STABILITY OF CLINOPYROXENE AT PRESSURE-TEMPERATURE CONDITIONS OF THE TRANSITION REGION

被引：53

作者：

CANIL, D ^{[1
]}

机构：

[1] UNIV BAYREUTH,BAYER GEOINST,D-95440 BAYREUTH,GERMANY

来源：

PHYSICS OF THE EARTH AND PLANETARY INTERIORS | 1994年 / 86卷 / 1-3期

关键词：

D O I：

10.1016/0031-9201(94)05059-7

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The stability of diopside at conditions of 16-19 GPa and 1250-1900 degrees C was determined using a 6-8 type multi-anvil apparatus. At pressures of 17-18 GPa, diopside undergoes a decomposition reaction to an assemblage of CaSiO3-perovskite + (Ca,Mg)SiO3-garnet or -ilmenite, depending on temperature. The Clapeyron slope for the breakdown reaction: [GRAPHICS] is -2 MPa K-1. When coupled with a re-examination of clinopyroxene stability in other more complex peridotite systems, the experimental data are consistent with a recent proposal that the 520 km discontinuity in the transition region is caused by the exsolution of CaSiO3-rich perovskite from garnet, rich in majorite component.

引用

页码：25 / 34

页数：10

共 30 条

[1] OLIVINE-MODIFIED SPINEL-SPINEL TRANSITIONS IN THE SYSTEM MG2SIO4-FE2SIO4 - CALORIMETRIC MEASUREMENTS, THERMOCHEMICAL CALCULATION, AND GEOPHYSICAL APPLICATION [J].