The Sidi Mohamed peridotites (Edough Massif, NE Algeria): Evidence for an uppe mantle origin

Journal of Earth system science

Soraya Hadj Zobir1¹  Roland Oberhänsli2² 

[1] Laboratory of Soils and Sustainable Development, Badji Mokhtar-Annaba University, P.O. Box 12, Annaba 23000, Algeria.$$;Department of Earth and Environmental Sciences, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Building 27, Potsdam-Golm 14476, Germany.$$

关键词: Peridotites;    upper mantle;    Edough;    Algeria.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The Hercynian Edough massif is the easternmost crystalline massif of the Algerian coast. It consists of two tectonically superposed units composed of micaschists, gneisses, and peridotite. This study concentrates on the small and isolated Sidi Mohamed peridotite outcrop area (0.03 km2). The Sidi Mohamed peridotite is composed mainly of harzburgites (Mg-rich olivine and orthopyroxene as major minerals). The Ni (2051–2920 ppm), Cr (2368–5514 ppm) and MgO (∼28–35 wt.%) whole-rock composition and the relative depletion in Nb make these harzburgites comparable to depleted peridotites related to a subduction zone. We suggest that the Sidi Mohamed ultramafic body was derived directly from the upper mantle and tectonically incorporated into the gneiss units of the Edough metamorphic core complex in a subduction environment.

【 授权许可】

Unknown