Na-rich carbonate inclusions in perovskite and calzirtite from the Guli intrusive Ca-carbonatite, polar Siberia

Kogarko, L. N.; Plant, D. A.; Henderson, C. M. B.; Kjarsgaard, B A

doi:10.1007/bf00687205

Cited by 82 publications

(44 citation statements)

References 12 publications

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“…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. Although different evolutionary paths of the parental melt(s) of alkaline silicate and carbonatite rocks have been suggested (Le Bas 1977;Bailey 1993;Dawson et al 1996;Nielsen et al 1997;Lee and Wyllie 1997;Kjarsgaard 1998;Mitchell 2009;Guzmics et al 2011), several questions remain unanswered.…”

Section: Introductionmentioning

confidence: 95%

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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Section: Introductionmentioning

confidence: 95%

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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“…Study of the inclusions confirmed the significant role of immiscibility in natural alkaline systems. It was established (Andersen, 1988;Kogarko et al, 1991Kogarko et al, , 1995Mitchell, 1991Mitchell, , 1997Panina, 2005;Usol'tseva, 1999, 2000;Ripp et al, 2000;Sharygin, 2001;Solovova et al, 1996Solovova et al, , 1998Solovova et al, , 2005) that deep-seated magmas are initially enriched in volatiles, mainly CO 2 , alkalies, haloids, sulfur, and phosphorus. At first, these fluids probably serve as agents of mantle metasomatism and favor the generation of mantle melts.…”

Section: Discussionmentioning

confidence: 94%

Carbonatite melts and genesis of apatite mineralization in the Guli pluton (northern East Siberia)

Isakova

Panina

Rokosova

2015

Russian Geology and Geophysics

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Inclusions of mineral-forming environments in apatite-containing ijolites and magnetite-phlogopite-apatite ores in carbonatites were studied to elucidate the genesis of apatite mineralization in the Guli alkaline ultramafic carbonatite massif. Primary inclusions of carbonate-salt and carbonate melts have been discovered and studied. The carbonate-salt melt inclusions are of alkaline high-Ca composition and are enriched in P, Sr, SO 3 , and F (wt.%): CaO-30-40, Na 2 O-5-12, K 2 O-2-4, P 2 O 5 -1-3, SO 3 -1.5-3, and SrO-1-3. They also contain minor MgO, FeO, BaO, and SiO 2 (tenths and hundredths of percent). The homogenization temperature of these inclusions is 850-970 ºC. The carbonate inclusions contain predominant CaO (54-67 wt.%) and minor MgO, FeO, SrO, Na 2 O, and P 2 O 5 (tenths of percent). Their homogenization temperature is 840-860 ºC. Similar primary carbonate-salt and carbonate inclusions were found in garnet, and secondary ones were detected in silicate minerals (clinopyroxene and nepheline) of ijolites. Clinopyroxenes of ijolites also contain primary inclusions of alkaline ultramafic high-Ca melts similar in composition to melilitite-melanephelinites highly enriched in P, SO 3 , and CO 2 (wt.%): SiO 2 -41-46, Al 2 O 3 -8-16, FeO-2-8, MgO-3-6, CaO-12-20, Na 2 O-2-9, K 2 O-1-6, P 2 O 5 -0.4-2.1, SO 3 -0.2-2.3, and Cl-0.02-0.35. According to the obtained data, apatite of the magnetite-phlogopite-apatite ores and ijolites of the Guli pluton crystallized from phosphorus-rich alkaline carbonate-salt melts at 850-970 ºC. The generation of these melts was, most likely, due to the silicate-salt immiscibility in melilitite-melanephelinite melts highly enriched in salts, which occurred either at the final stages of clinopyroxene crystallization or during the formation of melilite. The presence of alkalies, S, F, and CO 2 in spatially separated carbonate-salt melts contributed to the concentration and preservation of phosphorus in them at low temperatures, which led to the formation of apatite mineralization in ijolites and ore deposit in carbonatites.

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“…Kogarko et al 30 suggested that the enrichment of alkalis in the Guli intrusive calciocarbonatite is a derivative from primary Mineral formulas represent those for end-member compositions. Occurrence distribution total of 13.3% is for shortite and nyerereite combined.…”

Section: Discussionmentioning

confidence: 99%

Evidence for the alkaline nature of parental carbonatite melts at Oka complex in Canada

2013

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The Earth's sole active carbonatite volcano, Oldoinyo Lengai (Tanzania), is presently erupting unique natrocarbonatite lavas that are characterized by Na-and K-bearing magmatic carbonates of nyerereite [Na 2 Ca(CO 3 ) 2 ] and gregoryite [(Na 2 ,K 2 ,Ca)CO 3 ]. Contrarily, the vast majority of older, plutonic carbonatite occurrences worldwide are dominated by Ca-(calcite) or Mg-(dolomite)-rich magmatic carbonates. Consequently, this leads to the conundrum as to the composition of primary, mantle-derived carbonatite liquids. Here we report a detailed chemical investigation of melt inclusions associated with intrusive (plutonic) calcite-rich carbonatites from the B120 Ma carbonatite complex of Oka (Canada). Melt inclusions are hosted by magnetite (Fe 3 O 4 ), which crystallizes through a significant period of carbonatite melt solidification. Our results indicate mineral assemblages within the melt inclusions that are consistent with those documented in natrocarbonatite lavas. We propose therefore that derivation of alkali-enriched parental carbonatite melts has been more prevalent than that preserved in the geological record.

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Na-rich carbonate inclusions in perovskite and calzirtite from the Guli intrusive Ca-carbonatite, polar Siberia

Cited by 82 publications

References 12 publications

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

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

Carbonatite melts and genesis of apatite mineralization in the Guli pluton (northern East Siberia)

Evidence for the alkaline nature of parental carbonatite melts at Oka complex in Canada

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