PRELIMINARY GEOCHRONOLOGICAL DATA ON ALKALINE VOLCANISM OF JBEL-SAGHRO, ANTI-ATLAS (MOROCCO)

被引：28

作者：

BERRAHMA, M

DELALOYE, M

FAUREMURET, A

RACHDI, HEN

机构：

[1] Ecole Normale Supérieure de Rabat, Maroc

[2] Département de Minéralogie, Université de Genève, Suisse

[3] Laboratoire de géologie historique, Université de Paris-Sud

来源：

JOURNAL OF AFRICAN EARTH SCIENCES | 1993年 / 17卷 / 03期

关键词：

D O I：

10.1016/0899-5362(93)90077-4

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Jbel Saghro is one of the two late Cenozoic, large volume strato-volcano of the so-called Anti-Atlas. Saghro (east) and Siroua (west) lie within a zone of local extension but in a regional context of compression, related to a major E-W fault system that defines the southern rim of the Haut-Atlas. The tectonic regime is trans-tensional. Lavas composition range from olivine nephelinites to phonolithes, but major and trace element criteria permit distinctions between one group which includes only phonolites versus a separate more diverse group which includes nephelinites and phonolites. K-Ar dating of 22 whole rock samples demonstrate a temporal-spatial progression from early volcanism in the center of the area (10-6.4 Ma) to activity focused in the northern part of the complex (5.5-2.8 Ma; includes the youngest eruption). The sequence is successively more evolved from nephelinite through tephrite to phonolite, but the younger, northern sequence is confined to olivine-nephelinites.

引用

页码：333 / 341

页数：9

共 22 条

[1]

Berrahma, Le volcanisme mio-pliocène de la partie nord-ouest du massif du Siroua (Anti-Atlas central, Maroc): étude structurale et pétrologique, Thèse de 3e cycle, Université Paris XI, (1982)

[2]

Berrahma, Hernandez, Nouvelles données sur le volcanisme trachytique hyperalcalin du volcan du Siroua (Anti-Atlas, Maroc), C. R. Acad. Sc. Paris, 300, II, 17, pp. 863-868, (1985)

[3]

Berrahma, Etude pétrologique des laves récentes du massif du Siroua (Anti-Atlas, Maroc), (1989)

[4]

Berrahma, Delaloye, Données géochronologiques nouvelles sur le massif volcanique du Siroua (Anti-Atlas, Maroc), J. Afr. Earth. Sci., 9, 3-4, pp. 651-656, (1989)

[5]

Choubert, Siginification tectonique du Siroua, Bull. Soc. Nat. Maroc, Rabat, 22, pp. 123-136, (1942)

[6]

Choubert, L'accident majeur de l'Anti-Atlas, C. R. Acad. Sc. Paris, 244, pp. 1172-1173, (1947)

[7]

Choubert, Marcais, Géologie du Maroc (aperçu structural), Notes et Mém Serv. géol. Maroc. Rabat, 100, (1952)

[8]

Choubert, Historie géologique de l'Anti-Atlas de l'Archéen à l'aurore des temps primaires, Notes et Mém. Serv. géol. Maroc, Rabat, (1963)

[9]

Delaloye, Wagner, Potassium-Argon dating: an automatic equipement with digital output for computer processing, C. R. Soc. Phys. Hist. Nat. Genève, 9, pp. 66-74, (1974)

[10]

De Sitter, Koomans, Heetweld, Les phonolites du Djebel Saghro (Maroc occidental), Geol. Mynbow, Amsterdam, 14, 8, pp. 267-276, (1952)

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