The Jebel Ohier deposit—a newly discovered porphyry copper–gold system in the Neoproterozoic Arabian–Nubian Shield, Red Sea Hills, NE Sudan

Autor: C. J. Bargmann, Carl W. Brauhart, Frank P. Bierlein, H. Al-Athbah, W. Bullen, F. C. Murphy, S. McKeag, Sebastien Meffre, Stafford McKnight, W. Potma, N. Reynolds
Rok vydání: 2015
Předmět:
Zdroj: Mineralium Deposita. 51:713-724
ISSN: 1432-1866
0026-4598
DOI: 10.1007/s00126-015-0630-z
Popis: Ongoing exploration in the Red Sea Hills of NE Sudan has led to the identification of a large alteration–mineralization system within a relatively undeformed Neoproterozoic intrusive–extrusive succession centered on Jebel Ohier. The style of mineralization, presence of an extensive stockwork vein network within a zoned potassic-propylitic-argillic-advanced argillic-altered system, a mineralization assemblage comprising magnetite-pyrite-chalcopyrite-bornite (±gold, silver and tellurides), and the recurrence of fertile mafic to intermediate magmatism in a developing convergent plate setting all point to a porphyry copper–gold association, analogous to major porphyry Cu–Au–Mo deposits in Phanerozoic supra-subduction settings such as the SW Pacific. Preliminary U–Pb age dating yielded a maximum constraint of c. 730 Ma for the emplacement of the stockwork system into a significantly older (c. 800 Ma) volcanic edifice. The mineralization formed prior to regional deformation and accretion of the host terrane to a stable continental margin at by c. 700 Ma, thus ensuring preservation of the deposit. The Jebel Ohier deposit is interpreted as a relatively well-preserved, rare example of a Neoproterozoic porphyry Cu–Au system and the first porphyry Cu–Au deposit to be identified in the Arabian–Nubian Shield.
Databáze: OpenAIRE
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