REE systematics of fluorides, calcite and siderite in peralkaline plutonic rocks from the Gardar Province, South Greenland

Schönenberger, Johannes; Köhler, Jasmin; Markl, Gregor

doi:10.1016/j.chemgeo.2007.10.002

Cited by 83 publications

(32 citation statements)

References 69 publications

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“…Cullers et al, 1973;Lesher et al, 1986;Michard and Albarède, 1986;Möller et al, 2003), has been confirmed by experimental data (London et al, 1988;Webster et al, 1989;Keppler and Wyllie, 1990;. Evidence indicating the association of these elements and F-bearing mineralising fluids has been reported by several authors in different natural systems, including felsic magmatic systems (Gieré, 1986;Charoy and Raimbault, 1994;Audétat et al, 2000;Webster et al, 2004;Schönenberger et al, 2008), metamorphic rocks (Gieré and Williams, 1992;Pan and Fleet, 1996;Rubatto and Hermann, 2003). This paper reports the presence of late-formed aggregates of F-, REE (lanthanides, U, and Th)-, Y-and HFSE (Ti, Zr, and Nb)-rich minerals filling vesicles, micromiarolitic cavities and lithophysal vugs in rhyolitic units of the Gawler Range Volcanics of South Australia.…”

Section: Introductionsupporting

confidence: 63%

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The role of fluorine in the concentration and transport of lithophile trace elements in felsic magmas: Insights from the Gawler Range Volcanics, South Australia

2010

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Keywords:Fluorine Rare earth elements (REE) High field strength elements (HFSE) Late-stage magmatic fluid Rhyolites of the Mesoproterozoic Gawler Range Volcanics (GRV) of South Australia are characterised by high concentrations of some trace elements (REE, Y, HFSE, Rb and F, in particular). Whole rock geochemical data suggest that these elements were incompatible during magma crystallisation. Accessory minerals (fluorite, zircon, REE-F-carbonate, Ti oxide, apatite, and titanite) can account for most of the trace element content of the rocks. These minerals occur in vesicles, micromiaroles, lithophysal vugs and in interstices between major mineral phases (quartz and feldspar as both phenocrysts and groundmass). Such textural evidence indicates that accessory minerals crystallised late in the history of the magma and that they were deposited from a volatile-rich (fluid) phase. These features are explained by the following sequence of events: 1) F dissolved in the magma lowered the crystallisation temperature of accessory minerals, causing trace elements (REE, Y, and HFSE) to behave as incompatible elements. 2) Protracted crystallisation of major mineral phases (quartz, feldspar, and oxides) formed a volatile-and trace element-enriched residual liquid. 3) A volatile element (H 2 O, F, and CO 2 )-rich phase (late-stage magmatic fluid) evolved from the magma. High concentration of fluorine and other complexing agents in this phase allowed trace elements to be transported in solution. 4) Accessory minerals crystallised from such a phase in vesicles, micromiaroles and interstices between the major mineral phases.

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Section: Introductionsupporting

confidence: 63%

“…Gieré, 1986;Webster et al, 1989;Keppler and Wyllie, 1990;Charoy and Raimbault, 1994;Pan and Fleet, 1996;Audétat et al, 2000;Webster et al, 2004;Schönenberger et al, 2008). A mobility of these elements is shown by both experimental studies and evidence from natural systems.…”

Section: Characteristics Of the Late-stage Fluidmentioning

confidence: 94%

The role of fluorine in the concentration and transport of lithophile trace elements in felsic magmas: Insights from the Gawler Range Volcanics, South Australia

2010

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“…On the whole, the LREE/HREE fractionation of hydrothermal carbonates is mainly controlled by the composition of the primary fluid, mineralogy, crystal structure, complexation, coprecipitation of an LREE (MREE or HREE)-enriched phase, and the process of sorption and desorption (Morgan and Wandless, 1980;Bau, 1991;Chesley et al, 1991;Bau and Möller, 1992;Subías and Fernández-Nieto, 1995;Schönenberger et al, 2008). In the following sections, we will briefly examine the possible processes responsible for the MREEand HREE-enriched patterns in calcites.…”

Section: Ree and Fe Mnmentioning

confidence: 99%

“…These minerals are ideal for Sm-Nd dating because they usually contain high amounts of Sm and Nd, and display enrichment of MREE and HREE, corresponding to a large variation in Sm/Nd ratios. As a result, the mechanism of LREE/HREE fractionation of hydrothermal Ca-bearing minerals becomes a considerable scientific interest, and remains controversial (Möller et al, 1976;Morgan and Wandless, 1980;Chesley et al, 1991;Bau and Möller, 1992;Schönenberger et al, 2008). Generally, carbonate shows LREE-enriched, low Sm/Nd ratio and in narrow range (0.1-0.3) (Graf, 1984).…”

Section: Introductionmentioning

confidence: 99%

Sm-Nd geochronology, REE geochemistry and C and O isotope characteristics of calcites and stibnites from the Banian antimony deposit, Guizhou Province, China

et al. 2012

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2001), a full understanding of the geodynamical setting, fluid evolution, and genesis of the epithermal antimony mineralization has been seriously hampered. Similar to other epithermal deposits (including Au, Hg, As and Tl) in southwestern China, the ore-forming ages of antimony deposits are poorly constrained due to the absence of minerals suitable for isotopic dating and the absence of ore-related intrusions in or near these deposits.According to mineral composition of ores and genesis, antimony deposits are subdivided into epithermal (e.g., Xikuangshan and Qinglong, China; Ashat, Roundnjany) and metamorphogene-hydrothermal (Woxi, China; La Lucette, France; Gravelot, South Africa) (Obolensky et al., 2007), and they are usually hosted within black shales or limestones (Williams-Jones and Norman, 1997;An and Zhu, 2010). The Sb-rich sedimentary rocks and metasedimentary rocks from Precambrian and palaeozoic constitute a possible source of Sb (Peng et al., 2003a;Fan et al., 2004;Peng and Frei, 2004 The Banian sediment-hosted antimony deposit is a medium-sized deposit located in the Dushan County, South Guizhou, China. Calcite is the dominant gangue mineral and can be divided into two types: white and pink. Pink calcite is intimately associated with mineralization. Sm-Nd dating of five white calcites yield an isochron age of 128.2 ± 3.2 Ma, with initial ε Nd = -4.3 and MSWD = 0.54, while six pink calcites yield an identical age of 126.4 ± 2.7 Ma with initial ε Nd = -6.0 and MSWD = 0.68. These new age constraints suggest that the Banian deposit formed during the late Yanshanian.Negative initial ε Nd values, C (-0.5 to -1.8), O (12.5 to 14.6) isotopic characteristics of calcites, and field observations of abundance of vuggy open spaces, all suggest significant interaction between fluid and wall rocks. Calcites are characterized by strongly LREE-depleted and MREE-and HREE-enriched (LREE/HREE = 0.11-0.61). Stibnites are LREEenriched, and MREE-and HREE-depleted (LREE/HREE = 105-500). Wall rocks are characterized by moderate LREEenriched (LREE/HREE = 6.2-12). Pink calcites are more enriched in LREE (LREE/HREE = 0.11-0.61) than white calcites (LREE/HREE = 0.11-0.23), while the concentration of HREE remains nearly constant in both. The high contents of Fe and Mn in calcites and the negative correlation between Fe+Mn (ppm) and LREE/HREE ratios suggest that the Fe-Mn impurities in calcites may dominate the enrichment of MREE and HREE in calcites from the Banian deposit.

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“…], який широко використовується в багатьох сучасних галузях народного господарства (металургія, медицина, оптика, атомна енергетика, хімічна промис-ловість тощо [5 та ін.]). Але дедалі частіше з'являються роботи, які ілюструють можливості застосування влас-тивостей флюориту (розподіл REE [4,5,6,9,12,[14][15][16]26 та ін. ], ізотопні співвідношення [8,9,25], колір та люмінесцентні властивості [4, 7, 11, 13, 14 та ін.]…”

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Geochemistry and color of natural fluorites: efficiency and simplicity of practical application in mineralogical and geochemical studies

Lazareva¹

2015

VKNUGEOL

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REE systematics of fluorides, calcite and siderite in peralkaline plutonic rocks from the Gardar Province, South Greenland

Cited by 83 publications

References 69 publications

The role of fluorine in the concentration and transport of lithophile trace elements in felsic magmas: Insights from the Gawler Range Volcanics, South Australia

The role of fluorine in the concentration and transport of lithophile trace elements in felsic magmas: Insights from the Gawler Range Volcanics, South Australia

Sm-Nd geochronology, REE geochemistry and C and O isotope characteristics of calcites and stibnites from the Banian antimony deposit, Guizhou Province, China

Geochemistry and color of natural fluorites: efficiency and simplicity of practical application in mineralogical and geochemical studies

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