Sr-rich minerals in a carbonatite skarn, Fuerteventura, Canary Islands (Spain)

Ahijado, A.; Casillas, Ramón; Nagy, Géza; Fernández, Carlos

doi:10.1007/s00710-005-0074-8

Cited by 31 publications

(6 citation statements)

References 16 publications

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“…F on O4, however, would not explain the low sum of M cations. There is also a deficit of positive charges (with all Fe as ferric) in some analytical data of "epidote-(Sr)" reported by Ahijado et al (2005) (e.g., analysis Nr. 8).…”

Section: Appendixmentioning

confidence: 89%

Recommended nomenclature of epidote-group minerals

Armbruster

Bonazzi

Akasaka

et al. 2006

ejm

258

170

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The key cation-sites M3 and A1 (and, in principle, M2) determine the root name. In both clinozoisite and allanite subgroups no prefix is added to the root name if M1 = Al. The prefixes ferri, mangani, chromo, and vanado indicate dominant Fe 3+ , Mn 3+ , Cr 3+ , and V 3+ on M1, respectively. In the dollaseite subgroup no prefix is added to the root name if M1 = Mg. Otherwise a proper prefix must be attached; the prefixes ferro and mangano indicate dominant Fe 2+ and Mn 2+ at M1, respectively. The dominant cation on A2 (other than Ca) is treated according to the Extended Levinson suffix designation. This simple nomenclature requires renaming of the following approved species: Niigataite (old) = clinozoisite-(Sr) (new), hancockite (old) = epidote-(Pb) (new), tweddillite (old) = manganipiemontite-(Sr) (new). Minor modifications are necessary for the following species: Strontiopiemontite (old) = piemontite-(Sr) (new), androsite-(La) (old) = manganiandrosite-(La) (new). Before a mineral name can be assigned, the proper subgroup has to be determined. The determination of a proper subgroup is made by the dominating valence at M3, M1, and A2 expressed as M 2+ and or M 3+ , not by a single, dominant ion (i.e., Fe 2+ , or Mg, or Al). In addition, the dominant valence on O4: X -or X 2-must be ascertained. The dominant trivalent cation on M3 determines the name, whereas the A2 cation appearing in the suffix has to be selected from among the divalent cations. (2) Allanite and dollaseite subgroups: For the sites involved in the charge compensation of a heterovalent substitution in A2 and O4 (i.e. M3 in the allanite subgroup; M3 and M1 in the dollaseite subgroup), identification of the relevant end-member formula must take into account the dominant divalent charge-compensating octahedral cation (M 2+ ) and not the dominant cation in these sites.Formal guidelines and examples are provided in order to determine a mineral "working name" from electron-microprobe analytical data.

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Section: Appendixmentioning

confidence: 89%

Recommended nomenclature of epidote-group minerals

Armbruster

Bonazzi

Akasaka

et al. 2006

ejm

258

170

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“…In general, outcrops related with the FBC intrusive assemblage exhibit significant variations and four distinct morphologies and characteristic textures can be identified (Fúster et al, 1968;Barrera et al, 1986; Le Bas et al, 1986;Fernández et al, 1997;Mangas et al, 1992Mangas et al, , 1994Mangas et al, , 1997Ahijado 1999;Ancochea et al, 2004;Ahijado et al, 2005;Muñoz et al, 2005): https://doi.org/10.5194/egusphere-2024-183 Preprint. Discussion started: 28 February 2024 c Author(s) 2024.…”

Section: The Fuerteventura Basal Complexmentioning

confidence: 99%

“…(4) Contact metamorphism and metasomatism produced by late pyroxenite intrusions, as well as skarn zones that occur in deformed or undeformed carbonatites, influenced by subsequent hydrothermal fluid circulation (Ahijado et al, 2005;Casillas et al, 2008Casillas et al, , 2011.…”

Section: The Fuerteventura Basal Complexmentioning

confidence: 99%

Rare earth element resources on Fuerteventura, Canary Islands, Spain: a geochemical and mineralogical approach

Campeny,

Menéndez,

Quevedo

et al. 2024

Preprint

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Abstract. Rare earth elements (REEs) play a pivotal role in the ongoing energy and mobility transition challenges. Given their critical importance, governments worldwide and especially from the European Union, are actively promoting the exploration of REE resources. In this context, alkaline magmatic rocks (including trachytes, phonolites, syenites, melteigites and ijolites), carbonatites and their associated weathering products were subjected to a preliminary evaluation as potential targets for REE exploration on Fuerteventura Island (Canary Archipelago, Spain) based on mineralogical and geochemical studies. These lithologies show significant REE concentrations. However, only carbonatites exhibit the potential to host economically viable REE mineral deposits. REE concentrations in carbonatites of up to 10,301.83 ppm REY (REEs plus yttrium) have been detected, comparable to other locations hosting significant deposits of these critical elements worldwide. Conversely, alkaline magmatic rocks and the resulting weathering products display limited REE enrichment. Notably, REEs in carbonatites are associated with primary accessory phases such as REE-bearing pyrochlore and britholite, and secondary monazite. The carbonatites of Fuerteventura hold promise as prospective REE deposits within a non-conventional geological setting (oceanic island). However, due to intricate structural attributes and possible land use constraints, additional future detailed investigations are imperative to ascertain their genuine economic viability as substantial REE resources.

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“…The brecciated quartz samples all remain in cluster 3, along with mainly light- Strontium ( 38 Sr) was detected at trace amounts. It is a lithophile element that can substitute for calcium ( 20 Ca) in sulphates, feldspars, mica and clays (Banner, 1995;Ahijado et al, 2005), which might be one explanation for its presence in cluster 1 in model B. Nearly all samples with strontium ( 38 Sr) are located in cluster 2 in model A.…”

Section: Xrfmentioning

confidence: 99%