乌克兰盾构岩体室晶岩中黄玉晶面简单形态变异的遗传意义

IF 0.5 Q4 MINERALOGY Mineralogical Journal-Ukraine Pub Date : 2022-01-01 DOI:10.15407/mineraljournal.44.03.040
O. Vovk, I. Naumko, V. Pavlyshyn
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引用次数: 0

摘要

对位于乌克兰地盾西北部的Korosten岩体室晶岩的不同矿物构造带的黄玉晶体形态和习性畸变进行了研究。假定晶体的对称性遵循居里原理。这意味着只有晶体和形成晶体的介质共有的对称元素才会保留在真正的多面体上。将包含无穷阶轴的对称类型简化为以下几类:1)∞L∞∞PC是一个球;2)∞L∞是一个充满光活性液体的球;3) L∞∞L2∞PПC为圆柱体;4) L∞ПС为旋转气缸;5) L∞∞P为锥;6) L∞∞L2为扭圆柱;7) L∞是一个旋转锥。含黄玉共生石的成矿介质的真实流体动力学情况的对称性往往演变为:∞L∞∞PC→L∞∞P→P。在这种情况下,形成的黄玉晶体具有P对称性,如果其对称面与流动对称面重合,则其晶体具有P对称性,否则根本没有对称元素。特别是,对于第一个晶体,上面的表面生长得更快,并且它们的尺寸比下面的小。生长受到生长晶面所需液体供应的限制。因此,可以得出流体的流动方向是自上而下的。如果流体流动的对称面和多面体的对称面不重合,则在视觉上形成第二种类型的三斜晶体。它们比第一种要丰富得多。除了这两种类型之外,还发现了具有外部对称L2的多面体。很难想象一个如此对称的环境,因为;在两个方向相反的流体流之间不太可能生长附着的晶体。然而,沿M{110}面变平的多面体和沿l{120}面变平的多面体是常见的。也就是说,它们生长的环境中,流体流动的方向与{110}面平行(较少情况下是{120}),从简单形状的小面流向大面。流体的流动方向很难确定,黄玉晶体的简单形态的面或多或少具有相同的发展。
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GENETIC SIGNIFICANCE OF VARIATIONS IN THE FACES OF THE SIMPLE FORMS OF TOPAZ CRYSTAL FROM CHAMBER PEGMATITES OF THE KOROSTEN PLUTON (UKRAINIAN SHIELD)
Topaz crystal morphology and habit distortion has been studied in various mineral-structural zones of chamber pegmatites of the Korosten pluton, which is located in north-western part of the Ukrainian Shield. It was assumed that the symmetry of the crystals obey the Curie principle. This means that only the symmetry elements common to the crystal and the medium in which it is formed will remain on real polyhedrons. The types of symmetry that contain the axes of infinite order are reduced to the following groups: 1) ∞L∞∞PC is a ball; 2) ∞L∞ is a ball filled with an optically active liquid; 3) L∞∞L2∞PПC is a cylinder; 4) L∞ПС is a rotating cylinder; 5) L∞∞P is a cone; 6) L∞∞L2 is a twisted cylinder; 7) L∞ is a rotating cone. Symmetry of the real fluid-dynamic situation of the mineral-forming medium of topaz-bearing parageneses often evolves in the following way: ∞L∞∞PC → L∞∞P → P. In this case, the flow of the mineral-forming fluid has the symmetry P. The resulting topaz crystals can have P symmetry if their symmetry plane coincides with the flow symmetry plane, otherwise they have no symmetry elements at all. In particular, it is shown for the first crystals that the upper faces grew faster, and their size is smaller than that of the lower ones. Growth was limited by the supply of the necessary fluid to the growing crystal faces. Hence, it follows that the fluid flow was in the direction from top to bottom. If the planes of symmetry of the fluid flow and of the polyhedron do not coincide, then visually triclinic crystals of the second type are formed. They are much more abundant than the ones of the first type. In addition to these two types, polyhedra with external symmetry L2 are found. It is difficult to imagine an environment with such symmetry because; it is unlikely that an attached crystal would grow between two fluid streams moving in opposite directions. Nevertheless, polyhedra flattened along the faces M {110} and less often along l {120} are frequent. That is, they grew in the environment in which the fluid flow moved in a direction parallel to the {110} faces (and less often {120}), in the direction from the smaller faces of a simple forms to the larger ones. The direction of fluid flow is more difficult to establish, with more or less the same development of the faces of the simple form of the topaz crystal.
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