THE ACHKAL OLIGOCENE RING COMPLEX - SR, ND PB EVIDENCE FOR TRANSITIONBETWEEN THOLEIITIC AND ALKALI CENOZOIC MAGMATISM IN CENTRAL HOGGAR (SOUTH ALGERIA)

Authors
MAZA M BRIQUEU L DAUTRIA JM BOSCH D
Citation
M. Maza et al., THE ACHKAL OLIGOCENE RING COMPLEX - SR, ND PB EVIDENCE FOR TRANSITIONBETWEEN THOLEIITIC AND ALKALI CENOZOIC MAGMATISM IN CENTRAL HOGGAR (SOUTH ALGERIA), Comptes rendus de l'Academie des sciences. Serie 2. Sciences de la terre et des planetes, 327(3), 1998, pp. 167-172
Citations number
18
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
Comptes rendus de l'Academie des sciences. Serie 2. Sciences de la terre et des planetes → ACNP
ISSN journal
12518050
Volume
327
Issue
3
Year of publication
1998
Pages
167 - 172
Database
ISI
SICI code
1251-8050(1998)327:3<167:TAORC->2.0.ZU;2-R
Abstract
The Achkal Oligocene ring complex cross-cuts the Upper Eocene tholeiit ic traps located on the top of the Hoggar swell. The plutonic rocks ra nge from tholeiitic gabbros to alkali essexites, monzonites and syenit es, whereas the volcanites are restricted to late peralkaline rhyolite s. The affinity change linked to the large isotopic heterogeneities (f rom EM1 to HIMU) suggests that the parental magmas are issued from two distinct mantle sources, first lithospheric then deeper. The Achkal h as recorded the magmatic evolution of the Hoggar hot spot, between Eoc ene and Miocene. ((C) Academie des sciences / Elsevier, Paris.)