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Neoarchean and Paleoproterozoic iron oxide-copper-gold events at the Sossego Deposit, Carajas Province, Brazil; Re-Os and U-Pb geochronological evidence

C. P. N. Moreto, L. V. S. Monteiro, R. P. Xavier, R. A. Creaser, S. A. DuFrane, C. C. G. Tassinari, K. Sato, A. I. S. Kemp and W. S. Amaral
Neoarchean and Paleoproterozoic iron oxide-copper-gold events at the Sossego Deposit, Carajas Province, Brazil; Re-Os and U-Pb geochronological evidence
Economic Geology and the Bulletin of the Society of Economic Geologists (May 2015) 110 (3): 809-835

Abstract

The Sossego iron oxide-copper-gold (IOCG) deposit is situated within the WNW-ESE-trending Canaa shear zone in the southern Copper belt, Carajas province, Brazil. The Sossego deposit consists of two major groups of orebodies (Sequeirinho-Pista-Baiano and Sossego-Curral). The Sequeirinho-Pista-Baiano orebodies are characterized by deep-emplaced magnetite-(apatite) and albite-actinolite-rich zones, whereas the Sossego-Curral orebodies have predominant potassic and chlorite alteration typical of shallow crustal levels. U-Pb (SHRIMP IIe and LA-ICPMS) geochronology on host rocks reveals Mesoarchean (3.08 Ga Xingu Complex, ca. 2.99 Ga Sequeirinho Granite and 2.97 Ga Pista felsic metavolcanic rock) and bimodal Neoarchean (ca. 2.74 Ga Sossego granophyric granite, Curral Granite and gabbronorite) units. Dating of hydrothermal monazite (U-Pb LA-MC-ICPMS) and molybdenite (Re-Os NTIMS) of the Sequeirinho-Pista orebodies rendered ages of ca. 2.71 to 2.68 Ga, while ore-related monazite of the Sossego-Curral orebodies yielded ages of ca. 1.90 to 1.88 Ga. The Neoarchean IOCG-forming events reflect coupling of ductile sinistral transpression with NNE-directed oblique shortening and Neoarchean magmatism (ca. 2.7 Ga). The shallow-emplaced Paleoproterozoic system, formed after progressive exhumation of the deep-emplaced Neoarchean IOCG deposits, coincides in age with the emplacement of 1.88 Ga A-type granites: the latter may have caused regional circulation of magmatic and externally derived fluids along crustal discontinuities, favoring copper-gold ore deposition as well as metallogenic diversity in the Carajas province (e.g., Sn, W, Au-Pd-Pt deposits).


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 110
Serial Issue: 3
Title: Neoarchean and Paleoproterozoic iron oxide-copper-gold events at the Sossego Deposit, Carajas Province, Brazil; Re-Os and U-Pb geochronological evidence
Affiliation: University of Campinas, Institute of Geosciences, Campinas, Brazil
Pages: 809-835
Published: 201505
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 89
Accession Number: 2015-051875
Categories: Economic geology, geology of ore depositsGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix; a digital suppl. to this paper is avail. at http://economicgeology.org/ and at http://econgeol.geoscienceworld.org/
Illustration Description: illus. incl. block diags., sects., 4 tables, geol. sketch map
S07°45'00" - S05°30'00", W51°04'60" - W49°00'00"
Secondary Affiliation: University of Sao Paulo, BRA, BrazilUniversity of Alberta, CAN, CanadaUniversity of Western Australia, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201524
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