Dehydroxylation of omphacite of eclogite from the Dabie-Sulu
文献类型：期刊论文
| 作者 | Su, Wen1,2; Zhang, Ming2; Redfern, Simon A. T.2; Bromiley, Geoffrey D.2 |
| 刊名 | LITHOS
 |
| 出版日期 | 2008-09-01 |
| 卷号 | 105期号:1-2页码:181-190 |
| 关键词 | Omphacite Dehydroxylation Oxidation IR spectroscopy Dabie-Sulu |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2008.03.006 |
| 文献子类 | Article |
| 英文摘要 | Dehydroxylation of omphacites in eclogites from UHP Dabie-Sulu terrain has been investigated using a combined method of petrological observations, mineral chemistry, heat treatment, Mossbauer, and micro-FTIR spectroscopy. Progressive heating of omphacite in air up to 1100 degrees C results in complex, multi-stage processes involving oxidation and dehydrogenation at different temperatures. During heating, Fe2+ at the M1 site is oxidized to Fe3+, accompanied by a decrease in the intensity of the 3460 cm(-1) OH band. This reaction can be described as Fe2+(M1)+(OH)(-)=Fe3+(M1)+O2-(O3)+1/2H(2), and most likely represents loss of H bonded to O1 adjacent to the M1 site. At higher temperatures, continued oxidation results in further dehydroxylation due to H loss from CH bands 3530 cm(-1) and 3630 cm(-1). These bands represent H defects with higher thermal stability/slower diffusivity. In this case, oxidation of Fe2+ provides a means for charge-balancing H loss over the whole crystal structure, rather than locally. OH bands at 3530 and 3630 cm(-1) are consistent with H incorporation onto O2, with vibration of CH dipoles towards adjacent tetrahedral vacancies. Rapid loss of H during annealing at even low temperatures implies that significant H loss from eclogites occurs during exhumation. Furthermore, changes in relative CH band intensity are expected during exhumation due to different thermal behaviour of H defects in omphacite. As such, the ratio of OH bands in omphacite spectra could be used to deduce exhumation conditions. (C) 2008 Elsevier B.V. All rights reserved. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; NOMINALLY ANHYDROUS MINERALS ; CENTRAL CHINA ; UPPER-MANTLE ; EASTERN CHINA ; CONTINENTAL-CRUST ; EARTHS MANTLE ; WATER ; HYDROGEN ; DIFFUSION |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000260993100015 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | NNSFC(40572028) ; NNSFC(40572028) ; NNSFC(40572028) ; NNSFC(40572028) ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; NNSFC(40572028) ; NNSFC(40572028) ; NNSFC(40572028) ; NNSFC(40572028) ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; NNSFC(40572028) ; NNSFC(40572028) ; NNSFC(40572028) ; NNSFC(40572028) ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; NNSFC(40572028) ; NNSFC(40572028) ; NNSFC(40572028) ; NNSFC(40572028) ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University ; Key Laboratory of Continental Dynamics in Northwest University |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/69966]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Su, Wen |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England |
| 推荐引用方式 GB/T 7714 | Su, Wen,Zhang, Ming,Redfern, Simon A. T.,et al. Dehydroxylation of omphacite of eclogite from the Dabie-Sulu[J]. LITHOS,2008,105(1-2):181-190. |
| APA | Su, Wen,Zhang, Ming,Redfern, Simon A. T.,&Bromiley, Geoffrey D..(2008).Dehydroxylation of omphacite of eclogite from the Dabie-Sulu.LITHOS,105(1-2),181-190. |
| MLA | Su, Wen,et al."Dehydroxylation of omphacite of eclogite from the Dabie-Sulu".LITHOS 105.1-2(2008):181-190. |
入库方式： OAI收割
来源：地质与地球物理研究所
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