陕西汉中南郑蛇纹石玉的矿物学研究  

A mineralogical study on the Serpentine in Nanzheng,Hanzhong,Shannxi

作　　者：刘养杰[1] 林晓明[1] 张婷[1] 刘溪[1] 曹晓斌[1] 康磊[1] 

机构地区：[1]西北大学大陆动力学国家重点实验室/地质学系,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2009年第6期1032-1036,共5页Journal of Northwest University（Natural Science Edition）

基　　金：陕西省科学基金资助项目(2003);西北大学地质学系国家人才培养创新基金资助项目(XDCX05-04);西北大学大陆动力学国家重点实验室基金资助项目(2008)

摘　　要：目的研究南郑蛇纹石玉的矿物学特征及其颜色成因。方法通过对南郑蛇纹石玉进行野外调研,并结合镜下观察、扫描电镜、X荧光光谱分析、X射线衍射、红外光谱等现代分析手段对南郑蛇纹石玉进行矿物学综合研究。结果南郑蛇纹石玉主要矿物成分为利蛇纹石,呈隐晶质、毛毡状交织结构。玉石中出现少量Fe,Ti,Mn离子替代Mg,占居八面体位置,A l替代部分Si,占居四面体位置,还有部分O被OH取代。结论南郑蛇纹石玉致色因素有多种,主要与过渡金属离子Fe3+的d-d跃迁以及Mn的含量有关。Aim To study the mineralogical characteristics and the color causes of Nanzheng Serpentine. Methods Morphological details were observed by microscope and SEM, X ray fluorescence spectrum analysis, X ray diffraction analysis of crystalline powder and infrared spectroscopic analysis were adopted in the comprehensive research. Results The mineral composition of Serpentine in Nanzheng is Lizardite, in which few Mg ions have been substituted by Fe, Ti, Mn in the octabedron place and in tetrahedron place few Al ions exchange Si, as well as OH which exchanges O. Conclusion With the above research, it has been indicated that there are several color causes for Serpentine in Nanzheng. The main reason is theFe^3＋ -Fe^2＋ interionic charge transfer, and Mn can also impact its color.

关 键 词：利蛇纹石 X荧光光谱分析 X射线衍射 红外光谱 类质同象替换 Fe3+的d-d跃迁 呈色机理 

分 类 号：P574.1[天文地球—矿物学]