Intervention of carbonate components in petrogenesis of the pyroxene nephelinites from the Jbel Saghro (Anti-Atlas, Morocco)

Details

Serval ID
serval:BIB_B6ADF1695725
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Intervention of carbonate components in petrogenesis of the pyroxene nephelinites from the Jbel Saghro (Anti-Atlas, Morocco)
Journal
Bulletin de la Société Géologique de France
Author(s)
Ibhi A., Nachit H., Abia E.H., Hernandez J.
ISSN-L
0037-9409
Publication state
Published
Issued date
2002
Peer-reviewed
Oui
Volume
173
Pages
37-43
Language
english
Notes
ISI:000173819300005
Abstract
The Jbel Saghro alkaline complex was emplaced close to the eastern edge
of the Moroccan Anti-Atlas. Within the northern part, two types of
nephelinite were recognized [Ibhi and Nachit, 1999 and lbhi, 2000].
The first type (olivine-rich nephelinite) constitutes the main volcanic
mass south of the Bou Gafer granit (fig. 1), where the volcanism had
been active at least during 2 Ma, between 9.6 and 7.5 +/- 0.1 Ma
[Berrahma et al., 1993]. The second group outcrops in the north (Foum
El Kouss). It consists of pyroxene nephelinites which are younger (2.9
+/- 0.1 Ma) [Berrahma et al., 1993], and bears carbonatitic xenoliths,
melteigitic pyroxenites and metasomatised peridotite xenoliths.
Geochemically, the pyroxene nephelinite is highly enriched in LILE
compared with the first one. The mineralogical and geochemical
characteristics may be explained by the incorporation of carbonatitic
and melteigitic pyroxenite segregates of carbonatitic affinity.
Create date
11/12/2012 16:25
Last modification date
20/08/2019 16:24
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