The formation of curve shape quartz-muscovite layers in Koktokay pegmatite intrusions, Altay, and its implications
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摘要: 石英白云母层时常紧贴伟晶岩侵入体的边界出现且平行边界延伸。但是在新疆阿尔泰可可托海伟晶岩型稀有金属矿区伟晶岩体中石英白云母层出现了三种不同类型的弧形起伏,这些弧形形态仅用矿物的定向生长是难以解释的。弧形石英白云母层具有统一的"背地性"指向(弧形凸起顶端一律朝上)并且越靠近伟晶岩侵入体的顶部弧形凸起越明显,在侵入体侧部边界的石英白云母层不存在弧形凸起形态。这些形态特点与浮力作用下形成的形态具有可比性,暗示浮力与弧形石英白云母层间存在密切的成因联系。石英白云母层与石英钠长石层的间隔出现指示伟晶岩浆中挥发分含量的周期性增加。挥发分含量的周期性增加导致了挥发分不断加入未固结的剩余岩浆中并向伟晶岩体顶部上升,逐步在伟晶岩侵入体的顶部形成了弧形石英白云母层。弧形石英白云母层的大量出现不仅说明伟晶岩侵入体规模较大,也暗示存在有利的挥发分保存环境,对伟晶岩型稀有金属矿产的形成和稀有金属找矿预测起到非常重要的作用。Abstract: Quartz-muscovite layers are located near the edges of pegmatite intrusions and these layers are usually parallel to the contact margins. However, curve quartz-muscovite layers are found in the Koktokay ore deposit, Altay, Xinjiang. The mechanism of the curve shape is unknown. The curve quartz-muscovite layers have uniform shape and they are usually concentrated near the shallow dipping hanging walls of the Koktokay pegmatite intrusions. The quartz-muscovite layers near the side walls have no such curve shape. Such features are compatible to the textures formed by fluid buoyancy. According to the textures and previous studies of fluid inclusions, the alternation between the quartz-albite layers and quartz-muscovite layers is due to the changing volume of volatile in magma. The changing volume of volatile in magma not only caused the formation of volatile rich magma, but also caused the floating of the magma. The surface tension then keeps the rising magma as a curve margin. The existence of a large amount of curve quartz-muscovite means a large scale pegmatite intrusion and a benefit structural environment for volatile preservation. Such information is important for the prospecting of rare metals.
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Key words:
- Koktokay /
- Curve shape /
- Quartz-muscovite layers /
- Volatile
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