ (1 / 5) and K _ (2 / 2 / m ~ (1) respectively. The element composition of the sample affects the stiffness of the T-O-T bond angle and the bending of the Si-O-Al bond angle and the strength of the M-O bond, which leads to the special change of the high-pressure behavior of the samples. The compressibility of the orschite cell of the triclinic phase has obvious anisotropy. The results show that in the cold subduction zone, the feldspar may be the carrier of alkali metal and alkaline earth metal deep circulation.
【作者單位】： 防災(zāi)科技學(xué)院;中國地震局地震預(yù)測重點實驗室(中國地震局地震預(yù)測研究所);Department
【基金】：the Natural Science Foundation of China(41373059)
【分類號】：P575

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