Silicate-carbonate-salt liquid immiscibility and origin of the sodalite-haüyne rocks: study of melt inclusions in olivine foidite from Vulture volcano, S. Italy

Panina, L. I.; Stoppa, Francesco

doi:10.2478/v10085-009-0036-1

Cited by 9 publications

(3 citation statements)

References 32 publications

(37 reference statements)

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“…Doroshkevich et al, 2010;Xie et al, 2015), and sulphate melt generated by immiscibility in the late stages of magmatic crystallisation has been identified in numerous melt inclusion studies (e.g. Andreeva et al, 1998;Panina, 2005;Panina and Motorina, 2008;Panina and Stoppa, 2009). Equally, sulphate-rich fluids within carbonatite-related hydrothermal systems are widespread, with barite and celestine as common accessories in carbonatite systems (e.g.…”

Section: Wider Implicationsmentioning

confidence: 99%

The origin of secondary heavy rare earth element enrichment in carbonatites: Constraints from the evolution of the Huanglongpu district, China

Smith

Kynický

et al. 2018

Lithos

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The silico-carbonatite dykes of the Huanglongpu area, Lesser Qinling, China, are unusual in that they are quartzbearing, Mo-mineralised and enriched in the heavy rare earth elements (HREE) relative to typical carbonatites. The textures of REE minerals indicate crystallisation of monazite-(Ce), bastnäsite-(Ce), parisite-(Ce) and aeschynite-(Ce) as magmatic phases. Burbankite was also potentially an early crystallising phase. Monazite-(Ce) was subsequently altered to produce a second generation of apatite, which was in turn replaced and overgrown by britholite-(Ce), accompanied by the formation of allanite-(Ce). Bastnäsite and parisite where replaced by synchysite-(Ce) and röntgenite-(Ce). Aeschynite-(Ce) was altered to uranopyrochlore and then pyrochlore with uraninite inclusions. The mineralogical evolution reflects the evolution from magmatic carbonatite, to more silica-rich conditions during early hydrothermal processes, to fully hydrothermal conditions accompanied by the formation of sulphate minerals. Each alteration stage resulted in the preferential leaching of the LREE and enrichment in the HREE. Mass balance considerations indicate hydrothermal fluids must have contributed HREE to the mineralisation. The evolution of the fluorcarbonate mineral assemblage requires an increase in a Ca 2+ and a CO 3 2− in the metasomatic fluid (where a is activity), and breakdown of HREE-enriched calcite may have been the HREE source. Leaching in the presence of strong, LREE-selective ligands (Cl − ) may account for the depletion in late stage minerals in the LREE, but cannot account for subsequent preferential HREE addition. Fluid inclusion data indicate the presence of sulphate-rich brines during alteration, and hence sulphate complexation may have been important for preferential HREE transport. Alongside HREE-enriched magmatic sources, and enrichment during magmatic processes, late stage alteration with non-LREE-selective ligands may be critical in forming HREE-enriched carbonatites.

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Section: Wider Implicationsmentioning

confidence: 99%

The origin of secondary heavy rare earth element enrichment in carbonatites: Constraints from the evolution of the Huanglongpu district, China

Smith

Kynický

et al. 2018

Lithos

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“…Knowledge of the composition and evolution of the primary magma(s) responsible for their crystallization is essential in understanding their petrogenesis. The study of primary melt inclusions is a powerful tool to determine such melt compositions (Le Bas and Aspden 1981;Roedder 1987;Veksler and Lentz 2006;Solovova et al 2006;Guzmics et al 2008Guzmics et al , 2011Mitchell 2009;Panina and Stoppa 2009). These melt inclusion studies and those of natural examples (Le Bas 1977;Nielsen 1980;Hay 1983;Kogarko et al 1991;Dawson et al 1994;Mitchell 2005) together with numerous experimental studies (Koster van Groos and Wyllie 1968;Hamilton et al 1979;Kjarsgaard and Peterson 1991;Wyllie 1997, 1998;Brooker and Kjarsgaard 2010) suggest that liquid immiscibility might play a major role in the formation of carbonatites.…”

Section: Introductionmentioning

confidence: 99%

Liquid immiscibility between silicate, carbonate and sulfide melts in melt inclusions hosted in co-precipitated minerals from Kerimasi volcano (Tanzania): evolution of carbonated nephelinitic magma

Guzmics

Mitchell

Szabó

et al. 2012

Contrib Mineral Petrol

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The evolution of a carbonated nephelinitic magma can be followed by the study of a statistically significant number of melt inclusions, entrapped in coprecipitated perovskite, nepheline and magnetite in a clinopyroxene-and nepheline-rich rock (afrikandite) from Kerimasi volcano (Tanzania). Temperatures are estimated to be 1,100°C for the early stage of the melt evolution of the magma, which formed the rock. During evolution, the magma became enriched in CaO, depleted in SiO 2 and Al 2 O 3 , resulting in immiscibility at *1,050°C and crustal pressures (0.5-1 GPa) with the formation of three fluidsaturated melts: an alkali-and MgO-bearing, CaO-and FeO-rich silicate melt; an alkali-and F-bearing, CaO-and P 2 O 5 -rich carbonate melt; and a Cu-Fe sulfide melt. The sulfide and the carbonate melt could be physically separated from their silicate parent and form a Cu-Fe-S ore and a carbonatite rock. The separated carbonate melt could initially crystallize calciocarbonatite and ultimately become alkali rich in composition and similar to natrocarbonatite, demonstrating an evolution from nephelinite to natrocarbonatite through Ca-rich carbonatite magma. The distribution of major elements between perovskite-hosted coexisting immiscible silicate and carbonate melts shows strong partitioning of Ca, P and F relative to Fe T , Si, Al, Mn, Ti and Mg in the carbonate melt, suggesting that immiscibility occurred at crustal pressures and plays a significant role in explaining the dominance of calciocarbonatites (sövites) relative to dolomitic or sideritic carbonatites. Our data suggest that Cu-Fe-S compositions are characteristic of immiscible sulfide melts originating from the parental silicate melts of alkaline silicate-carbonatite complexes.

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“…The pyroclasts are also enriched in trace elements, such Ba, Cr, Sr, V, Zr, Zn and Ce (Table 5). The elevated trace elements contents are related to the presence of pyroxenes as shown by Panina and Stoppa (2009) who documented the enrichments of trace elements in clinopyroxenes in foidian olivine in southern Italy. Moreover, the pyroclasts display strong enrichments of light rare earth elements (LREE) over the heavy rare earth elements (HREE) (∑LREE/∑HREE = 12.38 to 13.71; La/Yb= 33.55 to 40.85, Table 5.5 and Fig.…”

Section: Geochemical Of Pyroclasts -mentioning

confidence: 76%

Mineralogical and geochemical signatures of Quaternary pyroclasts alterations at the volcanic Trindade Island, South Atlantic

Mateus

Varajão

Petit

et al. 2020

Journal of South American Earth Sciences

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This paper reports the composition and alteration products of pyroclasts in the Holocene Paredão volcano (pyroclast 1) and Late Quaternary Morro Vermelho Formation (pyroclasts 2 and 3) of Trindade Island, South Atlantic, Brazil using combined macromorphological, micromorphological, mineralogical and geochemical techniques.The pyroclasts 1 and 2 are interpreted as volcanic tuff breccia deposits, whereas pyroclast 3 is a lapilli deposit. They are dark gray in color with some altered reddish regions and show vesicles and amygdales structures with small greenish crystals of 2.0 mm scattered throughout the matrix. The eruptions can be regarded as Strombolian-type by producing pyroclastic deposits with coarse fragments with high vesicularity and fluidal shape that indicate magmatic degassing and fragmentation. Petrologic and XRD data revealed a mixture of biotite, goethite, ilmenite, anatase, magnetite, hematite, pyroxene, zeolites, and olivine as their main mineral components. Optical microscopy analysis confirms the vesicular and amygdaloid structures, with a hypocrystalline texture and a pale brown stained vitreous mass classified as sideromelane, due to its basaltic composition. The sideromelane changes to a reddish brown and yellowishbrown staining material identified as palagonite, clearly indicating a hydrovolcanic eruption that occurs when the ascending magma comes into contact with water. Infrared analyses in the palagonitized regions revealed the presence of halloysite, suggesting alteration of sideromelane to tubular clay minerals. Amygdales and microfractures are partially or totally filled with zeolites, which are formed by the percolation of water that reacts with the palagonite and precipitation of chemical elements of hydrothermal fluid.Reddish dark brown iddingsite and anhedral crystals of titaniferous magnetites occur in the fractures and edges of the olivine. These crystals are also dispersed in the matrix while some of them are zoned with Cr-rich core and Cr-poor edge, suggesting a deep mantle origin of the magma. The high trace elements content can be related to clinopyroxene (diopside) that include these elements. Geochemical data show that the pyroclasts are undersaturated in silica, plotting in the ultrabasic and foidites fields on the TAS classification diagram.

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Silicate-carbonate-salt liquid immiscibility and origin of the sodalite-haüyne rocks: study of melt inclusions in olivine foidite from Vulture volcano, S. Italy

Cited by 9 publications

References 32 publications

The origin of secondary heavy rare earth element enrichment in carbonatites: Constraints from the evolution of the Huanglongpu district, China

The origin of secondary heavy rare earth element enrichment in carbonatites: Constraints from the evolution of the Huanglongpu district, China

Liquid immiscibility between silicate, carbonate and sulfide melts in melt inclusions hosted in co-precipitated minerals from Kerimasi volcano (Tanzania): evolution of carbonated nephelinitic magma

Mineralogical and geochemical signatures of Quaternary pyroclasts alterations at the volcanic Trindade Island, South Atlantic

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