SPINEL-GARNET LHERZOLITE TRANSITION IN THE SYSTEM CAO-MGO-AL2O3-SIO2 REVISITED: AN IN SITU X-RAY STUDY
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dc.contributor.author | Walter M. | |
dc.contributor.author | Katsura T. | |
dc.contributor.author | Kubo A. | |
dc.contributor.author | Shinmei T. | |
dc.contributor.author | Nishikawa O. | |
dc.contributor.author | Ito E. | |
dc.contributor.author | Lesher C. | |
dc.contributor.author | Funakoshi K. | |
dc.date.accessioned | 2021-04-19T00:50:46Z | |
dc.date.available | 2021-04-19T00:50:46Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1091298 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2002, 66, 12, 2109-2121 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28029 | |
dc.description.abstract | Large discrepancies are reported for the near-solidus, pressure-temperature location of the spinel to garnet lherzolite univariant curve in the system CaO-MgO-Al2O3-SiO2 (CMAS). Experimental data obtained previously from the piston-cylinder apparatus indicate interlaboratory pressure differences of up to 30% relative. To investigate this disparity-and because this reaction is pivotal for understanding upper mantle petrology-the phase boundary was located by means of an independent method. The reaction was studied via in situ X-ray diffraction techniques in a 6-8 type multianvil press. Pressure is determined by using MgO as an internal standard and is calculated from measured unit cell volume by using a newly developed high-temperature equation of state for MgO. Combinations of real-time and quenched-sample observations are used to bracket the phase transition. The transition between 1350 and 1500°C was reversed, and the reaction was further constrained from 1207 to 1545°C. Within this temperature range, the transition has an average dT/dP slope of ~40 +/- 10°C/kbar, consistent with several previous piston-cylinder studies. Extrapolation of our curve to 1575°C, an established temperature of the P-T invariant point, yields a pressure of 25.1 +/- 1.2 kbar. We also obtained a real-time reversal of the quartz-coesite transition at 30.5 +/- 2.3 kbar at 1357°C, which is about 2 to 4 kbar lower in pressure than previously determined in the piston-cylinder apparatus. | |
dc.title | SPINEL-GARNET LHERZOLITE TRANSITION IN THE SYSTEM CAO-MGO-AL2O3-SIO2 REVISITED: AN IN SITU X-RAY STUDY | |
dc.type | Статья |
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