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陈菲,苏文,张铭,李晓光,胡鑫蒙. 2019. 褐帘石的谱学特征. 岩石学报, 35(1): 233-242
褐帘石的谱学特征
作者单位E-mail
陈菲 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029
中国科学院大学, 北京 100049 
 
苏文 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029 suwen@mail.iggcas.ac.cn 
张铭 中国工程物理研究院材料研究所, 江油 621908  
李晓光 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029  
胡鑫蒙 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029
中国科学院大学, 北京 100049 
 
基金项目:本文受国家自然科学基金项目(41672061、41472059)资助.
摘要:
      本文研究了6个来自不同产状、不同地区的含褐帘石样品,包括4个伟晶岩(M1663来自内蒙集宁益元兴、M7673来自内蒙集宁察汗营地区、M4960来自美国Amherst County Virginia地区、M4976来自挪威Liksviken地区)、2个矽卡岩(M1697产自河北地区、M1679产自湖南郴县地区)。通过对这6个不同产状褐帘石的电子探针主量、稀土和微量元素分析及拉曼、红外光谱学的研究来揭示褐帘石晶体化学特征。结果表明,褐帘石成分均匀,晶体内发育微裂隙,局部有脉体充填,但不同产状的褐帘石样品在主量元素如FeO、CaO、Al2O3以及REE如Ce2O3、Nd2O3、La2O3的含量具有明显的差别。其系统的光谱学数据表明褐帘石晶体的特征峰强度和峰位的偏移均与其组分有关,并分析指派了部分光谱峰位的归属,揭示了褐帘石中特殊谱峰位置的迁移与其元素含量、晶体结构之间的关系。拉曼光谱揭示了褐帘石单晶有20组拉曼活性谱峰(ν1~ν20),其中ν2~ν4、ν5~ν8、ν16~ν19谱峰的迁移与A位上的Ca与稀土元素之间置换作用有关;ν10~ν12谱峰是O-Si-O弯曲振动引起,其拉曼谱峰的偏移可能与Si含量有关;ν13~ν14谱峰的迁移则可能是多种元素变化共同作用的结果。褐帘石单晶红外光谱展示了13组红外活性谱峰(a-m),h-k谱峰的偏移与在M1或M3位上Fe3+和Al相互替代而导致的;b-g谱峰的偏移是与硅氧四面体中Si-O非对称伸缩振动有关;OH(l-m)双峰的出现可能与M1、M3位上Fe3+的含量有关。研究结果表明伟晶岩类岩石中褐帘石晶体结构中Fe3+与Al3+间的置换作用强于矽卡岩类岩石中的褐帘石;而矽卡岩类岩石中褐帘石晶体结构中在A位上稀土元素与Ca置换作用则大于伟晶岩类岩石中的褐帘石。
英文摘要:
      Six allanite-bearing samples from different occurrences and locations including four pegmatites and two skarns are studied. The pegmatites are from the Yiyuanxing (M1663) and the Chahanying (M7673) in the Tsining of Inner Mongolia, the Amherst County Virginia of America (M4960), the Liksviken of Norway (M4976). The skarns are from Hebei Province (M1697) and the Chen County of Hunan Province (M1679). The chemical features of six allanite samples are revealed by analysis of the major and trace elements of Electron Probe Microanalysis (EPMA), Raman, Infrared spectroscopy. The results show that compositions of allanite grains are homogeneous. The allanite grains have cracks with vein filled. However, the contents of major element including FeO, CaO and Al2O3 and Rare Earth Element (REE) such as Ce2O3, Nd2O3 and La2O3 are different in the allanites. The systematic spectroscopic data of the allanites show that the characteristic peak intensity and their shift are related to their components, and assigning, discussing the relationship between special peak shift of allanite, the component of element and its crystal structure. The systematic research of Raman, Infrared spectroscopy and its constituent not only can reveal characteristics of the crystal structure, but also can discuss the difference between its structure and forming environment. Raman spectroscopy reveals that there are 20 Raman peaks of the allanites (ν1~ν20). The peaks shift of ν2~ν4, ν5~ν8 and ν16~ν19 are related to the substitution between Ca and REE. The ν10~ν12 are attributed to the O-Si-O bending vibration modes and their peak shift are related to Si content. The shifts of ν13~ν14 maybe result of the combined action of multi-element changes. Infrared spectroscopy shows 13 infrared peaks (a-m) of the allanites. The peak shifts of h-k are described as substitution between Fe3+ and Al on the M1 or M3. The shifts of b-g are attributed to Si-O asymmetric stretching modes on the Si-O tetrahedron. The occurrence of OH double peaks of stretching (l-m) may be related to the content of Fe3+ at the M1 and M3. Our results show that substitution between Fe3+ and Al3+ of the allanite of the pegmatites is more than the allanite of the skarns. However, substitution between REE and Ca on the A of the allanite of the pegmatites is less than those of the skarns.
关键词:褐帘石  晶体结构  拉曼光谱  红外光谱
投稿时间:2018-08-07  修订日期:2018-11-18
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