Geobarometry from host-inclusion systems: The role of elastic relaxation

被引：122

作者：

Angel, Ross J. ^{[1
]}

Mazzucchelli, Mattia L. ^{[2
]}

Alvaro, Matteo ^{[1
]}

Nimis, Paolo ^{[1
]}

Nestola, Fabrizio ^{[1
]}

机构：

[1] Univ Padua, Dept Geosci, I-35131 Padua, Italy

[2] Univ Pavia, Dept Earth & Environm Sci, I-27100 Pavia, Italy

来源：

AMERICAN MINERALOGIST | 2014年 / 99卷 / 10期

基金：

欧洲研究理事会;

关键词：

Inclusions; residual stress; elasticity; elastic relaxation; PRESSURE; DIAMOND; EQUILIBRIA; QUARTZ;

D O I：

10.2138/am-2014-5047

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：

Minerals trapped as inclusions within other host minerals can develop residual stresses on exhumation as a result of the differences between the thermo-elastic properties of the host and inclusion phases. The determination of possible entrapment pressures and temperatures from this residual stress requires the mutual elastic relaxation of the host and inclusion to be determined. Previous estimates of this relaxation have relied on the assumption of linear elasticity theory. We present a new formulation of the problem that avoids this assumption. We show that for soft inclusions such as quartz in relatively stiff host materials such as garnet, the previous analysis yields entrapment pressures in error by the order of 0.1 GPa. The error is larger for hosts that have smaller shear moduli than garnet.

引用

页码：2146 / 2149

页数：4

共 20 条

[1]

ADAMS HG, 1975, AM MINERAL, V60, P574

[2] The use of quartz as an internal pressure standard in high-pressure crystallography [J].