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Controls on Gold Deposits in Hoggar, Tuareg Shield (Southern Algeria)

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Controls on Gold Deposits in Hoggar, Tuareg Shield (Southern Algeria) Accepted Manuscript Controls on gold deposits in Hoggar, Tuareg Shield (Southern Algeria) Djamal-Eddine Aissa, Christian Marignac PII: S1464-343X(16)30284-9 DOI: 10.1016/j.jafrearsci.2016.09.002 Reference: AES 2660 To appear in: Journal of African Earth Sciences Received Date: 29 January 2016 Revised Date: 17 August 2016 Accepted Date: 2 September 2016 Please cite this article as: Aissa, D.-E., Marignac, C., Controls on gold deposits in Hoggar, Tuareg Shield (Southern Algeria), Journal of African Earth Sciences (2016), doi: 10.1016/ j.jafrearsci.2016.09.002. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT 1 CONTROLS ON GOLD DEPOSITS INHOGGAR, TUAREG SHIELD (Southern Algeria ) 2 3 AISSA Djamal-Eddine 1 and MARIGNAC Christian 2 4 1 Labo de Métallogénie, USTHB, Algiers,Algeria, 2 UMR Géoressources, Univ. Lorraine, Nancy - 5 France 6 7 8 Abstract 9 The Hoggar shield belongs to the 3000 km-long Pan-African Trans-Saharan belt that was formed 10 in the Neoproterozoic, between 750 and 500 Ma by continental collision between the converging 11 West African craton, Congo craton and Saharan Metacraton.More than 600 gold occurrences 12 have been identified by ORGM, which are confined along North-South Pan-African megashear 13 zones stretching some hundreds of kilometres long. MANUSCRIPTUntil now, no global classification and mineral 14 paragenesis characterisation have been proposed for the Hoggar’s gold mineralization. In this 15 paper, we briefly review the main gold mineralization, in order to classify them and to highlight 16 their characteristics andcontrols. According to field work , spectral, microscopic and 17 microthermometric studies, these mineralization can be globally classified asorogenic type shear 18 zone, which can subdivided into three main sub-types according to the degree of their 19 relationships with the major Pan-African shear zones : (i)Ultramylonite-mylonite hosted including 20 Tirek and Amesmessa,ACCEPTED world class deposits; (ii)Granite hosted, including Tekouyat occurrence (iii) 21 Volcano-sediment hosted including Tiririne and In Abbegui deposits . 22 All the deposits are coeval and were formed at the end of the post-collisional stage (530-520 23 Ma). InHoggar, gold mineralization depend on a double control, first order giant sub-meridian 24 shear zone control and the gold districts disposed in N40°-50°E corridors that may be interpreted 1 Download English Version: https://daneshyari.com/en/article/5785758 Download Persian Version: https://daneshyari.com/article/5785758 Daneshyari.com.
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