When the Continental Crust Melts

被引：302

作者：

Sawyer, Edward W. ^{[1
]}

Cesare, Bernardo ^{[2
]}

Brown, Michael ^{[3
]}

机构：

[1] Univ Quebec, Dept Appl Sci, Chicoutimi, PQ G7H 2B1, Canada

[2] Univ Padua, Dipartimento Geosci, I-35131 Padua, Italy

[3] Univ Maryland, Dept Geol, College Pk, MD 20742 USA

来源：

ELEMENTS | 2011年 / 7卷 / 04期

关键词：

continental crust; partial melting; microstructures; metamorphic petrology; DEFORMATION; EXAMPLE; FLUID;

D O I：

10.2113/gselements.7.4.229

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：

Partial meting of the continental crust has long been of interest to petrologists as a small-scale phenomenon. Mineral assemblages in the cores of old, eroded mountain chains that formed where continents collided show that the continental crust was buried deeply enough to have melted extensively. Geochemical, experimental, petrological and geodynamic modelling now show that when the continental crust melts the consequences are crustal-scale. The combination of melting and regional deformation is critical: the presence of melt on grain boundaries weakens rocks, and weak rocks deform faster, influencing the way mountain belts grow and how rifts propagate. Tectonic forces also drive the movement of melt out of the lower continental crust, resulting in an irreversible chemical differentiation of the crust.

引用

页码：229 / 233

页数：5

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