Nanometer-size α-PbO2-type TiO2 in garnet:: A thermobarometer for ultrahigh-pressure metamorphism

被引：153

作者：

Hwang, SL

Shen, PY ^{[1
]}

Chu, HT

Yui, TF

机构：

[1] Natl Sun Yat Sen Univ, Inst Mat Sci & Engn, Kaohsiung 80424, Taiwan

[2] I Shou Univ, Dept Mat Sci & Engn, Kaohsiung, Taiwan

[3] Cent Geol Survey, Taipei, Taiwan

[4] Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan

来源：

SCIENCE | 2000年 / 288卷 / 5464期

关键词：

D O I：

10.1126/science.288.5464.321

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：

A high-pressure phase of titanium dioxide (TiO2) with an alpha-PbO2-type structure has been identified in garnet of diamondiferous quartzofeldspathic rocks from the Saxonian Erzgebirge, Germany. Analytical electron microscopy indicates that this alpha-PbO2-type TiO2 occurred as an epitaxial nanometer-thick slab between twinned rutile bicrystals. Given a V-shaped curve for the equilibrium phase boundary of alpha-PbO2-type TiO2 to rutile, the stabilization pressure of alpha-PbO2-type TiO2 should be 4 to 5 gigapascals at 900 degrees to 1000 degrees C. This suggests a burial of continental crustal rocks to depths of at Least 130 kilometers. The alpha-PbO2-type TiO2 may be a useful pressure and temperature indicator in the diamond stability field.

引用

页码：321 / 324

页数：4

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