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首页> 外文期刊>Contributions to Mineralogy and Petrology >Multiphase carbonate-salt immiscibility in carbonatite melts: data on melt inclusions from the Krestovskiy massif minerals (Polar Siberia)
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Multiphase carbonate-salt immiscibility in carbonatite melts: data on melt inclusions from the Krestovskiy massif minerals (Polar Siberia)

机译：碳酸盐熔岩中多相碳酸盐与盐的不溶混性：来自Krestovskiy块状矿物（极性西伯利亚）的熔体包裹体数据

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摘要

Minerals of olivine-melilite and olivine-monticellite rocks from the Krestovskiy massif contain primary silicate-salt, carbonate-salt, and salt melt inclusions. Silicate-salt inclusions are present in perovskite I and melilite. Thermometric experiments conducted on these inclusions at 1,230-1,250 deg 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 deg 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 deg C). They contain alkalies, Ca, P, SO_3, Cl, and CO_2. According to the ratio of these components and predominance of one of them, melt inclusions are divided into 6 types: I-hyperalkaline (CaO/(Na_2O + K_2O) < 1) carbonate melts; II-moderately alkaline (CaO/(Na_2O + K_2O) > 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 840-800deg C. A conclusion in made that the origin of carbonate melts during the formation of intrusion rocks is related to silicate-carbonate immiscibility 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 fractions. Liquid carbonate-salt immiscibility took place in a wide temperature range from 1,200-1,190 deg C to 800 deg 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.
机译：来自Krestovskiy地块的橄榄石-沸石和橄榄石-蒙脱石岩石的矿物包含初级硅酸盐，盐，碳酸盐和盐熔体。钙钛矿I和陨石中存在硅酸盐包裹体。在1,230-1,250℃下对这些夹杂物进行的测温实验表明，硅酸盐与碳酸盐液体不可混溶。复合碳酸盐-盐熔体的小球，富含碱，P，S和Cl，在硅酸盐熔体中分离。钙钛矿II中某些夹杂物中的碳酸盐小球在1,190-1,200摄氏度下分离成组成更简单的不混溶液相。碳酸盐和盐夹杂物存在于蒙脱石，陨石和石榴石中，并在接近温度（980-780摄氏度）的条件下均质化。它们包含碱金属，Ca，P，SO_3，Cl和CO_2。根据这些组分的比例和其中一种的优势，将熔体夹杂物分为6种类型：I-碱性（CaO /（Na_2O + K_2O）<1）碳酸盐熔体; II-中度碱性（CaO /（Na_2O + K_2O）> 1）碳酸盐融化; III-硫酸盐-碱性熔体; IV-磷酸盐-碱性熔体; V-碱-氯熔融，VI-钙-碳酸盐熔融。建立了以上所有类型的共同发生及其同生特征。一些夹杂物在840-800摄氏度时显示出碳酸盐与盐的不溶混现象。得出的结论是，侵入岩形成过程中碳酸盐融解的成因与母碱-超碱性岩浆中的硅酸盐与碳酸盐的不溶化有关。分离出的碳酸盐熔体具有复杂的碱性组成。在不稳定的条件下，熔体开始分解成更简单的不混溶部分。不同类型的碳酸盐，盐和盐包裹体似乎反映了这些在空间上分离的不混溶馏分的组成。液态碳酸盐与盐的不混溶发生在1,200-1,190摄氏度至800摄氏度的较宽温度范围内。在宏观条件下发生此类过程很可能会导致出现不同类型的不混溶碳酸盐与盐的出现熔化并导致形成不同类型的碳酸盐：碱金属磷酸盐，碱金属硫酸盐，碱金属氯化物，以及最普遍的钙质碳酸盐。

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