| Title | Full and ideal mixing behavior between Zr-Wd (K2ZrSi3O9) and Ti-Wd (K2TiSi3O9): evidences from mineral chemistry, X-ray diffraction pattern and Raman spectrum |
| Authors | Chang, Linlin Liu, Xi Wu, Chunming Liu, Xiaoyang Li, Guowu |
| Affiliation | Peking Univ, Key Lab Orogen Belts & Crustal Evolut, Minist Educ China MOE, Beijing 100871, Peoples R China. Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China. Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China. China Univ Geosci Beijing, Crystal Struct Lab, Beijing 100083, Peoples R China. China Univ Geosci Beijing, Natl Lab Mineral Mat, Beijing 100083, Peoples R China. |
| Keywords | Crystal structural relaxation High-P synthesis Ideal mixing Lamproite Wadeite solid solution WADEITE-TYPE MELTING EXPERIMENTS CRYSTAL-STRUCTURE GPA LAMPROITE MAGMAS COMPRESSIBILITY SPECTROSCOPY EXPANSIVITY SILICATES |
| Issue Date | 2015 |
| Publisher | physics and chemistry of minerals |
| Citation | PHYSICS AND CHEMISTRY OF MINERALS.2015,42,(3),223-234. |
| Abstract | A series of wadeite solid solutions (Wd(ss)) along the join K2ZrSi3O9 (Zr-wadeite, Zr-Wd)-K2TiSi3O9 (Ti-wadeite, Ti-Wd) was synthesized at 2 GPa and 1,200-1,400 A degrees C for 24 h with a piston-cylinder apparatus. The chemical composition data demonstrated that Ti and Zr readily substitute for each other, and a full series of Wd(ss) exists between the Zr-Wd and Ti-Wd end-members at the P-T conditions of our synthesizing experiments. The volume-composition relationship at ambient P-T conditions did not show any significant deviation from the Vegard's law, indicating a nearly ideal mixing between the Zr-Wd and Ti-Wd. All the Raman peaks observed at ambient P-T conditions were linearly correlated with the composition, suggesting an almost full structural relaxation for the Wd(ss). These findings suggest that the complete mixing behavior along the join K2ZrSi3O9-K2TiSi3O9, as demonstrated by our high-P experiments, may extend to a much wider range of P-T conditions. Consequently, the coexistence of the Zr-Wd and Ti-Wd in the lamproites from the Leucite Hills, Wyoming, may be due to a chemical composition change of the magma rather than a crystal structural limit. |
| URI | http://hdl.handle.net/20.500.11897/155330 |
| ISSN | 0342-1791 |
| DOI | 10.1007/s00269-014-0713-x |
| Indexed | SCI(E) EI |
| Appears in Collections: | 造山带与地壳演化教育部重点实验室 地球与空间科学学院 |
