| 广西大化玉的宝玉石学特征和矿床成因 |
| |
| 引用本文： | 徐立国,王时麒.广西大化玉的宝玉石学特征和矿床成因[J].岩石矿物学杂志,2016,35(S1):1-11. |
| |
| 作者姓名： | 徐立国 王时麒 |
| |
| 作者单位： | 中国地质博物馆, 北京 100034,北京大学 地球与空间科学学院, 北京 100871 |
| |
| 摘 要： | 通过偏光显微镜、电子显微镜、电子探针仪、X射线衍射仪、红外光谱仪以及拉曼光谱仪等测试对广西大化玉的宝玉石学特征进行了研究，结果表明大化玉主要由微晶透闪石集合体组成，并含有方解石、透辉石、磷灰石、石英、绿泥石、蛇纹石、滑石、石榴石和褐铁矿等次要矿物。对其硬度、密度、折射率、抗压强度、抗拉强度和韧性等进行了系统测定。通过野外考察以及对室内成矿温度、氢氧同位素、硅同位素和稀土元素等特征进行综合分析，确定大化玉矿床成因类型为层控性接触交代型岩浆热液矿床，根据辉绿岩中锆石U-Pb法测年，确定其成矿年龄为2.6亿年左右，并建立了对应成矿模式图。
|
| 关 键 词： | 大化玉 结构 成分 宝玉石学特征 矿床成因 |
| 收稿时间： | 2016/11/4 0:00:00 |
| 修稿时间： | 2016/11/11 0:00:00 |
Gemological characteristics and genesis of Dahua nephrite |
| |
| XU Li-guo and WANG Shi-qi.Gemological characteristics and genesis of Dahua nephrite[J].Acta Petrologica Et Mineralogica,2016,35(S1):1-11. |
| |
| Authors: | XU Li-guo and WANG Shi-qi |
| |
| Institution: | Geological Museum of China, Beijing 100034, China and School of Earth and Space Sciences, Peking University, Beijing 100871, China |
| |
| Abstract: | The main mineral composition of Dahua nephrite is microcrystalline tremolite, and other minor minerals include calcite, diopside, apatite, quartz, chlorite, serpentine, talc, garnet and limonite. This study employed such means as orthogonal polarization microscope, electron microprobe analysis, X-ray powder diffraction and infrared spectrometer. The hardness, density, refractive index, compressive strength, tensile strength and toughness of the Dahua nephrite were determined. It is shown that the genetic type of the deposit belongs to stratabound and contact metasomatic type magmatic hydrothermal deposit, as shown by REE, hydrogen, oxygen and silicon isotope analysis. The mineralization age is 260 million years, as revealed by U-Pb zircon dating of diabase. |
| |
| Keywords: | Dahua nephrite structure composition characteristics of gems genesis of ore deposit |
|
| 点击此处可从《岩石矿物学杂志》浏览原始摘要信息 |
| 点击此处可从《岩石矿物学杂志》下载免费的PDF全文 |
|
