A NEW VIEWPOINT——MAGMA GENESIS OF JADEITE JADE
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摘要: 通过缅甸翡翠矿区的野外调查、各品种翡翠及流体包裹体的显微镜下观察、1 0 0多个点的电子探针分析,评述了已有的关于翡翠成因的假说,总结了世界上翡翠矿床的地质特征,论述了翡翠原生结构和后生结构及其与成因的关系,描述了包裹体的类型和特征,提出了翡翠成岩阶段的成因新认识——岩浆成因说,并分析了形成翡翠时的温度、压力条件。形成翡翠的岩浆为含水的、可能来源于地幔的硬玉质硅酸盐熔融体。结晶时的压力低限p>1.5GPa,温度变化范围在650~80 0℃之间。该成因说有别于过去的岩浆成因说。Abstract: Through the field survey of Myanmar jadeite jade, the microscope observation of a lot of jadeite jade thin sections and fluid inclusions and more than one hundred EPMA analysis, the hypothesis of jadeite jade genesis is reviewed, the geological characteristics of jadeite jade in the world is summarized, the types and characteristics of fluid inclusions are described, the relationship between jadeite jade texture and its genesis is discussed, a new viewpoint——magma genesis of jadeite jade——is put forward, and the p t condition under which jadeite jade crystallized is analyzed. The magma from which jadeite jade crystallized is hydrous jadeitic silica melt which may come from mantle. The crystal condition is p >1.5 GPa, t=650~800℃. This hypothesis of magma genesis put forward before.
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Keywords:
- jadeite jade /
- magma genesis /
- fluid inclusion /
- primary texture /
- secondary texture
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