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首页> 外文期刊>Journal of Asian earth sciences >Crystallization processes of quartz in a granitic magma: Cathodoluminescence zonation pattern controlled by temperature and titanium diffusivity
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Crystallization processes of quartz in a granitic magma: Cathodoluminescence zonation pattern controlled by temperature and titanium diffusivity

机译：花岗岩岩浆中石英的结晶过程：受温度和钛扩散率控制的阴极发光区划模式

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摘要

Quartz from a granitic pluton is found to have formed through sequential growth events under different mechanisms and crystallization temperatures, which can provide new insights into magmatic processes of granitic magmas that were eventually consolidified into plutons. The events were identified using (1) the description of crystal shape and occurrence, (2) the study of the internal structure with cathodoluminescence (CL), and (3) derivation of the crystallization temperatures based on TitaniQ thermometry. The magmatic quartz crystals from the Toki granite, central Japan, are characterized as having the following internal structures: oscillatory zonation, no-oscillatory zonation with luminescence gradation (gradational zonation), and heterogeneous CL. The quartz crystals with oscillatory zonation were formed in the temperature range of about 800 degrees C to below 700 degrees C, which is referred to as oscillatory zoning temperature (OZT) conditions. The CL zonation pattern was controlled by the temperature conditions and titanium diffusivity in the melt (magma). The crystallization process of quartz within the Toki granite reveals the cooling processes of the granitic pluton; the lithofacies with a high frequency of oscillatory-zoned quartz underwent slower cooling under the OZT conditions than those in other lithofacies.
机译：发现来自花岗岩岩体的石英是通过在不同机制和结晶温度下的连续生长事件形成的，这可以为花岗岩岩浆的岩浆作用过程提供新的见解，而岩浆岩浆最终被整合成岩浆。使用（1）晶体形状和发生的描述，（2）阴极发光（CL）的内部结构的研究以及（3）基于TitaniQ测温法的结晶温度推导确定事件。来自日本中部Toki花岗岩的岩浆石英晶体具有以下内部结构：振荡带状，具有发光渐变的无振荡带（渐变带）和异质CL。在约800摄氏度至低于700摄氏度的温度范围内形成具有振荡分区的石英晶体，这被称为振荡分区温度（OZT）条件。通过温度条件和熔体（岩浆）中钛的扩散率来控制CL分区模式。 Toki花岗岩中石英的结晶过程揭示了花岗岩岩体的冷却过程。在OZT条件下，具有高振荡带石英频率的岩相的冷却速度要比其他岩相的冷却慢。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第may1期|104289.1-104289.16|共16页
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  • 作者单位

    Yamagata Univ Fac Sci 1-4-12 Kojirakawa Yamagata 9908560 Japan;

    Yamagata Univ Fac Sci 1-4-12 Kojirakawa Yamagata 9908560 Japan|Japan Atom Energy Agcy Tono Geosci Ctr Izumi Ku 959-31 Jorinji Toki Gifu 5095102 Japan;

    Nagoya Univ Inst Space Earth Environm Res Chikusa Ku Nagoya Aichi 4648602 Japan;

    Japan Atom Energy Agcy Mizunami Underground Res Lab 1-64 Yamanouchi Gifu 5096132 Japan;

    Kumamoto Univ Grad Sch Sci & Technol Chuo Ku 2-39-1 Kurokami Kumamoto 8608555 Japan;

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  • 正文语种 eng
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  • 关键词

    Quartz; Cathodoluminescence characterization; Oscillatory zonation; TitaniQ thermometer; Diffusion-controlled growth; Toki granitic pluton;

    机译：石英;阴极发光特性;振荡分区;TitaniQ温度计;扩散控制的生长;土岐花岗岩体;

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