THE GARNET PERIDOTITES OF THE BENI-BOUSER A MASSIF (MOROCCO) - TECTONIC MIXING AND IRON-MAGNESIUM INTERDIFFUSION

Authors
TABIT A KORNPROBST J WOODLAND AB
Citation
A. Tabit et al., THE GARNET PERIDOTITES OF THE BENI-BOUSER A MASSIF (MOROCCO) - TECTONIC MIXING AND IRON-MAGNESIUM INTERDIFFUSION, Comptes rendus de l'Academie des sciences. Serie II. Sciences de la terre et des planetes, 325(9), 1997, pp. 665-670
Citations number
16
Journal title
Comptes rendus de l'Academie des sciences. Serie II. Sciences de la terre et des planetes → ACNP
ISSN journal
12518050
Volume
325
Issue
9
Year of publication
1997
Pages
665 - 670
Database
ISI
SICI code
1251-8050(1997)325:9<665:TGPOTB>2.0.ZU;2-W
Abstract
The mantle-derived ultramafic massif of Beni Bousera (Morocco) contain s secondary garnet peridotites located at the roof of the body which a re closely associated with spinel peridotites. The garnet peridotites are richer in Fe and poorer in Cr than the spinel peridotites. The sec ondary crystallisation of garnet is not related to an increase in pres sure (subduction) but is instead due to a decrease in temperature and the mechanical dispersion of Fe-rich and Cr-poor garnet pyroxenites wi thin the spinel peridotites. Such a tectonic autocontamination process explains in part the observed isotopic heterogeneities in mantle peri dotites.