IN SITU X-RAY DIFFRACTION STUDIES OF DENSE HYDROUS MAGNESIUM SILICATES AT MANTLE CONDITIONS
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dc.contributor.author | Shieh S.R. | |
dc.contributor.author | Mao H.K. | |
dc.contributor.author | Hemley R.J. | |
dc.contributor.author | Ming L.C. | |
dc.date.accessioned | 2021-01-22T08:38:47Z | |
dc.date.available | 2021-01-22T08:38:47Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=235144 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2000, 177, 1, 69-80 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23532 | |
dc.description.abstract | Lizardite was pressurized up to about 28 and 20 GPa and heated at 1310 (+/-50) and 1100 (+/-100)°C; antigorite was pressurized at about 25 and 22 GPa and heated at ~1000°C, with a Nd:YAG laser using the double-side laser heating technique. Samples were then examined in situ by energy dispersive synchrotron X-ray diffraction. Our results show that phase E, superhydrous phase B, and phase D are indeed dense silicate phases that are stable at high P-T conditions and quenchable to ambient conditions. Some unidentified peaks observed in our runs indicate the existence of unknown hydrous phases. The lattice parameter and bulk modulus of phase E are in good agreement with previous measurements. The linear moduli of the three axes of superhydrous phase B are kao=482 (+/-36) GPa, kbo=544 (+/-62) GPa, and kco=472 (+/-66) GPa and the bulk modulus of superhydrous phase B is 156 (+/-2) GPa. The linear moduli of the three axes of Fe-bearing phase D (phase Dant) are kao=422 (+/-8) GPa and kco=404 (+/-4) GPa and the bulk modulus is 134 (+/-5) GPa, which is ~19% smaller than the Fe-free phase D reported previously. Our results indicate that phase E, superhydrous phase B, and phase D are indeed thermodynamically stable phases at mantle conditions. | |
dc.subject | X-RAY DIFFRACTION DATA | |
dc.subject | PHASE EQUILIBRIA | |
dc.subject | MAGNESIAN SILICATES | |
dc.subject | HIGH PRESSURE | |
dc.title | IN SITU X-RAY DIFFRACTION STUDIES OF DENSE HYDROUS MAGNESIUM SILICATES AT MANTLE CONDITIONS | |
dc.type | Статья |
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