Multinuclear NMR study of Cs-bearing geyserites of the Targejia hot spring cesium deposit in Tibet

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	Multinuclear NMR study of Cs-bearing geyserites of the Targejia hot spring cesium deposit in Tibet
	Zhou, Bing 1,2; Ren, Erfeng 2; Sherriff, Barbara L.3; Yao, Yefeng 4,5
	2013-05-01
发表期刊	AMERICAN MINERALOGIST
卷号	98 期号:5-6 页码:907-913
关键词	Cs-bearing Geyserite Deposits Tibet Si-29 Cs-133 H-1 Mas Nmr Ir Silanol Groups Mineralization
摘要	The large scale Targejia hot spring type Cs deposit in Tibet is unique and still active today with the distribution of hot springs being controlled by tectonic movements of the Tibetan Plateau. The ore bodies of the Targejia Cs deposit are mainly composed of geyserite, a Cs-containing opal. In this study, a combination of X-ray diffraction, infrared spectroscopy, and Si-29, Cs-133 magic angle spinning nuclear magnetic resonance (MAS NMR) were used to study the location and mobilization of Cs in geyserites. Si-29 NMR spectra indicate that the relative amounts of Q(2), Q(3), and Q(4) species vary in geyserite samples of different mineralization stages. Based on the Cs-133 chemical shift as well as the change in "Si chemical shift ranges (especially for Q2), cesium is inferred to associate with Q(3) and Q(2) silanol groups, where it is coordinated by O2-, OH-, and H2O as a network modifying cation. As Cs-bearing geyserite ages and dehydrates, Q(2) and Q(3) polymerize giving an increase in Q(4). This is accompanied with a decrease in Cs content indicating that Cs may be leached out from the opals as it loses its original coordination environment in the silicate framework.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/4476
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Tongji Univ, Coll Mat Sci & Engn, Shanghai 201804, Peoples R China 2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China 3.Univ Manitoba, Dept Geol Sci, Winnipeg, MB R3T 2N2, Canada 4.E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China 5.E China Normal Univ, Shanghai Key Lab Magnet Resonance, Shanghai 200062, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Bing,Ren, Erfeng,Sherriff, Barbara L.,et al. Multinuclear NMR study of Cs-bearing geyserites of the Targejia hot spring cesium deposit in Tibet[J]. AMERICAN MINERALOGIST,2013,98(5-6):907-913.
APA	Zhou, Bing,Ren, Erfeng,Sherriff, Barbara L.,&Yao, Yefeng.(2013).Multinuclear NMR study of Cs-bearing geyserites of the Targejia hot spring cesium deposit in Tibet.AMERICAN MINERALOGIST,98(5-6),907-913.
MLA	Zhou, Bing,et al."Multinuclear NMR study of Cs-bearing geyserites of the Targejia hot spring cesium deposit in Tibet".AMERICAN MINERALOGIST 98.5-6(2013):907-913.