CANADIAN AND WORLD MINERAL DEPOSIT DATABASES
Geological Survey of Canada


 
Database name: World Fe-oxide+/-Cu-Au-U (IOCG) deposits
Compilers: Sunil S. Gandhi
Release date: 2015-03-03
   
Deposit name(s): E-Grid; Mina 4; Marcona
Longitude / Latitude: -75.09306 / -15.19583
Political location(s): Peru; Province or state: Ica; Nearest community: Lima (400 km SE)
Deposit clan (type): Kiruna-type
Deposit status: past producer; Size category: > 1500 Mt (production + resources); Status comments: Main deposit of a groupof nine; mining commenced in 1953 and has continued sincet; the mine presently operated by the Chinese state owned Shougang Hierro Perú. The average grade is 60 % Fe.
Geologic province: Andean Orogen
Geologic subprovince: Coastal Cordillera
Geologic district: Cañete-Huarmey Marginal Basin
Commodities: Fe; Cu
Mineralization styles: stratabound concentrations
Geological ages: Early Paleozoic (host rocks)
Middle Jurassic (mineralization)
Coincident features: stratabound
Regional tectonic structure: NNW-trending fault marking the east boundary of Coastal Andean Range (major fault that controlled Jurassic igneous activity; ancient fault with an early dextral transcurrent movement and later normal displacement) Tectonic structure name: Treinta Libras Fault
Host rocks: (1) sedimentary; mudstone-carbonate-sandstone-chert (chert laminations in marbles); Magma series/sedimentary package/metamorphic group: platform-shelf sediments; Depositional setting: shallow marine; Metamorphic grade: greenschist
Host rock stratigraphy:Marcona Formation
Related igneous rocks: (1) intrusive; gabbro-diorite suite (dykes, porphyritic/glomerophyric); Initials: Ocöite ; Magma series: shoshonitic; Depositional setting: continental
Individual lithologies:mafic dykes (characterized by aggregates of plagioclase, up to 1.5 cm in diameter, recording multiple magmatic dissolution/overgrowth events)
Alteration signatures: albitization: albite; What was altered: host rock
chloritization: chlorite; What was altered: host rock
sericitization: sericite, clay; What was altered: host rock
serpentinization: serpentine; What was altered: host rock
Mineralogy: (alteration): albite, sericite, chlorite, k-feldspar, tourmaline, scapolite (marialite), talc, zeolite, marcasite
(gangue): Ca-amphibole, clinopyroxene, titanite, apatite, garnet, biotite
(mineralization): magnetite, specularite, matite, pyrite, pyrrhotite, chalcopyrite, bornite, chalcocite, pentlandite, sphalerite, galena, molybdenite, gold
Radiometric ages: Age - Ma: 157; +3; -3; Dating method: Ar-Ar; Concentrate: amphibole; Source rock: ore zone; Event dated: alteration (hypogene); Interpretive comment: The radimetric date corresponds to the volcanic activity of late-Río Grande Formation; Reference: Injoque, J.; Atkin, B.; Harvey, P.; Snelling, N., 1988: Mineralogía y Geochronología del Skarn Geotermal de Hierro de Marcona; Boletín de la Sociedad Geológica del Perú, p. 65 - 80
Deposit shape: lensoid
tabular
References:
Atchley, F., 1956
Geology of the Marcona Iron Deposits, Peru
Ph. D. Thesis, Stanford University, California, U.S.A.

Hawkes, N.; Clark, A.; Moody, T. C., 2002
Marcona and Pampa de Pongo: Giant Mesozoic Fe-(Cu, Au) Deposits in the Peruvian Coastal Belt
Section The Americas, in Hydrothermal Iron Oxide Copper-Gold and Related Deposits: A Global Perspective, Volume 2, Edited by Porter, T. M., Australian Mineral Foundation, Adelaide, Australia, PGC Publishing, Adelaide, 377 p, p. 115 - 130

Injoque, J.; Atkin, B.; Harvey, P.; Snelling, N., 1988
Mineralogía y Geochronología del Skarn Geotermal de Hierro de Marcona
Boletín de la Sociedad Geológica del Perú, p. 65 - 80

Injoque, J., 2002
Fe Oxide-Cu-Au Deposits in Peru: An Integrated View
Section The Americas, in Hydrothermal Iron Oxide Copper-Gold and Related Deposits: A Global Perspective, Volume 2, Edited by Porter, T. M., Australian Mineral Foundation, Adelaide, Australia, PGC Publishing, Adelaide, 377 p, p. 97 - 114

Sillitoe, 2003
Iron Oxide-Copper-Gold Deposits: An Andean View
Mineralium Deposita, Volume 38, p. 787 - 812


Generated 2015-03-03 11:26:04 with GQuery -- 3.7 ADO (3.19..3.22 -- 2008-12-16)
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