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	13c nmr spectra of tectonic coals and the effects of stress on structural components
	Ju, YW; Jiang, B; Hou, QL; Wang, GL; Ni, SQ
刊名	Science in china series d-earth sciences
	2005-09-01
卷号	48期号:9页码:1418-1437
关键词	Tectonic coal Nmr Macromolecular structure Chemical component Stress effect
ISSN号	1006-9313
通讯作者	Ju, yw(juyw@gscas.ac.cn)
英文摘要	High-resolution c-13 nuclear magnetic resonance (nmr) spectra of different kinds of tectonic coals were obtained using the nmr (cp/mas+toss) method. on the basis of this, after simulation synthesis and division of spectra, the relative contents of carbon functional groups were calculated. combined with results of ro(max), xrd testing and element analysis, stress effects on the composition of macromolecular structures in tectonic coals were studied further. the results showed that ro, max was not only the important index for describing coal rank, but was also effective for estimating the stress effect of tectonic coals. under tectonic stress action, r,, max was the most direct indicator of the coal structure and chemical components. changes in the stacking l-c of the coal basic structure unit (bsu) and l-a/l-c parameters could distinguish the temperature and stress effects on metamorphic-deformed environments, and reflected the degree of structural deformation. therefore, on the whole, lc and la/lc can be used to index of the degree of structural deformation of tectonic coals. in different metamorphic and deformed environments, different kinds of tectonic coals are formed under structural stress. the changes in characteristics of the macromolecular structure and chemical composition are such that as the increase in structural deformation becomes stronger, from the brittle deformation coal to ductile deformation coal, the ratio of width at the half height of the aromatic carbon and aliphatic carbon peaks (h-fa/h-fal) was increased. as carbon aromaticity was raised further, carbon aliphaticity reduced obviously and different compositions of macromolecular structure appeared as a jump and wave pattern except for in wrinkle structure coal, which might result chiefly from stress effects on the macromolecular structure of different kinds of tectonic coals. the macromoecular changes of wrinkle structure coal are reflected mainly on physical structure. in the metamorphic and deformed environments of the middle and high rank coals, different kinds of tectonic coals, when compared with the metamorphic and deformed environments of low rank coal, have a greater change in h-fa/h-fal, carbon aromaticity, carbon aliphaticity and a different composition of macromolecular structure. so these parameters can be used to estimate increases of coal rank, and to a certain degree, the stress effects on structural components of tectonic coals.
WOS关键词	NUCLEAR-MAGNETIC-RESONANCE ; STATE C-13 NMR ; DEFORMATION DOMAIN ; AUSTRALIAN COALS ; PREMIUM COALS ; SHEAR ZONE ; SPECTROSCOPY ; ASSOCIATION ; COALFIELD ; MACERALS
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000233073800010
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2377291
专题	中国科学院大学
通讯作者	Ju, YW
作者单位	1.China Univ Min & Technol, Coll Mineral Resources & Geosci, Xuzhou 221008, Peoples R China 2.Chinese Acad Sci, Coll Geosci, Grad Sch, Lab Computat Geodynam, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Ju, YW,Jiang, B,Hou, QL,et al. 13c nmr spectra of tectonic coals and the effects of stress on structural components[J]. Science in china series d-earth sciences,2005,48(9):1418-1437.
APA	Ju, YW,Jiang, B,Hou, QL,Wang, GL,&Ni, SQ.(2005).13c nmr spectra of tectonic coals and the effects of stress on structural components.Science in china series d-earth sciences,48(9),1418-1437.
MLA	Ju, YW,et al."13c nmr spectra of tectonic coals and the effects of stress on structural components".Science in china series d-earth sciences 48.9(2005):1418-1437.

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