Trace-element composition and zoning in clinopyroxene- and amphibole-group minerals: Implications for element partitioning and evolution of carbonatites

Reguir, Ekaterina P.; Chakhmouradian, Anton R.; Pisiak, Laura K.; Halden, Norman M.; Yang, Panseok; Xu, Cheng; Kynický, Jindřích; Couëslan, Chris G.

doi:10.1016/j.lithos.2011.10.003

Cited by 67 publications

(37 citation statements)

References 49 publications

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“…A signifi cant share of the rare earth budget of carbonatites is dispersed among their major constituent minerals (principally calcite, dolomite, apatite, and amphibole-group minerals; e.g. Reguir et al 2012), whereas the remainder is incorporated in a plethora of REE-rich carbonate, phosphate, oxide, and silicate phases.…”

Section: Carbonatitesmentioning

confidence: 99%

Rare Earth Mineralization in Igneous Rocks: Sources and Processes

2012

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Section: Carbonatitesmentioning

confidence: 99%

Rare Earth Mineralization in Igneous Rocks: Sources and Processes

2012

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“…The scarcity of periclase in carbonatites implies that Mg-rich magnetite or Mg silicates (at higher SiO 2 activities) precipitate in place of this mineral in natural systems (Reguir et al 2008(Reguir et al , 2012.…”

Section: Introductionmentioning

confidence: 99%

Calcite and dolomite in intrusive carbonatites. I. Textural variations

2015

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Carbonatites are nominally igneous rocks, whose evolution commonly involves also a variety of postmagmatic processes, including exsolution, subsolidus re-equilibration of igneous mineral assemblages with fluids of different provenance, hydrothermal crystallization, recrystallization and tectonic mobilization. Petrogenetic interpretation of carbonatites and assessment of their mineral potential are impossible without understanding the textural and compositional effects of both magmatic and postmagmatic processes on the principal constituents of these rocks. In the present work, we describe the major (micro)textural characteristics of carbonatitic calcite and dolomite in the context of magma evolution, fluid-rock interaction, or deformation, and provide information on the compositional variation of these minerals and its relation to specific evolutionary processes.

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“…Experimental and natural melt inclusion studies have demonstrated that HREE and Si will preferentially partition into conjugate silicate melts relative to the carbonate melt during immiscibility (D La/Lu carbonate/silicate melts = 1.3–4.5)1516. Crystal fractionation of dense silicates17 and oxides (such as REE-enriched perovskite and pyrochlore) from carbonatites could decrease the HREE and Si contents of the residual magmas, depending on the mineral composition. Therefore, none of the three petrogenetic models noted above is likely to be responsible for significant HREE enrichment in carbonatites.…”

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Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China

Song

Smith

et al. 2016

Sci Rep

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Carbonatites, usually occurring within intra-continental rift-related settings, have strong light rare earth element (LREE) enrichment; they rarely contain economic heavy REE (HREE). Here, we report the identification of Late Triassic HREE-Mo-rich carbonatites in the northernmost Qinling orogen. The rocks contain abundant primary HREE minerals and molybdenite. Calcite-hosted fluid inclusions, inferred to represent a magmatic-derived aqueous fluid phase, contain significant concentrations of Mo (~17 ppm), reinforcing the inference that these carbonatitic magmas had high Mo concentrations. By contrast, Late Triassic carbonatites in southernmost Qinling have economic LREE concentrations, but are depleted in HREE and Mo. Both of these carbonatite types have low δ26Mg values (−1.89 to −1.07‰), similar to sedimentary carbonates, suggesting a recycled sediment contribution for REE enrichment in their mantle sources. We propose that the carbonatites in the Qinling orogen were formed, at least in part, by the melting of a subducted carbonate-bearing slab, and that 10 Ma younger carbonatite magmas in the northernmost Qinling metasomatized the thickened eclogitic lower crust to produce high levels of HREE and Mo.

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Trace-element composition and zoning in clinopyroxene- and amphibole-group minerals: Implications for element partitioning and evolution of carbonatites

Cited by 67 publications

References 49 publications

Rare Earth Mineralization in Igneous Rocks: Sources and Processes

Rare Earth Mineralization in Igneous Rocks: Sources and Processes

Calcite and dolomite in intrusive carbonatites. I. Textural variations

Origin of unusual HREE-Mo-rich carbonatites in the Qinling orogen, China

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