PSEUDOTACHYLYTES GENERATED DURING SEISMIC FAULTING AND ECLOGITIZATION OF THE DEEP CRUST

被引：229

作者：

AUSTRHEIM, H ^{[1
]}

BOUNDY, TM ^{[1
]}

机构：

[1] UNIV MICHIGAN,DEPT GEOL SCI,ANN ARBOR,MI 48109

来源：

SCIENCE | 1994年 / 265卷 / 5168期

关键词：

D O I：

10.1126/science.265.5168.82

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：

Pseudotachylytes are typically interpreted to have formed by frictional melting during coseismic faulting within the upper to middle crust. Pseudotachylytes in the Bergen arcs of western Norway contain microlites including omphacite, garnet, plagioclase, and quartz. This eclogite facies assemblage is stable at temperatures of about 800 degrees C and pressures of 18 to 19 kilobars, corresponding to depths of 60 kilometers or more. The pseudotachylytes are exposed in Grenvillian granulites that locally underwent fluid-induced eclogitization and corresponding volume reduction of approximately 10 percent during the Caledonian continental collision. The pseudotachylytes may have formed as a result of the rapid relaxation of stresses caused by the eclogitization process.

引用

页码：82 / 83

页数：2

共 26 条

[1] SHEAR DEFORMATION AND ECLOGITE FORMATION WITHIN GRANULITE-FACIES ANORTHOSITES OF THE BERGEN ARCS, WESTERN NORWAY [J].