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TitleInvestigation of three Fe-Ti oxide deposits associated with Grenvillian anorthosite massifs as potential source for lunar analogue ilmenite
AuthorMorisset, C -E; Williamson, M -C; Hipkin, V
SourceCanadian Journal of Earth Sciences vol. 50, 2013 p. 64-77, https://doi.org/10.1139/e2012-059 (Open Access)
Year2013
Alt SeriesEarth Sciences Sector, Contribution Series 20120122
PublisherCanadian Science Publishing
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceQuebec
NTS22E; 31G/01
AreaSandford Lake; Canada; United States
Lat/Long WENS-74.0000 -70.0000 50.0000 44.0000
Subjectsigneous and metamorphic petrology; mineral deposits; iron geochemistry; titanium geochemistry; ilmenite; iron oxides; anorthosites; petrographic analyses; hematite; Grenville Province; Degrosbois deposit; Sanford Lake deposits; Adirondack anorthosite massif; Mirepoix deposit; Morin anorthosite
Illustrationsanalyses
ProgramGeology and metallogeny subdivision, GSC Central Canada Division
AbstractTerrestrial ilmenite has been assessed for its suitability in the preparation of a simulant of lunar high-Ti mare regolith, which is needed to test oxygen production on the lunar surface during future missions. Petrographic observations using optical and electron microscopes revealed that ilmenite grains in the Mirepoix, Sanford Lake, and Degrosbois Fe-Ti oxide deposits from Grenvillian anorthosite massifs contain hercynite in their rims but that hematite exsolution is absent in three of eight studied samples. Electron microprobe analyses showed that the ilmenite grains vary in TiO2 from 38.82 to 52.34 wt.%; in FeO from 33.15 to 45.88 wt.%; in Fe2O3 (calculated from stoichiometry) from 2.18 to 27.03 wt.%; in MgO from 0.05 to 2.49 wt.%; and in MnO from 0.26 to 1.51 wt.% and are thus comparable in composition to lunar ilmenite. Ilmenite, free of hematite, in two samples was homogeneous in composition (e.g., sample SL1: 50.4 - 51.4 wt.% TiO2). Two sub-solidus reactions occurred amongst the oxide minerals in the studied deposits: (i) exsolution of hercynite in magnetite; and (ii) reaction between the hematite component in the ilmenite and the ulvöspinel component of the magnetite, forming new ilmenite, which includes the hercynite. The reaction between the hematite component in the ilmenite and the ulvöspinel component of the magnetite, when conditions are favorable for diffusion, produces ilmenite grains that are homogenous in composition and free of hematite exsolution. Ilmenite with little or no Fe3+ may occur in massive, fine-grained, and metamorphosed Fe-Ti oxide deposits and provide a terrestrial analogue source of ilmenite useful for the production of lunar mare simulant.
GEOSCAN ID291506