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: greenschistHost rock stratigraphy: | Marcona Formation |
|
Related igneous rocks: |
(1) intrusive; gabbro-diorite suite (dykes, porphyritic/glomerophyric); Initials: Ocöite ; Magma series: shoshonitic; Depositional setting: continentalIndividual 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 |
|