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- W1595676559 abstract "Minerals of olivine-melilite and olivine-mon- ticellite rocks from the Krestovskiy massif contain pri- mary silicate-salt, carbonate-salt, and salt melt inclusions. Silicate-salt inclusions are present in perov- skite I and melilite. Thermometric experiments con- ducted on these inclusions at 1,230-1,250� C showed silicate-carbonate liquid immiscibility. Globules of composite carbonate-salt melt rich in alkalies, P, S, and Cl separated in silicate melt. Carbonate salt globules in some inclusions from perovskite II at 1,190-1,200� C separated into immiscible liquid phases of simpler composition. Carbonate-salt and salt inclusions occur in monticellite, melilite, and garnet and homogenize at close temperatures (980-780� C). They contain alkalies, Ca, P, SO3, Cl, and CO2. According to the ratio of these components and predominance of one of them, melt inclusions are divided into 6 types: I—hyperalkaline (CaO/(Na2O+K2O) £ 1) carbonate melts; II—moder- ately alkaline (CaO/(Na2O+K2O)>1) carbonate melts; III—sulfate-alkaline melts; IV—phosphate-alkaline melts; V—alkali-chloridic melts, and VI—calc-carbon- ate melts. Joint occurrence of all the above types and their syngenetic character were established. Some inclusions demonstrated carbonate-salt immiscibility phenomena at 840-800� C. A conclusion in made that the origin of carbonate melts during the formation of intrusion rocks is related to silicate-carbonate immisci- bility in parental alkali-ultrabasic magma. The separated carbonate melt had a complex alkaline composition. Under unstable conditions the melt began to decompose into simpler immiscible fractions. Different types of carbonate-salt and salt inclusions seem to reflect the composition of these spatially isolated immiscible frac- tions. Liquid carbonate-salt immiscibility took place in a wide temperature range from 1,200-1,190� C to 800� C. The occurrence of this kind of processes under macro- conditions might, most likely, cause the appearance of different types of immiscible carbonate-salt melts and lead to the formation of different types of carbonatites: alkali-phosphatic, alkali-sulfatic, alkali-chloridic, and, most widespread, calcitic ones." @default.
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- W1595676559 date "2005-01-01" @default.
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- W1595676559 title "Multiphase carbonate-salt immiscibility in carbonatite melts: data on melt inclusions from the Krestovskiy massif minerals" @default.
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