HIGH-PRESSURE CRYSTAL STRUCTURE OF KOSMOCHLOR, NACRSI2O6, AND SYSTEMATICS OF ANISOTROPIC COMPRESSION IN PYROXENES
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Origlieri M.J. | |
dc.contributor.author | Downs R.T. | |
dc.contributor.author | Thompson R.M. | |
dc.contributor.author | Pommier C.J.S. | |
dc.date.accessioned | 2022-01-02T07:44:02Z | |
dc.date.available | 2022-01-02T07:44:02Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=7593655 | |
dc.identifier.citation | American Mineralogist, 2003, 88, 7, 1025 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34072 | |
dc.description.abstract | The crystal structure of synthetic kosmochlor, NaCrSi2O6, was studied using single crystal X-ray diffraction at high pressure. A four-pin diamond anvil cell, with 4:1 methanol:ethanol pressure me-dium, was used to achieve pressures to 9.28 GPa. Unit-cell data were collected at 20 pressures, and intensity data were collected at 13 of these pressures. Fitting the P-V data to a third-order Birch-Murnaghan equation yields V0 = 418.84(3) Å 3 , K0 = 134(1) GPa 1 , and K0' = 2.0(3). Anisotropic compression was observed with unit strain axial ratios of 1:1.82:2.08. The CrO6 octahedron has a bulk modulus K0 = 90(16) GPa 1 , while the SiO4 tetrahedron has K0 = 313(55) GPa 1 , both with K0' . 4. An o-type rotation of the O3-O3-O3 linkage was observed with pressure, with O3-O3-O3 de-creasing from 172.8(2)8to 166.1(7)8. Compression in kosmochlor is related to the stacking direc-tions of distorted cubic closest packed O atom monolayers. Unit strain ellipsoids for diopside, hedenbergite, spodumene (C2/c and P21/c), LiScSi2O6 (C2/c and P21/c), clinoenstatite, orthoenstatite, and Mg1.54Li.23Sc.23Si2O6 (Pbcn and P21cn) were generated and discussed in terms of closest packing systematics. A relationship between the anisotropy of compression of olivines and pyroxenes is established. A strategy to determine not only the direction of a stress field in deformed rocks, but also an estimate of the magnitude of stress is discussed in terms of comparing the anisotropy of olivine and pyroxene. | |
dc.subject | CRYSTALLOGRAPHY | |
dc.subject | MINERALOGY | |
dc.subject | kosmochlor | |
dc.title | HIGH-PRESSURE CRYSTAL STRUCTURE OF KOSMOCHLOR, NACRSI2O6, AND SYSTEMATICS OF ANISOTROPIC COMPRESSION IN PYROXENES | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru