| 摘要:（摘要内容经过系统自动伪原创处理以避免复制，下载原文正常，内容请直接查看目录。） 绿辉石岩是一种较为罕有的岩石，这类岩石在硬玉岩区和超高压蜕变带偶有出露，惹起了相干学者的兴致与看重。在硬玉岩区中，今朝有报导的绿辉石岩重要在缅甸，被作为一种多期次硬玉化的标记。在研究俄罗斯西萨彦岭翡翠时，发明了绿辉石岩。该绿辉石岩重要由绿辉石、钠铬辉石构成，另外尚有大批铬铁矿、金云母和镍黄铁矿，个中绿辉石的含量可到达90%以上。绿辉石岩的构造有冠状构造、亚颗粒化和锯齿状高度缝合边等。该绿辉石岩中显示出冠状构造从开端发育到构成完整形状的演变趋向，在此进程中冠状构造焦点处的钠铬辉石被交卸为含Cr量较少的绿辉石。绿辉石岩的成份和构造特点反应了该岩石至多有两期的硬玉化感化：(1)主期的充填交卸感化，重要为硬玉质流体交卸铬尖晶石类构成钠铬辉石，交卸辉石类矿物构成绿辉石；(2)与蜕变变形同期的充填交卸感化，生成新的Ae一Di一Ko固溶系统列。而且两期的硬玉化感化主导了绿辉石岩中Cr的迁徙，表示为四种迁徙情势：(1)铬铁矿→钠铬辉石；(2)钠铬辉石→含铬较高的绿辉石；(3)含铬较高的绿辉石→含铬较低的绿辉石；(4)含铬较低的绿辉石进一步淡化。这四个阶段的“铬的淡化”和随同铬的淡化的结构剪切力的感化决议了翡翠的绿色的色形、色度和平均度，俄语论文题目，极年夜地作用着翡翠的质量。与缅甸绿辉石岩比较，西萨彦岭绿辉石岩中含有钠铬辉石，但缺乏硬玉，俄语论文题目，并存在与钠铬辉石有关的冠状构造；在化学成份上Mg、Ca的含量较高，Fe的含量低了许多，而且简直不含K。处理构成硬玉岩和招致绿辉石岩构成的硬玉质流体／熔体的物资起源的成绩是公道说明硬玉岩和绿辉石岩成因的主要步调。以往的研究成果显示：硬玉岩的物资起源与爬升洋壳上部富含Na的堆积物有关。据此推想硬玉岩是年夜洋板块在向下爬升至年夜陆板块的进程中，跟着温压的增年夜，其洋壳堆积物在必定前提下产生脱水或熔融，然后向上运移至超基性岩中结晶而成。绿辉石岩则能够与硬玉岩同时或以后构成，被以为是硬玉质的流体或熔体在爬升板块带高温高压的前提下，与蛇绿岩套内含Fe和Ca较高的岩石类型如辉石岩等交卸的产品。在硬玉质流体交卸含Ca高的辉石类矿物构成绿辉石的同时，硬玉质流体也交卸铬铁矿，构成钠铬辉石。 Abstract: Omphacitite is a relatively rare rocks. These rocks in jadeitite area and ultra high pressure metamorphic belt occasionally exposed, cause the coherent scholars interest and value. In the jadeitite area, reported the omphacitite in Burma today, as a multi period marker of jadeite. In the discussion of Russia's western Sayan jadeite jade, invented the omphacitite. The omphacitite important composed of diopside, kosmochlor, and there are still a large number of chromite, phlogopite and pentlandite. Medium green pyroxene content can be reached more than 90%. The structure of omphacitite coronary structure, subgrain and serrated suture edge height. The omphacitite shows coronal structure from the beginning of the development to constitute a complete shape the evolution of the trend, in this process in coronary structure at the focus of Ureyite is relinquish containing Cr less omphacite. Composition and structural features of the omphacitite reaction the rocks there are at least two jadeite of action: (1) the main stage filling relinquish his role important for jadeitic fluid relinquish chrome spinel composition of sodium chromium pyroxene, relinquish pyroxene mineral constitute omphacite; (2) and transformation of deformation over the same period of filling relinquish his role, generate new AE Di a Ko solid solution system. And two of the jadeite of probation dominated the omphacitite CR migration, said for four species of migratory situation: (1) the chromite, sodium chromium pyroxene; (2) sodium chromium pyroxene - high chromium containing omphacite; (3) on high chromium containing omphacite, chromium containing low omphacite; (4) low chromium containing omphacite further weakened. The four phase of the desalinization of chromium and with the structure of shear force of the influence of chromium dilution resolution color shape, green color of jadeite jade are peaceful, greatly affects the quality of jadeite. And Myanmar omphacitite, West Sayan omphacitite contains kosmochlor, but the lack of jadeite, and the presence of sodium chromium pyroxene about coronary structure; on the chemical composition of the higher content of Mg, CA, Fe content much lower and simply does not contain K. Constitute jadeitite and incur omphacitite constitute the jadeitic fluid / melt material origin of the results is reasonable description jadeitite and omphacitite causes an important step. The previous research results show that the material origin and climbing oceanic crust of jadeite rocks of the upper Na rich deposits on. According to suppose jadeitite is the eve of the oceanic plate down climb to the process of continental plate, along with the temperature and pressure enlargement, the oceanic crust deposits in certain conditions resulting from dehydration or melt, then to migrating to ultrabasic rocks crystallized into. Omphacitite can and jadeite rock at the same time or after a, is thought to be jadeitic fluids or melts in the subduction zone of high temperature and high pressure condition, and snake suite containing Fe and Ca higher rock types such as pyroxenite relinquish his products. In the jadeitic fluid relinquish containing high Ca pyroxene class composition of mineral, omphacite, jadeitic fluid relinquish chromite, sodium chromium pyroxene. 目录: |
