New geochronological and isotopic data on the Cenozoic volcanism of Ahaggar (southern Algeria):: evidence for a mantle plume.

被引：35

作者：

Aït-Hamou, F

Dautria, JM

Cantagrel, JM

Dostal, J

Briqueu, L

机构：

[1] Univ Montpellier 2, Isteem, UMR 5568, Lab Tectonophys, F-34095 Montpellier 5, France

[2] Univ USTHB Houari Boumedienne, IST, Dept Geol, Alger, Algeria

[3] Univ Clermont Ferrand 2, UMR 6524, F-63038 Clermont Ferrand, France

[4] St Marys Univ, Dept Geol, Halifax, NS B3H 3C3, Canada

[5] Univ Montpellier 2, Isteem, UMR 5567 CNRS, Lab Geochim Isotop, F-34095 Montpellier 5, France

来源：

COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DE LA TERRE ET DES PLANETES | 2000年 / 330卷 / 12期

关键词：

Cenozoic volcanism; (Sr; Nd; Pb); isotopes; dating; Ahaggar; Algeria;

D O I：

10.1016/S1251-8050(00)00217-2

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Taharaq district is located exactly at the centre of the gravity anomaly associated with the Ahaggar swell and comprises Upper Eocene (34 Ma) tholeiitic traps. By comparison, the other volcanic districts of Ahaggar are younger (Mio-Plio-Quaternary), of alkali affinity, and are located on the swell flanks. The isotopic signature of tholeiites shows that they derive from a heterogeneous mantle dominated by a lithospheric component near the EM1 endmember. The subsequent alkali lavas are characterized by isotopic enrichment in radiogenic Nd and Pb, suggesting participation of a near HIMU component of possible plume origin. (C) 2000 Academic des sciences / Editions scientifiques et medicales Elsevier SAS.

引用

页码：829 / 836

页数：8

共 28 条

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