NATURAL HIGH-PRESSURE POLYMORPH OF MERRILLITE IN THE SHOCK VEINS OF THE SUIZHOU METEORITE
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dc.contributor.author | Xie X. | |
dc.contributor.author | Minitti M.E. | |
dc.contributor.author | Chen M. | |
dc.contributor.author | Mao H.O.K. | |
dc.contributor.author | Wang D. | |
dc.contributor.author | Shu J. | |
dc.contributor.author | Fei Y. | |
dc.date.accessioned | 2021-04-19T02:32:53Z | |
dc.date.available | 2021-04-19T02:32:53Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1094208 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2002, 66, 13, 2439-2444 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28050 | |
dc.description.abstract | A new high-pressure polymorph of merrillite with the structure of trigonal γ-Ca3(PO4)2 was found in the shock-produced veins of the Suizhou meteorite, where it coexists with ringwoodite, majorite, NaAlSi3O8-hollandite, and majorite-pyrope garnet. The crystallographic nature of this natural γ-Ca3(PO4)2 phase was characterized by Raman spectroscopy and X-ray diffraction, and all data compare favorably to the same data obtained from γ-Ca3(PO4)2 synthesized at 14 GPa and 1400°C. The cell parameters of this new high-pressure mineral are a = 5.258(1) angstroms and c = 18.727(3) angstroms, space group R-3m, and density = 3.447 (g/cm3), where the number in parentheses are standard deviations in the last significant digits. The natural occurrence of the γ-Ca3(PO4)2 phase together with other high-pressure minerals constrains the pressure of the shock veins at about 23 GPa. The Suizhou meteorite provides the first naturally occurring example of γ-Ca3(PO4)2 polymorph. | |
dc.title | NATURAL HIGH-PRESSURE POLYMORPH OF MERRILLITE IN THE SHOCK VEINS OF THE SUIZHOU METEORITE | |
dc.type | Статья |
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