NATURAL CATI2O4-STRUCTURED FECR2O4 POLYMORPH IN THE SUIZHOU METEORITE AND ITS SIGNIFICANCE IN MANTLE MINERALOGY
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dc.contributor.author | Chen M. | |
dc.contributor.author | Shu J. | |
dc.contributor.author | Xie X. | |
dc.contributor.author | Mao H.K. | |
dc.date.accessioned | 2021-12-29T04:38:04Z | |
dc.date.available | 2021-12-29T04:38:04Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=5070786 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2003, 67, 20, 3937-3942 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33925 | |
dc.description.abstract | The first natural occurrence of a high-pressure polymorph of chromite has been discovered in the shock-metamorphosed Suizhou meteorite. The composition of this high-pressure polymorph is identical to that of the precursor chromite. The Raman spectrum of this polymorph is distinct from that of chromite. Synchrotron X-ray diffraction analysis revealed that this polymorph has an orthorhombic CaTi2O4- type structure. The cell parameters are: a = 9.462(6) A, b = 9.562(9) A, c = 2.916(1) A, V = 263.8(4) A3 (Z=4), space group = Bbmm, and the density = 5.63 g/cm3 (the numbers in parentheses are standard deviations on the last significant digits). This polymorph is 11.5% denser than chromite. The P-T conditions for the phase transformation from chromite to the CaTi2O4-structured polymorph are estimated at 20-23 GPa and 1800 to 2000 °C, respectively. This dense CaTi2O4-structured FeCr2O4 phase could be a host phase for Cr, Al, Fe, Mg and Mn and other metallic elements in the deep Earth. | |
dc.title | NATURAL CATI2O4-STRUCTURED FECR2O4 POLYMORPH IN THE SUIZHOU METEORITE AND ITS SIGNIFICANCE IN MANTLE MINERALOGY | |
dc.type | Статья |
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