Rietveld refinement of clinopyroxenes with intermediate Ca-content along the join diopside-enstatite

Canadian Mineralogist

Volumn 43, Issue 4, 2005, Pages 1411-1421

  Tribaudino, Mario ^a   Nestola, Fabrizio ^b   Meneghini, Carlo ^c  

^a UNIVERSITY OF PARMA   (Italy)

^b UNIVERSITÄT BAYREUTH   (Germany)

^c ROMA TRE UNIVERSITY   (Italy)

Author keywords

Average structure; Clinopyroxene; Crystal structure; Diopside enstatite join; Phase transition; Rietveld refinement

Indexed keywords

CRYSTAL STRUCTURE; PHASE TRANSITIONS; SINGLE CRYSTALS; SYNCHROTRON RADIATION; X RAY POWDER DIFFRACTION;

CLINOPYROXENES; DIOPSIDE-ENSTATITE JOIN; RIETVELD REFINEMENT;

SILICATE MINERALS;

CLINOPYROXENE; CRYSTAL STRUCTURE; RIETVELD ANALYSIS; SOLID SOLUTION;

EID: 29244434558     PISSN: 00084476     EISSN: None     Source Type: Journal    
DOI: 10.2113/gscanmin.43.4.1411     Document Type: Article

References (40)

1. Angel, R.J., Chopelas, A. & Ross, N.L. (1992): Stability of high-density clinoenstatite at upper mantle pressures. Nature 358, 322-324.
2. 6]: a single crystal X-ray and optical study. Eur. J. Mineral. 9, 953-964.
3. 1/c clinopyroxenes and their displacive phase transitions. Contrib. Mineral. Petrol. 138 35-45.
4. 20) at T =- 130°, 25°, 400° and 700° C. Z. Kristallogr. 192, 183-199.
5. Bozhilov, K.N., Green, H.W., II & Dobrzhinetskaya, L. (1999): Clinoenstatite in Alpe Arami peridotite: additional evidence of very high pressure. Science 284, 128-132.
6. 6 join. Tschermaks Mineral. Petrogr. Mitt. 29, 223-240.
7. Brunham,, C.W., Clark, J.R., Papike, J.J. & Prewitt, C.T. (1967): A proposed crystallographic nomenclature for clinopyroxene structure. Z. Kristallogr. 125, 109-119.
8. Cámara, F., Carpenter, M.A., Domeneghetti, M.C. & Tazoli, V. (2002): Non-convergent ordering and displacive phase transition in pigeonite: in-situ HT XRD study. Phys. Chem. Minerals 29, 331-340.
9. Downs, R.T. (2003): Topology of the pyroxenes as a function of temperature, pressure and composition as determined from the procrystal electron density. Am. Mineral. 88, 556-566.
10. Gasparik, T. (1990): A thermodynamic model for the enstatite-diopside join. Am. Mineral. 75, 1080-1091.
11. 4. J. Appl. Crystallogr. 25, 589-610.
12. Howard, C.J. (1982): The approximation of asymmetric neutron powder diffraction peaks by sums of gaussians. J. Appl. Crystallogr. 15, 615-620.
13. Larson, A.C. & Von Dreele, R.B. (1985): GSAS - General Structure Analysis System. Los Alamos National Laboratory, Los Alamos, New Mexico.
14. Lindsley D.H. & Dixon, S.A. (1976): Diopside-enstatite equilibria at 850 to 1400°C, 5 to 35 kb. Am. J. Science 276, 1285-1301.
15. Meneghini, C., Artioli, G., Balerna, A., Gualtieri, A.F., Norby, P. & Mobilio, S. (2001): A translating imaging plate system for in-situ experiments at the GILDA beamline. J. Synchr. Rad. 8, 1162-1166.
16. Nestola, F., Tribaudino, M. & Boffa Ballaran, T. (2004): High pressure behavior, transformation and crystal structure of synthetic iron-free pigeonite. Am. Mineral. 89, 189-196.
17. Nowell, H., Attfield, J.P. & Cole, J.C. (2002): The use of restraints in Rietveld refinement of molecular compounds; a case study using the crystal structure determination of the tryptamine free base. Acta Crystallogr. B58, 835-840.
18. Ohashi, Y. (1984): Polysynthetically-twinned structures of enstatite and wollastonite. Phys. Chem. Minerals 10, 217-229.
19. Ohashi, Y. Burnham, C.W. & Finger, L.W. (1975): The effect of Ca-Fe substitution on the clinopyroxene crystal structure. Am. Mineral. 60, 423-434.
20. Ohashi, Y. & Finger, L.W. (1976): The effect of Ca substitution on the structure of clinoenstatite. Carnegie Inst. Wash., Year Book 75, 743-746.
21. Prewitt, C.T., Brown, G.E. & Papike, J.J. (1971): Apollo 12 clinopyroxenes: high temperature X-ray difraction studies. Geochim. Cosmochim. Acta, Suppl. 2, 1, 59-68.
22. Raudsepp, M., Hawthorne, F.C. & Turnock, A.C. (1990): Evaluation of the Rietveld method for the characterisation of fine-grained products of mineral synthesis: the diopside-hedenbergite join. Can. Mineral. 28, 93-109.
23. Redfern, S.A.T. (1996): Length scale dependence of high-pressure amorphization: the static amorphization of anorthite. Mineral. Mag. 60, 493-498.
24. Rossi, G., Oberti, R., Dal Negro, A., Molin, G.M. & Mellini, M. (1987): Residual electron density of the M2 site in C2/c clinopyroxenes: relationships with bulk chemistry and sub-solidus evolution. Phys. Chem. Minerals 14, 514-520.
25. 6). Neues Jahrb. Mineral., Abh. 124, 223-245.
26. Shimobayashi, N. & Kitamura, M. (1991): Phase transition in Ca-poor clinopyroxenes: a high temperature transmission electron microscopic study. Phys. Chem. Minerals 18, 153-160.
27. Smyth, J.R. (1969): Orthopyroxene high-low clinopyroxene inversions. Earth Planet. Sci. Lett. 6, 406-407.
28. Smyth, J.R. (1974): The high temperature crystal chemistry of clinohypersthene. Am. Mineral. 59, 1069-1082.
29. Sueno, S., Kimata, M. & Prewitt, C.T. (1984): The crystal structure of high clinoferrosilite. Am. Mineral. 69, 265-269.
30. Thompson, R.M. & Downs, R.T. (2003): Model pyroxenes. I. Ideal topologies. Am. Mineral. 88, 653-666.
31. Thompson, R.M. & Downs, R.T. (2004): Model pyroxenes. II. Structural variation as a function of tetrahedral rotation. Am. Mineral. 89, 614-628.
32. 6) join. Am. Mineral. 85, 707-715.
33. Tribaudino, M. Benna, P. & Bruno, E. (1989): Average structure and M2 site configurations in C2/c clinopyroxenes along the Di-En join. Contrib. Mineral. Petrol. 103, 452-456.
34. 6). Eur. J. Mineral. 14, 549-555.
35. 6): structural and thermodynamic behavior. Am. Mineral. 87, 648-657.
36. 1/c clinopyroxenes. Phys. Chem. Minerals 30, 527-535.
37. 1/c pigeonites. Mineral. Petrol. 77, 161-176.
38. 6 clinopyroxene. Am. Mineral. 86, 807-813.
39. Weinbruch, S., Styrsa, V. & Müller, W.F. (2003): Exsolution and coarsening in iron-free clinopyroxene during isothermal annealing. Geochim. Cosmochim. Acta 67, 5071-5082.
40. Yang, Hexiong & Prewitt, C.T. (2000): Chain and layer silicates at high temperatures and pressures. In High Temperature and High Pressure Crystal Chemistry (R.M. Hazen & R.T. Downs, eds.). Rev. Mineral. Geochem. 41, 211-255.