Isosymmetric pressure-induced bonding increase changes compression behavior of clinopyroxenes across jadeite-aegirine solid solution in subduction zones

Xu, Jingui; Zhang, Dongzhou; Fan, Dawei; Downs, Robert T.; Hu, Yi; Dera, Przemyslaw K.

doi:10.1002/2016JB013502

Isosymmetric pressure-induced bonding increase changes compression behavior of clinopyroxenes across jadeite-aegirine solid solution in subduction zones

Journal Article · Wed Nov 23 00:00:00 EST 2016 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1002/2016JB013502· OSTI ID:1355027

Xu, Jingui ^[1]; ^[2]; Fan, Dawei ^[3]; Downs, Robert T. ^[4]; ^[2]; ^[2]

Chinese Academy of Sciences, Guiyang (China); Univ. of Hawai'i at Mānoa, Honolulu HI (United States); Univ. of Chinese Academy of Sciences, Beijing (China)
Univ. of Hawai'i at Mānoa, Honolulu HI (United States)
Chinese Academy of Sciences, Guiyang (China)
Univ. of Arizona, Tucson, AZ (United States)

Pyroxenes are among the most important minerals of Earth's crust and upper mantle and play significant role in controlling subduction at convergent margins. In this study, synchrotron-based single-crystal X-ray diffraction experiments were carried out on a natural aegirine [NaFe³⁺Si₂O₆] sample at ambient temperature and high pressures to 60 GPa, simulating conditions within the coldest part of a subduction zone consisting of old lithosphere. The diffraction data reveal no obvious sign of structural phase transition in aegirine within this pressure range; however, several relevant structural parameter trends change noticeably at approximately 24 GPa, indicating the presence of the previously predicted isosymmetric bonding change, related to increase of coordination number of Na⁺ at M2 site. The pressure-volume data, fit with third-order Birch-Murnaghan (BM3) equation of state over the whole pressure range, yields K_T0 = 126(2) GPa and K'_T0 = 3.3(1), while separate BM3 fits performed for the 0–24.0 GPa and 29.9–60.4 GPa pressure ranges give K_T0 = 118(3) GPa, K'_T0 = 4.2(3) and K_T0 = 133(2) GPa, K'_T0 = 3.0(1), suggesting that the structure stiffens as a result of the new bond formation. Aegirine exhibits strong anisotropic compression with unit strain axial ratios ε₁:ε₂:ε₃ = 1.00:2.44:1.64. Structural refinements reveal that NaO₈ polyhedron is the most compressible and SiO₄ tetrahedron has the lowest compressibility. Lastly, the consequence of bonding transition is that the compressional behavior of aegirine below ~24 GPa and above that pressure is quite different, with likely consequences for relevant thermodynamic parameters and ion diffusion coefficients.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: NSF; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466

OSTI ID:: 1355027

Journal Information:: Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 1 Vol. 122; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Isosymmetric pressure-induced bonding increase changes compression behavior of clinopyroxenes across jadeite-aegirine solid solution in subduction zones

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