Transformation in garnet from orthorhombic perovskite to LiNbO3 phase on release of pressure

被引：43

作者：

Funamori, N ^{[1
]}

Yagi, T ^{[1
]}

Miyajima, N ^{[1
]}

Fujino, K ^{[1
]}

机构：

[1] HOKKAIDO UNIV,DEPT EARTH & PLANETARY SCI,SAPPORO,HOKKAIDO 060,JAPAN

来源：

SCIENCE | 1997年 / 275卷 / 5299期

关键词：

D O I：

10.1126/science.275.5299.513

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

High-pressure in situ x-ray diffraction and transmission electron microscopy on quenched samples show that natural garnet transforms to orthorhombic perovskite (and minor coexisting phases) containing increasing amounts of aluminum with increasing pressure. This suggests that the perovskite is the dominant host mineral for aluminum in Earth's lower mantle. Orthorhombic perovskite is quenched from similar to 35 gigapascals but, because of the increased aluminum content, transforms to the LiNbO3 structure upon quenching from similar to 60 gigapascals.

引用

页码：513 / 515

页数：3

共 24 条

[1] ELECTRON-MICROSCOPY OF HIGH-PRESSURE PHASES SYNTHESIZED FROM NATURAL GARNETS IN A DIAMOND-ANVIL CELL - IMPLICATIONS FOR THE MINERALOGY OF THE LOWER MANTLE [J].

AHMEDZAID, I ;

MADON, M .

EARTH AND PLANETARY SCIENCE LETTERS, 1995, 129 (1-4) :233-247

[2]

FUNAMORI N, 1994, P 14 AIRAPT C, P791

[3] MEASUREMENT OF THE MELTING CURVE OF MG0.9FE0.1SIO3 AT LOWER MANTLE CONDITIONS AND ITS GEOPHYSICAL IMPLICATIONS [J].

HEINZ, DL ;

JEANLOZ, R .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1987, 92 (B11) :11437-11444

[4] ABSENCE OF AN ALUMINOUS PHASE IN THE UPPER PART OF THE EARTHS LOWER MANTLE [J].

IRIFUNE, T .

NATURE, 1994, 370 (6485) :131-133

[5] An experimental study of the garnet-perovskite transformation in the system MgSiO3-Mg3Al2Si3O12 [J].

Irifune, T ;

Koizumi, T ;

Ando, JI .

PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1996, 96 (2-3) :147-157

[6]

Ito E., 1978, Earth and Planetary Science Letters, V38, P443, DOI 10.1016/0012-821X(78)90119-X

[7]

Ito E., 1977, High-Pressure Research: Applications in Geophysics Eds, P193

[8] PHASE-RELATIONS, STRUCTURE AND CRYSTAL-CHEMISTRY OF SOME ALUMINOUS SILICATE PEROVSKITES [J].

KESSON, SE ;

FITZ GERALD, JD ;

SHELLEY, JMG ;

WITHERS, RL .

EARTH AND PLANETARY SCIENCE LETTERS, 1995, 134 (1-2) :187-201

[9] HIGH-PRESSURE PHASE-TRANSITION IN MNTIO3 FROM THE ILMENITE TO THE LINBO3 STRUCTURE [J].

KO, JD ;

PREWITT, CT .

PHYSICS AND CHEMISTRY OF MINERALS, 1988, 15 (04) :355-362

[10]

LEINENWEBER K, 1994, AM MINERAL, V79, P197

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