Caractérisation des paragenèses et des paléocirculations fluides dans l'indice d'or de Bleı̈da (Anti-Atlas,Maroc)Characterization of the paragenesis and the fluid palaeo-circulations in the gold showings of Bleida (Anti-Atlas,Morocco) |
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| Authors: | Ahmed Barakat Christian Marignac Marie-Christine Boiron Mohamed Bouabdelli |
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| Affiliation: | 1. Département de géologie, faculté des sciences et techniques, BP 523, Béni-Mellal, Maroc;2. École des Mines de Nancy, Parc de Saurupt, 54042 Nancy, France;3. UMR 7566-G2R, Cregu, BP 23, 54501 Vand?uvre-lès-Nancy, France;4. Département de géologie, faculté des sciences Semlalia, BP S15, Marrakech, Maroc |
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| Abstract: | The gold showings at Bleida are hosted in Late Pan-African N50–80 °E quartz–hematite–chlorite 1 tension lenses that are related to the activity of major sinistral sub-east–west thrusts. Ores result from three superimposed stages of fluid migration. Gold occurs in microcracks offsetting the earlier minerals. Fluids evolved from COHN compositions with a saline component to boiling aqueous fluids. Pressure and temperature decreased from 50 MPa and 300 °C to less than 4 MPa and 150 °C. Thus, the gold showings at Bleida were formed in a typical geothermal (epithermal) setting, likely controlled by the Late Pan-African magmatism. To cite this article: A. Barakat et al., C. R. Geoscience 334 (2002) 35–41 |
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| Keywords: | Morocco Bleida lens gold fluid inclusions Maroc Ble??da lentille or inclusions fluides Géomatériaux Métallogénie Geomaterials Ore deposits |
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