龙溪软玉的矿物学研究

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	龙溪软玉的矿物学研究
	王春云
	1988
学位授予单位	中国科学院地球化学研究所
学位授予地点	中国科学院地球化学研究所
学位名称	博士
摘要	龙溪玉是除新疆软玉、台湾软玉之外的中国三大软玉之一。本文采取以宏观到微观再到亚微观逐步深入的工作方法，在地质产状、物质成分、物理性质、谱学特征、显微——亚显微组构等方面对龙溪玉进行了基础矿物学。矿物物理学和成因矿物学或岩石学的综合性研究。最后，提出了龙溪玉形成的过程机理和成因模式。龙溪玉是多相变质作用过程中热力场和应力场交相变化的动热变质作用的产物，反映了早期的变质结晶作用，构造期的变形作用及其后的恢复，重结晶作用和退变质作用的复杂结合。文中并对Cao－Mgo－Sio_2－H_2o－Co_2五元五相热力学多体系通过构筑拓扑相图的方法深入探讨含玉体透闪片岩在区域进变质作用过程中形成的温压条件，估讨为550－600℃。4－5干巴，而变形作用与退变质作用过程中的温温压条件则明显低于这个数值范围。
其他摘要	Longxi Nephrite is one of the three famous kinds of nephrites in China besides Xinjiang Nephrite and Taiwan Nephrite. This article conduct a comprehensive study of fundamental mineralogy, mineral physics and origin of minerals or rocks of Longxi Nephrite in geological occurrences, composition, physical properties, spectroscopic characteristics, micro- to sub-microscopic fabrics by working method of deepgoing step by step from macroscopically to microscopically to sub-micro-scopically. Finally, process mechanism and origin model for the formation of Longxi Jade are proposed. Longxi Nephrite is a product of dynamothermal metamorphism in which thermogravimetric field and stress field are changing alternatively during polyphase metamorphism, reflecting complex combination of early metamorphic crystallization, tectonic deformation and subsequent recovery, recrystallization and retrograde metamorphism. This article also deals with T-P conditions for the formation of "jade-bearing mass" tremolite schist during regional progressive metamorphism by constructing topological phase diagrams of CaO-MgO-SiO-H_2O-CO_2 5-unit 5-phase (tremolite + talc + dolomite + quartz + calcite) thermodynamic multi-system, which is estimated to be within 550 - 600 ℃, 4 - 5 kbars, apparently greater than T-P conditions for deformation and retrograde metamorphism.
页数	106
语种	中文
文献类型	学位论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/3760
专题	研究生_研究生_学位论文
推荐引用方式 GB/T 7714	王春云. 龙溪软玉的矿物学研究[D]. 中国科学院地球化学研究所. 中国科学院地球化学研究所,1988.