Experimental investigation of large-ion-lithophile-element-, high-field-strength-element- and rare-earth-element-partitioning between calcic amphibole and basaltic melt: the effects of pressure and oxygen fugacity

2000 ◽  
Vol 140 (2) ◽  
pp. 233-250 ◽  
Author(s):  
Claude Dalpé ◽  
Don R. Baker
Keyword(s):  
Experimental Investigation ◽  
Rare Earth ◽  
Field Strength ◽  
Oxygen Fugacity ◽  
High Field ◽  
Earth Element ◽  
High Field Strength ◽  
Calcic Amphibole ◽  
Element Partitioning ◽  
Basaltic Melt

scholarly journals Supplemental Material: Quantifying metasomatic high-field-strength and rare-earth element transport from alkaline magmas

2021 ◽  
Author(s):  
Krzysztof Sokół ◽  
et al.
Keyword(s):  
Rare Earth ◽  
Field Strength ◽  
High Field ◽  
Earth Element ◽  
Estimation Method ◽  
Model Description ◽  
High Field Strength ◽  
Data Standardization ◽  
Element Transport ◽  
Alkaline Magmas

Petrographic information, parameterization of the Grant model, description of the HFSE tonnage estimation method, and supplemental tables of whole-rock data, standardization, and HFSE volume-tonnage calculations.<br>

scholarly journals Supplemental Material: Quantifying metasomatic high-field-strength and rare-earth element transport from alkaline magmas

2021 ◽  
Author(s):  
Krzysztof Sokół ◽  
et al.
Keyword(s):  
Rare Earth ◽  
Field Strength ◽  
High Field ◽  
Earth Element ◽  
Estimation Method ◽  
Model Description ◽  
High Field Strength ◽  
Data Standardization ◽  
Element Transport ◽  
Alkaline Magmas

Petrographic information, parameterization of the Grant model, description of the HFSE tonnage estimation method, and supplemental tables of whole-rock data, standardization, and HFSE volume-tonnage calculations.<br>

scholarly journals Quantifying metasomatic high-field-strength and rare-earth element transport from alkaline magmas

Geology ◽  
2021 ◽  
Author(s):  
Krzysztof Sokół ◽  
Adrian A. Finch ◽  
William Hutchison ◽  
Jonathan Cloutier ◽  
Anouk M. Borst ◽  
...  
Keyword(s):  
Rare Earth ◽  
Field Strength ◽  
Rare Earth Element ◽  
High Field ◽  
Earth Element ◽  
Chemical Interaction ◽  
Hydrothermal Systems ◽  
Initial Reaction ◽  
High Field Strength ◽  
Alkaline Magmas

Alkaline igneous rocks host many global high-field-strength element (HFSE) and rare-earth element (REE) deposits. While HFSEs are commonly assumed to be immobile in hydrothermal systems, transport by late-stage hydrothermal fluids associated with alkaline magmas is reported. However, the magnitude of the flux and the conditions are poorly constrained and yet essential to understanding the formation of REE-HFSE ores. We examined the alteration of country rocks (“fenitization”) accompanying the emplacement of a syenite magma at Illerfissalik in Greenland, through analysis of changes in rock chemistry, mineralogy, and texture. Our novel geochemical maps show a 400-m-wide intrusion aureole, within which we observed typically tenfold increases in the concentrations of many elements, including HFSEs. Textures suggest both pervasive and structurally hosted fluid flow, with initial reaction occurring with the protolith’s quartz cement, leading to increased permeability and enhancing chemical interaction with a mixed Ca-K-Na fenitizing fluid. We estimated the HFSE masses transferred from the syenite to the fenite by this fluid and found ~43 Mt of REEs were mobilized (~12% of the syenite-fenite system total rare-earth-oxide [TREO] budget), a mass comparable to the tonnages of some of the world’s largest HFSE resources. We argue that fenite can yield crucial information about the tipping points in magma evolution because retention and/or loss of volatile-bonded alkali and HFSEs are key factors in the development of magmatic zirconosilicate-hosted HFSE ores (e.g., Kringlerne, at Ilímaussaq), or the formation of the syenite-hosted Nb-Ta-REE (Motzfeldt-type) roof-zone deposits.

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