Age and depositional environment of the Draa Sfar massive sulfide deposit, Morocco

Moreno, C., Sáez, R., Gonzáles, F., Almodóvar, G., Tosano, M., Playford, G., Alansari, A., Rziki, S. and Bajddi, A. (2008) Age and depositional environment of the Draa Sfar massive sulfide deposit, Morocco. Mineralium Deposita, 43 8: 891-911. doi:10.1007/s00126-008-0199-x


Author Moreno, C.
Sáez, R.
Gonzáles, F.
Almodóvar, G.
Tosano, M.
Playford, G.
Alansari, A.
Rziki, S.
Bajddi, A.
Title Age and depositional environment of the Draa Sfar massive sulfide deposit, Morocco
Journal name Mineralium Deposita   Check publisher's open access policy
ISSN 0026-4598
1432-1866
Publication date 2008-11-01
Sub-type Article (original research)
DOI 10.1007/s00126-008-0199-x
Open Access Status
Volume 43
Issue 8
Start page 891
End page 911
Total pages 21
Editor Bernd Lehmann
Patrick Williams
Place of publication Berlin, Germany
Publisher Springer
Language eng
Subject C1
970104 Expanding Knowledge in the Earth Sciences
040311 Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy)
Abstract The Draa Sfar mineralization consists of two main stratabound orebodies, Sidi M’Barek and Tazacourt, located north and south of the Tensift River (“Oued Tessift”), respectively. Each orebody is comprised by at least two massive sulfide lenses. The hosting rocks are predominantly black shales, although minor rhyolitic rocks are also present in the footwall to the southern orebody. Shales, rhyolitic volcanic rocks, and massive sulfides are all included into the Sarhlef Series, which is recognized as one of the main stratigraphic units of the Moroccan Variscan Meseta. Hydrothermal activity related with an anomalous thermal gradient, together with a high sedimentation rate in a tectonically driven pull-apart marine basin, favored the accumulation of organic-rich mud in the deepest parts of the basin and the sedimentary environment suitable for massive sulfide deposition and preservation. This took place by replacement of the hosting unlithified wet mud below the sediment–water interface. Geochemical data suggest a sedimentary environment characterized by oxic water column and anoxic sediment pile with the redox boundary below the sediment–water interface. The low oxygen availability within the sediment pile inhibited oxidation and pyritization of pyrrhotite. Biostratigraphic analysis, based on the palynological content of the hosting black shales, restricts the age of the sulfides to the Asbian substage (mid-Mississippian). This age is consistent with earlier geochronological constraints.
Keyword Draa Sfar
Massive sulfide deposits
Black shales
Biostratigraphy
Morocco
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Mon, 20 Apr 2009, 04:35:08 EST by Ms Christine Sinclair on behalf of School of Earth Sciences