| TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China | |
| X. L. Wu; Y. J. Han; D. W. Meng; W. R. Yang; D. X. Li | |
| 2000 | |
| Source Publication | Acta Geologica Sinica-English Edition
 |
| ISSN | 1000-9515 |
| Volume | 74Issue:2Pages:154-162 |
| Abstract | Transmission electron microscope (TEM) and high resolution transmission electron microscope (HRTEM) analyses have been performed on omphacite from ultra-high pressure (UHP) eclogites at the locality of Shima, Dabie Mountains, China. TEM reveals that the microstructures consist dominantly of dislocation substructures, including free dislocations, loops, tiltwalls, dislocation tangles and subboundaries. They were produced by high-temperature ductile deformation, of which the main mechanism was dislocation creep. Antiphase domain (APD) boundaries are common planar defects; an age of 470 +/- 6 Ma for UHP eclogite formation has been obtained from the equiaxial size of APDs in ordered omphacites from Shima, coincident with ages given by single-zircon U-Pb dating (471 +/- 2 Ma). HRTEM reveals C2/c and P2/n space groups in different parts of one single omphacite crystal, and no exsolution is observed in the studied samples, which is attributed to rapid cooling. It is suggested that the UHP eclogites underwent a long period of annealing at high temperatures, followed by relatively rapid cooling. These data provide valuable information for the formation and exhumation mechanism of UHP eclogites in the Dabie high-pressure (HP) and UHP metamorphic belt. |
| description.department | china univ geosci, test ctr, wuhan 430074, hubei, peoples r china. china univ geosci, fac earth sci, wuhan 430074, hubei, peoples r china. chinese acad sci, inst met res, atom imaging solids lab, shenyang 110015, liaoning, peoples r china.;wu, xl (reprint author), china univ geosci, test ctr, wuhan 430074, hubei, peoples r china |
| Keyword | Uhp Eclogite Omphacite Tem And hrTem Dabie Mountains High-temperature Deformation Naturally Deformed Omphacites Diopside Single-crystal Dislocation Glide Transformation Consequences Mechanisms Rocks Shan |
| URL | 查看原文 |
| WOS ID | WOS:000088935900008 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/37209 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | X. L. Wu,Y. J. Han,D. W. Meng,et al. TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China[J]. Acta Geologica Sinica-English Edition,2000,74(2):154-162. |
| APA | X. L. Wu,Y. J. Han,D. W. Meng,W. R. Yang,&D. X. Li.(2000).TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China.Acta Geologica Sinica-English Edition,74(2),154-162. |
| MLA | X. L. Wu,et al."TEM and HRTEM study of microstructures in omphacite from UHP eclogites at Shima, Dabie Mountains, China".Acta Geologica Sinica-English Edition 74.2(2000):154-162. |
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