Abstract Details
(2020) Constraining the Conditions of Rare Earth Element Mineralization in the Bear Lodge Alkaline Complex, Wyoming: A Fluid Inclusion Study
Olinger D, Andersen A & Bennett M
https://doi.org/10.46427/gold2020.1991
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Submitted by Kathryn Watts on Thursday 25th June 19:28
Very nice presentation. I was intrigued by the enrichment of Sr and REE in fluorite growth bands in your CL images. Do you have an explanation for the cyclicity? You indicated that most fluid inclusion analyses are from the darker (Sr- and REE-poorer) zones, but some do contain Sr phases. Are the abundances correlated to more or less Sr-rich fluorite growth bands? I see that burbankite was observed as daughter crystals in fluid inclusions, but not the main ore mineral carbonates (bastnasite, parisite). Are the fluorcarbonate ore mineral carbonates mostly related to precipitation from a different fluid source?
Thank you, Kathryn. We are still looking into the cyclicity of the growth banding in the fluorite as these pictures were taken just before our work-from-home orders. We've actually done RAMAN and microthermometry analyses on inclusions in the light and dark growth zones. Thus far, we've had agreement in results between inclusions in light and dark bands (same daughter crystals and Te, Tmice) regardless of their location. Burbankite/calcioburbankite was found as daughter crystals and should be noted that burbankite/calcioburbankite is thought to have been the original REE mineral in this system which later altered to ancylite+ and then bastnaesite group minerals.
Very nice presentation. I was intrigued by the enrichment of Sr and REE in fluorite growth bands in your CL images. Do you have an explanation for the cyclicity? You indicated that most fluid inclusion analyses are from the darker (Sr- and REE-poorer) zones, but some do contain Sr phases. Are the abundances correlated to more or less Sr-rich fluorite growth bands? I see that burbankite was observed as daughter crystals in fluid inclusions, but not the main ore mineral carbonates (bastnasite, parisite). Are the fluorcarbonate ore mineral carbonates mostly related to precipitation from a different fluid source?
Thank you, Kathryn. We are still looking into the cyclicity of the growth banding in the fluorite as these pictures were taken just before our work-from-home orders. We've actually done RAMAN and microthermometry analyses on inclusions in the light and dark growth zones. Thus far, we've had agreement in results between inclusions in light and dark bands (same daughter crystals and Te, Tmice) regardless of their location. Burbankite/calcioburbankite was found as daughter crystals and should be noted that burbankite/calcioburbankite is thought to have been the original REE mineral in this system which later altered to ancylite+ and then bastnaesite group minerals.
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