SEISMIC IMAGE OF UNDERCRUSTED SERPENTINITE BENEATH A RIFTED MARGIN

被引：27

作者：

BOILLOT, G

BESLIER, MO

COMAS, M

机构：

[1] Laboratoire de Géodynamique Sous-Marine, Villefranche-Sur-Mer, 06230

[2] Instituto Andaluz de Geologia Mediterrenea, Facultad de Ciencias, Granada

来源：

TERRA NOVA | 1992年 / 4卷 / 01期

关键词：

D O I：

10.1111/j.1365-3121.1992.tb00447.x

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

During the continental rifting the upper mantle was unroofed, and the mantle rocks were transformed into serpentinite at the ocean-continent transition of the west Galicia margin (Spain). The serpentinite layer, several km thick, extends probably eastwards, beneath the highly thinned continental crust of the margin. The serpentinite layer was recently imaged by seismic reflection. It is discontinuously and deeply layered. As serpentinized peridotite can have densities and seismic velocities comparable to those of the lower continental crust, we suggest that undercrusting by serpentinite can play a part in building the lower seismic crust in highly stretched continental rifted areas.

引用

页码：25 / 33

页数：9

共 28 条

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