Iron bacteria in Devonian carbonates (Tafilalt, Anti-Atlas, Morocco)

被引：25
|
作者：
Preat, Alain [1 ]
El Hassani, Ahmed [2 ]
Mamet, Bernard [1 ]
机构：
[1] Univ Libre Bruxelles, Dept Sci Terre & Environm, B-1050 Brussels, Belgium
[2] Univ Mohammed Agdal, Inst Sci, Rabat 10106, Morocco
来源：
FACIES | 2008年 / 54卷 / 01期
关键词：
Devonian; red pigmentation; iron bacteria; Morroco;
D O I：
10.1007/s10347-007-0124-2
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
A condensed Mid-Upper Devonian succession of the Tafilalt (Anti-Atlas) contains numerous red carbonate intervals. Bioclastic tempestites form a transition between an outer shelf and a hemipelagic setting. The red pigmentation is not related to the abundance of detrital iron oxides, but to the presence of iron bacteria and fungi. They form bioconstructions remarkably similar to those previously described in the Jurassic Ammonitico Rosso from Italy and Spain. Thus, dysaerobic microenvironments are proposed and not oxic conditions for these Fe-poor sediments.
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页码：107 / 120
页数：14
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