青海格尔木纳赤台软玉的玉石学特征及成因分析
发布时间：2018-08-01 13:05
【摘要】：软玉,中国玉文化的代表者,以其温润柔和的光泽和凝重的质感而受到人们的喜爱。随着新疆和田地区软玉资源的日渐短缺,市场上高品质软玉的价格被炒的越来越高,仿制品的种类与作假手段也越来越多。近年来,青海东昆仑地区新的软玉矿逐渐被发现,研究该处软玉的矿床学特征成为解决这一问题的关键。本文在此基础上对青海格尔木纳赤台软玉矿区的样品进行了研究。青海格尔木纳赤台软玉矿区位于东昆仑断裂带的构造背景中,围岩为上元古界万宝沟群碳酸盐岩组,矿区内出露的岩体有基性辉绿岩、花岗闪长岩、蛇纹岩、镁质碳酸盐、透闪石质大理岩等。通过野外进行实地采样后,我们对样品进行了挑选,选取不同岩体及岩体间交界过渡处的样品进行研究。研究过程主要包括手标本观察描述、相对密度测试、切磨薄片、对薄片进行显微镜下观察、折射率测试、电子探针测试、X射线粉晶衍射测试等。通过对测试数据进行整理分析,确定该地所产透闪石质大理岩的结构、构造以及玉化程度。其中透闪石化程度高的部分呈白色至淡青色,弱油脂光泽,折射率平均值为1.61,相对密度最高可达2.9215,可定名为软玉。电子探针结果显示玉化部分的岩石成分中主要有透闪石、方解石、滑石。薄片观察透闪石有显微隐晶、显微纤维等多种形态。围岩为镁质大理岩,侵入岩有加里东期花岗闪长岩、基性辉绿岩,并有后期多次岩浆热液侵入。围岩、侵入岩、后期热液之间发生活跃的离子交换形成了透闪石,并伴随着强烈的构造运动。基性辉绿岩蚀变程度较高,出露部分的辉石基本完全蚀变为绿泥石、方解石、阳起石。花岗闪长岩、镁质碳酸盐、基性辉绿岩、后期热液对软玉的形成缺一不可。
[Abstract]:Nephrite, the representative of Chinese jade culture, is loved by people for its gentle luster and dignified texture. With the increasingly shortage of nephrite resources in Hotan area of Xinjiang, the price of high-quality nephrite is being speculation higher and higher, and the kinds and means of counterfeiting are more and more. In recent years, new nephrite deposits in East Kunlun area of Qinghai Province have been gradually discovered, and the key to solve this problem is to study the ore deposit characteristics of the nephrite deposits there. On this basis, the samples of Nachitai nephrite mining area in Golmud, Qinghai Province are studied. In the tectonic setting of the East Kunlun fault zone, the Naqitai nephrite ore area in Golmud, Qinghai Province is located in the carbonate rock formation of the Upper Proterozoic Wanbaogou Group. The exposed rock bodies in the mining area include basic diabase, granodiorite, ophiolite, magnesia carbonate, etc. Tremolite marble, etc. After sampling in the field, we selected samples from different rock masses and their intersections. The research process mainly includes hand specimen observation description, relative density measurement, cutting and grinding thin slice, microscope observation, refractive index test, electron probe test, X-ray powder diffraction test, etc. Based on the analysis of test data, the structure, structure and jade degree of tremolite marble produced in this area are determined. The part with high tremolization degree is white to light blue, weak oil luster, average index of refraction is 1.61, the highest relative density can reach 2.9215, can be named as nephrite. The electron probe results show that there are mainly tremolites, calcite and talc. The tremolites were observed to have microcrystalline, microscopic fibers and many other forms. The surrounding rock is magnesia marble. The intrusive rocks include Caledonian granodiorite, basic diabase and late magmatic hydrothermal intrusion. The active ion exchange between the surrounding rock, intrusive rock and hydrothermal solution forms tremolite, which is accompanied by strong tectonic movement. The basic diabase is highly altered, and the exposed pyroxene is completely altered into chlorite, calcite and actinolite. Granodiorite, magnesite carbonate, basic diabase, late hydrothermal formation of nephrite is indispensable.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P619.28
本文编号：2157671
[Abstract]:Nephrite, the representative of Chinese jade culture, is loved by people for its gentle luster and dignified texture. With the increasingly shortage of nephrite resources in Hotan area of Xinjiang, the price of high-quality nephrite is being speculation higher and higher, and the kinds and means of counterfeiting are more and more. In recent years, new nephrite deposits in East Kunlun area of Qinghai Province have been gradually discovered, and the key to solve this problem is to study the ore deposit characteristics of the nephrite deposits there. On this basis, the samples of Nachitai nephrite mining area in Golmud, Qinghai Province are studied. In the tectonic setting of the East Kunlun fault zone, the Naqitai nephrite ore area in Golmud, Qinghai Province is located in the carbonate rock formation of the Upper Proterozoic Wanbaogou Group. The exposed rock bodies in the mining area include basic diabase, granodiorite, ophiolite, magnesia carbonate, etc. Tremolite marble, etc. After sampling in the field, we selected samples from different rock masses and their intersections. The research process mainly includes hand specimen observation description, relative density measurement, cutting and grinding thin slice, microscope observation, refractive index test, electron probe test, X-ray powder diffraction test, etc. Based on the analysis of test data, the structure, structure and jade degree of tremolite marble produced in this area are determined. The part with high tremolization degree is white to light blue, weak oil luster, average index of refraction is 1.61, the highest relative density can reach 2.9215, can be named as nephrite. The electron probe results show that there are mainly tremolites, calcite and talc. The tremolites were observed to have microcrystalline, microscopic fibers and many other forms. The surrounding rock is magnesia marble. The intrusive rocks include Caledonian granodiorite, basic diabase and late magmatic hydrothermal intrusion. The active ion exchange between the surrounding rock, intrusive rock and hydrothermal solution forms tremolite, which is accompanied by strong tectonic movement. The basic diabase is highly altered, and the exposed pyroxene is completely altered into chlorite, calcite and actinolite. Granodiorite, magnesite carbonate, basic diabase, late hydrothermal formation of nephrite is indispensable.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P619.28
【参考文献】
相关期刊论文 前2条
1 刘飞;余晓艳;;中国软玉矿床类型及其矿物学特征[J];矿产与地质;2009年04期
2 孔祥福;赵想安;燕永洁;;格尔木三岔玉石矿地质特征及成因分析[J];中国非金属矿工业导刊;2010年04期
，本文编号：2157671
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