Graphic-textured inclusions in apatite; evidence for pegmatitic growth in a REE-enriched carbonatitic system

Graphic texture, most common in felsic pegmatites, is documented here in an unusual setting, within apatite of the Hoidas Lake light rare earth element (LREE) deposit, an inferred distal pegmatitic-hydrothermal counterpart of a carbonatite in northern Saskatchewan, Canada. The graphic texture is dis...

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Bibliographic Details
Published in:Geology (Boulder) 2015-06, Vol.43 (6), p.547-550
Main Authors: Pandur, Krisztina, Ansdell, Kevin M, Kontak, Daniel J
Format: Article
Language:English
Subjects:
apatite
Canada
carbonatites
crystal growth
EDS spectra
electron probe data
enrichment
Freshwater
granites
graphic texture
Hoidas Lake
Hoidas Lake Deposit
igneous and metamorphic rocks
Igneous rocks
inclusions
metal ores
metallogeny
mineral composition
mineral deposits, genesis
mineral exploration
pegmatite
Petrology
phosphates
plutonic rocks
rare earth deposits
Saskatchewan
Scanning electron microscopy
Sedimentation & deposition
spectra
Spectrum analysis
textures
Trace elements
Western Canada
X-ray spectra
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Summary:Graphic texture, most common in felsic pegmatites, is documented here in an unusual setting, within apatite of the Hoidas Lake light rare earth element (LREE) deposit, an inferred distal pegmatitic-hydrothermal counterpart of a carbonatite in northern Saskatchewan, Canada. The graphic texture is displayed by vermicular and cuneiform LREE-rich inclusions which define primary growth zones in apatite. Integrated electron microprobe analysis and scanning electron microscope-energy dispersive X-ray spectroscopy imaging document the unusual and heterogeneous compositions of the inclusions, which vary between Ce2O3 + SiO2 (+ ThO2)-dominant and La2O3 + Nd2O3 (+ F)-dominant end members. Here we discuss the formation of these graphic-textured inclusions in the context of models suggested for the formation of graphic quartz-K-feldspar intergrowths in granitic pegmatites, based on the similarity of these features.
ISSN:0091-7613
1943-2682
DOI:10.1130/G36613.1