MD12A:
Mafic-Ultramafic Magmatic Ore Deposits II

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Session Title - en français: Gisements mafiques et ultramafiques d'origine magmatique

Session ID#: 5965

Session Description:
The formation of economic concentration of chromite, Ni-Cu-Co sulfides, PGE, Fe-Ti-V-P ore (ilmenite, magnetite, apatite) and REE minerals is the result of multiple potential processes, including fractional crystallization and accumulation, mineral sorting, magma mixing, assimilation and immiscibility. These magmatic massive to disseminated ore deposits are the crystallization products of a range of magma compositions including ultramafic and mafic basalts (from komatiites to evolved ferrobasalts), alkali-basalts and carbonatites. They are most commonly emplaced in continental flood basalts, layered intrusions and alkaline igneous complexes. This session aims to integrate recent developments in the study of ore forming processes based on field work and mapping, petrography of ore rocks (textures, CSD, 3D computed tomography), geochemistry (rock and mineral chemistry, stable and radiogenic isotopes, element mapping), experimental petrology and theoretical modelling.
OSPA Liaison:  Olivier Namur, Leibniz Universität Hannover, Institut für Mineralogie, Hannover, Germany
Chairs:  Bernard Charlier, University of Liège, Department of Geology, Sart Tilman, Belgium and Olivier Namur, Leibniz Universität Hannover, Institut für Mineralogie, Hannover, Germany
Primary Convener:  Bernard Charlier, University of Liège, Department of Geology, Sart Tilman, Belgium
Convener:  Olivier Namur, Leibniz Universität Hannover, Institut für Mineralogie, Hannover, Germany
Index Terms:

1036 Magma chamber processes [GEOCHEMISTRY]
1065 Major and trace element geochemistry [GEOCHEMISTRY]
3640 Igneous petrology [MINERALOGY AND PETROLOGY]
3665 Mineral occurrences and deposits [MINERALOGY AND PETROLOGY]
Co-Sponsor(s):
  • VGP - Volcanology, Geochemistry, and Petrology

Abstracts Submitted to this Session:

MD12A-01
Role of liquid immiscibility in the generation of magmatic Fe-P-O deposits (Invited) (35011)
James Mungall1, James M Brenan2, Kristy Long1, Duane J Smythe3 and H Richard Naslund4, (1)Univ Toronto, Toronto, ON, Canada, (2)University of Toronto, Toronto, ON, Canada, (3)University of Oxford, Oxford, United Kingdom, (4)Binghamton University, Binghamton, NY, United States
MD12A-02
Iron-Rich Ultramafic Pegmatites of the Bushveld Complex, South Africa and Their Relationships with the UG2 Platiniferous Chromitite Layer (33800)
Ilya V Veksler, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany; Technical University Berlin, Department of Mineralogy, Berlin, Germany and David A Reid, University of British Columbia, Vancouver, BC, Canada
MD12A-03
ULTRAMAFIC HOSTED NI-CU-PGE DEPOSITS IN THE SEILAND IGNEOUS PROVINCE (SIP) NORWAY: ORE-FORMING PROCESSES AT THE ROOTS OF A GIANT MAGMATIC CONDUIT SYSTEM (34106)
Rune B Larsen1, Markku Iljina2, Thomas Grant1 and Mona Schanche3, (1)NTNU, Trondheim, Norway, (2)Markku Iljina GeoConsulting Oy, Rovaniemi, Finland, (3)Nordic Mining ASA, Oslo, Norway
MD12A-04
Ni-Cu-PGE Mineralizations within a Komatiitic Subvolcanic and Volcanic Succession in the Mesoarchean Venus Greenstone Belt, Superior Province, Northern Québec, Canada (35932)
François Huot1, Michel G Houlé2, Vital Pearson3 and Paul Archer3, (1)Laval University, Earth sciences, Québec, QC, Canada, (2)Geological Survey of Canada, Québec, Canada, (3)Mines Virginia Inc., Quebec, QC, Canada
MD12A-06
Extreme Variations in ɣOs, on the Thin Section Scale in Laurites from Chromite Layers from Stillwater Complex: Implications for the Origin of Laurite and the Representativeness of Whole Rock ɣOs. (34846)
Laurene Wavrant1, Sarah-Jane Barnes1, Philippe Pagé1, Norman Pearson2 and William L Griffin2, (1)Sciences de la Terre, Université du Québec à Chicoutimi (UQAC), Chicoutimi, Canada, (2)Macquarie University, Department of Earth and Planetary Sciences, Sydney, Australia
MD12A-07
Sulfide Distribution and Oxygen Isotopic Variation Within the J-M Reef, Stillwater Complex, Montana (34581)
Matthew Lilley, Edward Michael Ripley and Chusi Li, Indiana University, Geosciences, Bloomington, IN, United States
MD12A-08
Multiple Sulfur Isotope Studies of the Stillwater Complex, Montana (35734)
Anne Michelle Ayre, Edward Michael Ripley and Chusi Li, Indiana University, Geosciences, Bloomington, IN, United States
See more of: Mineral Deposits and Ore Minerals