Special Issue "Iron Oxide-Copper-gold (IOCG) Deposits"

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Deposits".

Deadline for manuscript submissions: closed (20 April 2019)

Special Issue Editor

Guest Editor
Prof. Fernando Henriquez

Departamento de Ingeniería en Minas, Facultad de Ingeniería, Universidad de Santiago de Chile, Chile
Website | E-Mail
Interests: economic geology; mineralogy, geochemestry; volcanology; metalogenesis; ore petrology; ore deposits exploration; iron ore magma; IOA and IOCG deposits

Special Issue Information

Dear Colleagues,

The discovery of the Olympic Dam, and its definition as a new type of copper deposit with important resources and other commodities (Fe, Au, U) and Iron Oxide-Copper-Gold (IOCG) deposits, has caused great interest in formation processes and characteristic guidelines that are useful for their exploration. New discoveries have emphasized a hydrothermal origin of these deposits but the metal source, and especially the relationship with IOA (Iron oxide-apatite, or Kiruna type) deposits, are still discussed. This Special Issue aims to bring together new discoveries, studies in the areas of mineralogy, alteration, genesis, classification and structural control, and to review the current state-of-the-art in terms of knowledge. We welcome studies from all these areas, including new geological models and exploration guides.

Prof. Fernando Henriquez
Guest Editor

Manuscript Submission Information

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Keywords

  • IOCG
  • IOA
  • Kiruna
  • genesis
  • classification
  • characteristics
  • alteration
  • magnetite
  • hematite
  • sulfides
  • breccias

Published Papers (1 paper)

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Research

Open AccessFeature PaperArticle
Silician Magnetite from the Copiapó Nordeste Prospect of Northern Chile and Its Implication for Ore-Forming Conditions of Iron Oxide–Copper–Gold Deposits
Minerals 2018, 8(11), 529; https://doi.org/10.3390/min8110529
Received: 20 September 2018 / Revised: 4 November 2018 / Accepted: 9 November 2018 / Published: 14 November 2018
PDF Full-text (2728 KB) | HTML Full-text | XML Full-text
Abstract
Silica-bearing magnetite was recognized in the Copiapó Nordeste prospect as the first documented occurrence in Chilean iron oxide–copper–gold (IOCG) deposits. The SiO2-rich magnetite termed silician magnetite occurs in early calcic to potassic alteration zones as orderly oscillatory layers in polyhedral magnetite [...] Read more.
Silica-bearing magnetite was recognized in the Copiapó Nordeste prospect as the first documented occurrence in Chilean iron oxide–copper–gold (IOCG) deposits. The SiO2-rich magnetite termed silician magnetite occurs in early calcic to potassic alteration zones as orderly oscillatory layers in polyhedral magnetite and as isolated discrete grains, displaying perceptible optical differences in color and reflectance compared to normal magnetite. Micro-X-ray fluorescence and electron microprobe analyses reveal that silician magnetite has a significant SiO2 content with small amounts of other “impure” components, such as Al2O3, CaO, MgO, TiO2, and MnO. The oscillatory-zoned magnetite is generally enriched in SiO2 (up to 7.5 wt %) compared to the discrete grains. The formation of silician magnetite is explained by the exchange reactions between 2Fe (III) and Si (IV) + Fe (II), with the subordinate reactions between Fe (III) and Al (III) and between 2Fe (II) and Ca (II) + Mg (II). Silician magnetite with high concentrations of SiO2 (3.8–8.9 wt %) was similarly noted in intrusion-related magmatic–hydrothermal deposits including porphyry- and skarn-type deposits. This characteristic suggests that a hydrothermal system of relatively high-temperature and hypersaline fluids could be a substantial factor in the formation of silician magnetite with high SiO2 contents. Full article
(This article belongs to the Special Issue Iron Oxide-Copper-gold (IOCG) Deposits)
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