Publication Type:
Journal ArticleSource:
GeologyGeology, Geological Society of America, Volume 43, Number 6, p.547-550 (2015)ISBN:
00917613Keywords:
Apatite, Cerium compounds, Electron probe microanalysis, Energy dispersive spectroscopy, Fluorine compounds, Granite, Neodymium compounds, rare earths, Scanning electron microscopy, silica, ThoriaAbstract:
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 graphictextured inclusions in the context of models suggested for the formation of graphic quartz-Kfeldspar intergrowths in granitic pegmatites, based on the similarity of these features. 2015 Geological Society of America.
Notes:
Compilation and indexing terms, Copyright 2018 Elsevier Inc.<br/>20152100879897<br/>Carbonatites<br/>Endmembers<br/>Energy dispersive X ray spectroscopy<br/>Granitic pegmatite<br/>Heterogeneous composition<br/>Inter-growths<br/>Light rare earth elements<br/>Saskatchewan , Canada
