Foraminiferal biostratigraphy of the Toarcian deposits (Lower Jurassic) from the Middle Atlas (Morocco). Comparison with western Tethyan areas

被引：28

作者：

Bejjaji, Zohra ^{[2
]}

Chakiri, Said ^{[2
]}

Reolid, Matias ^{[1
]}

Boutakiout, Mohamed ^{[3
]}

机构：

[1] Univ Jaen, Dept Geol, Jaen 23071, Spain

[2] Univ Ibn Tofail, Fac Sci, Dept Geol, Kenitra, Morocco

[3] Univ Mohammed V Agdal, Fac Sci, Dept Geol, Rabat, Morocco

来源：

JOURNAL OF AFRICAN EARTH SCIENCES | 2010年 / 57卷 / 1-2期

关键词：

Foraminifera; Lagenina; Biozonation; Toarcian; Middle Atlas; Correlation; OCEANIC ANOXIC EVENT; MASS EXTINCTION; NW EUROPE; BELEMNITES; DIVERSITY; TRENDS; BASIN;

D O I：

10.1016/j.jafrearsci.2009.08.002

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Toarcian sediments of the Middle Atlas show hemipelagic facies deposited in platform to basinal environments. They are represented by: (a) marly thick sections that accumulated in troughs under restricted dysoxic conditions, and (b) condensed sections of marly limestones found on fairly high ridges. The micropaleontological study of benthic foraminifera allowed us to establish the biostratigraphic extension of the different registered species. From the stratigraphic distribution of the benthic foraminifera two renewal phases can be characterized: one at the base of the Polymorphum Zone, and the other inside the Bifrons Zone. Five biozones were thus established (Lingulina gr. tenera and Marginulina gr. prima Biozone; Lenticulina obonensis mg Planularia Biozone; Lenticulina pennensis mg Marginulinopsis and Ichtyolaria hauffi Biozone; Nodosaria pulchra and Lenticulina ferruginea mg Falsopalmula Biozone; Lenticulina dorbignyi Biozone). These stratigraphic sub-divisions based on the benthic foraminifera are a useful tool when ammonoids are scarce. The Toarcian benthic foraminifera of the Middle Atlas are similar to the foraminiferal associations from neighbouring regions in the Maghreb (Morocco and Algeria) and Southwestern Europe (Spain, France and Portugal). (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：154 / 162

页数：9

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