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New insights into the evolution and age of the Neoproterozoic Jebel Ohier porphyry copper deposit, Red Sea Hills, northeastern Sudan

Frank P. Bierlein, Warren Potma, Federico Cernuschi, Carl Brauhart, Jamie Robinson, Chris J. Bargmann, Warwick Bullen, Jose F. Henriquez, Ian Davies and Allen Kennedy
New insights into the evolution and age of the Neoproterozoic Jebel Ohier porphyry copper deposit, Red Sea Hills, northeastern Sudan
Economic Geology and the Bulletin of the Society of Economic Geologists (January 2020) 115 (1): 1-31

Abstract

New SHRIMP U-Pb data from dioritic to granodioritic syn-mineral intrusions associated with the Jebel Ohier porphyry copper deposit (mineral inventory, including NI43-101-compliant total inferred and indicated resources, of 593 million tonnes [Mt] at 0.33% Cu and 0.05 ppm Au, for 1.953 Mt of contained Cu and 933,600 oz of Au at 0.15% Cu cutoff) in the Red Sea Hills of northeastern Sudan have bracketed the age of mineralization to ca. 816 to 812 Ma. This age range, as well as constraints from new and existing lithogeochemical data, is consistent with the deposit's formation from a productive parental magma source during the early stages in the evolution of an intra-Mozambique Ocean island arc. The Jebel Ohier porphyry copper deposit bears many similarities to well-documented Phanerozoic analogues elsewhere in terms of (1) the mapped style and zonation of hydrothermal alteration (i.e., proximal K-silicate-dominated, to sericitic, to distal propylitic alteration), (2) the occurrence of intense Cu-bearing A- and B-type vein stockwork, as well as sulfide-only C-type veins, anhydrite veins, and younger, peripheral D-type veins, and (3) the geochemical fingerprint of the associated porphyry, which is akin to those of ore-related Tertiary porphyries in the Escondida area in northern Chile. The multiphase intrusion hosting the Jebel Ohier porphyry copper deposit has been intruded by several generations of mafic to felsic postmineralization dikes and voluminous plutons, with a peak in magmatic activity coinciding with the suturing of the Gebeit terrane at ca. 724 Ma. In spite of, or perhaps because of, the occurrence of extensive postmineralization magmatism, and regardless of subsequent deformation, regional metamorphism, uplift, and erosion, the deposit has remained remarkably intact. The discovery of a relatively ancient, yet well-preserved porphyry copper deposit in the Neoproterozoic Arabian-Nubian Shield has major implications for the exploration potential of this resource-rich geologic terrain.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 115
Serial Issue: 1
Title: New insights into the evolution and age of the Neoproterozoic Jebel Ohier porphyry copper deposit, Red Sea Hills, northeastern Sudan
Affiliation: QMSD Mining Company, Khartoum, Sudan
Pages: 1-31
Published: 20200101
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 75
Accession Number: 2020-006876
Categories: Economic geology, geology of ore depositsStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 3 tables, geol. sketch maps
N19°00'00" - N21°00'00", E35°00'00" - E36°00'00"
Secondary Affiliation: CSA Global Pty., AUS, AustraliaQatar Mining, QAT, QatarCurtin University, John de Laeter Centre, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202006
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