Ore systems with IOA, IOCG, IOU and affiliated deposits





Ore systems with IOA, IOCG, IOU and affiliated deposits

L. Corriveau (Geological Survey of Canada), E. Potter (Geological Survey of Canada), D. Harlov (GFZ), X.-F. Zhao (China University of Geosciences)

Leaders and affiliations : L. Corriveau (Geological Survey of Canada), E. Potter (Geological Survey of Canada), D. Harlov (GFZ), X.-F. Zhao (China University of Geosciences)

Contact : [email protected]

Description : Iron oxide and alkali-calcic alteration systems host iron oxide-apatite (IOA), iron oxide copper-gold (IOCG), iron oxide-uranium (IOU) and polymetallic skarns and albitite-hosted deposits and their REE, Co, Bi, Mo, Re and U variants. They are characterized by unique fluids, melts and fluid-rock reactions that generate polymetallic ores and diagnostic metasomatic rocks. The course provides an overview of the geological, mineralogical, structural and geochemical attributes of these ore systems and their magmatic and tectonic contexts using the Great Bear magmatic zone (for its stunning exposures) and global reference settings (e.g., the Olympic Cu-Au province, Chinese examples and the Andes). Observations on the space-time relationships among deposits and alteration facies will be reconciled with current understanding of fluids, melts (including iron oxide and salt melts) and metasomatic reactions to further knowledge on mineralization paths from depth to surface. The mineral potential of significantly under-explored North American and Chinese settings, such as those of the Great Bear magmatic zone, Central Mineral belt, Grenville Province, Kangdian and Xinjiang districts, and Middle-Lower Yangtze River metallogenic belt, is then addressed through comparison with mining districts of the Olympic Cu-Au province and the Andes. Finally the course reviews the footprint of a Grenvillian case example metamorphosed to granulite facies to optimize exploration of Precambrian terranes in Canada and globally.

Specific topics include:

1) Definition, classification, distribution, timing, and examples of iron oxide-apatite±REE (IOA), iron oxide copper-gold (IOCG) and their affiliated Co, Bi, and Mo variants, skarns, and albitite-hosted U and Au-Co-U deposits;

2) Alteration facies, regional to deposit footprints, and prograde, retrograde, telescoped, and cyclical reaction paths with examples from Australia, North and South America, and Asia, specifically including:
• the Great Bear magmatic zone, Central Mineral Belt, Romanet Horst and Grenville Province in Canada;
• the Olympic Cu-Au province in Australia;
• the Missouri district in the United States;
• the Kangdian, Xinjiang and Middle–Lower Yangtze River districts in China; and
• the Central Andes in Peru;

3) Fluid and heat sources, including the role of coeval magmatism and evaporites on ore genesis;

4) The behavior of saline fluids and saline melts, including their impact on coupled dissolution and reprecipitation processes involving ore deposit minerals and their microfracturing;

5) Known and prospective settings in Canada and China, the spectrum of their deposit types, and the challenges facing new ore discovery;

6) Examples of metamorphosed ore systems and how their IOCG footprints can be discriminated from those of other deposit types that have been metamorphosed to high grades; and

7) Strategies and tools for mapping and exploration.

Sample collections from Canadian, Chinese and Chilean districts will be available for hands-on activities.

Pedro Acosta-Góngora, Louise Corriveau, Eric Potter, Geological Survey of Canada
Huayong Chen, Chinese Academy of Sciences, Guangzhou, China
Adrian Fabris, Geological Survey of South Australia
Daniel Harlov, Deutsches GeoForschungs Zentrum – GFZ, Potsdam, Germany
Jean-François Montreuil, Red Pine Exploration
Tobias U. Schlegel, RWTH Aachen University
Xin-Fu Zhao, China University of Geosciences, Wuhan, China

Number of participants (Min/Max) : 10/70

Language : english

Duration : 2 days

Date : May 11-12, 2019

Price : 150$/student and 600$/professional

Associated theme : Resources, Energy and Environment

Associated Secial session/Field trip : Ore systems within IOA, IOCG, skarn and polymetallic albitite-hosted deposit, a symposium in memory of Dr. Patrick Williams (SY-RE5)

Under the patronage of the Mineral Deposit Division of the Geological Association of Canada