Crystal Forms of Experimental Minerals from Volcanic Rocks and Dynamic Mechanism for Their Growth
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    Abstract:

    Melting, crystallization and quenching experiments were made on certain typical basalts (including alkaline picriticbasalt, olivine tholeiite and high-alumina basalt) aswell as some andesites from Fujian, Jiangxi andHenan of China and columbretitic tephrite from Vesuvian volcano of Italy. Three forms of minerals, namely microcrystals, skeletal crystals and embryonic crystals were formed. The microcrystal minerals included tabular-prismatic plagioclase, hourglass clinopyroxene, granular-prismatic leucite and magnetite; the skeletalcrystals included hollow tabular-prismatic plagioclase,”工-shaped”olivine, herringbone enstenite and zonal magnetite; the microcrystals included spherulitic plagioclase, petal-like-spherulitic clinopyroxene,snowflake-branched magnetite. This paper has summarized morphological characteristics and compositional features of experimental crystallized minerals, calculated growth rates of minerals, analysed formation mechanism of skeletal crystal and embryonic crystal minerals, probed into mechanisms fororientated arrangement of skeletal crystal minerals plagioclase and olivine as well as growth of skeletal crystal dendrite of enstenite, dealt with the growing process of crystal whisker, described the relationship of the embryonic crystal form to grain of crystallization as well as that of the crystal form to crystallization temperature, growth rate, and viscosity and acidity of magmatic melt.

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白志民,周珣若,1997,火山岩实验矿物的结晶形态及其生长动力学机制[J].岩石矿物学杂志,16(1):56~62. Bai Zhimin, Zhou Xunruo,1997,Crystal Forms of Experimental Minerals from Volcanic Rocks and Dynamic Mechanism for Their Growth[J]. Acta Petrologica et Mineralogica,16(1):56~62.

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