Exhumation P-T path of UHP eclogites in the Hong'an area, western Dabie Mountains, China
文献类型：期刊论文
| 作者 | Liu, JB; Ye, K; Sun, M |
| 刊名 | LITHOS
 |
| 出版日期 | 2006-06-01 |
| 卷号 | 89期号:1-2页码:154-173 |
| 关键词 | UHP metamorphism eclogite coesite P-T path exhumation The Dabie Mountains |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2005.12.002 |
| 文献子类 | Article |
| 英文摘要 | Four generations of mineral assemblages have been identified in ultrahigh-pressure (UHP) eclogites from the Hong'an area, recording four metamorphic stages of the exhumation trajectory, i.e., garnet+omphacite+kyanite+zoisite/epidote+rutile+coesite formed at the UHP stage, garnet+omphacite+paragonite+phengite+amphibole+epidote+quartz at the high-pressure (HP) eclogitic stage, amphibole+epidote+albite-oligoclase+paragonite+quartz at the epidote-amphibolite facies (EA) stage, and actinolite+albite and purnpellyite+albite+K-feldspar+muscovite+chlorite+margarite+epidote+quartz at the greenschist facies (GS) stage. Garnet formed at the UHP stage was overgrown by atoll garnet at the HP stage. X-ray images, mineral compositions and compositional profiles indicate that the UHP garnet experienced a variable Fe-Mg modification in response to Fe-Mg exchange between garnet and omphacite prior to the overgrowth of atoll HP garnet. A volume diffusion zone was also observed between the UHP and HP garnets. The following P-T conditions were estimated for these mineral assemblages: 480 to 560 degrees C and 2.5 to 2.9 GPa with median values of 520 degrees C and 2.8 GPa at UHP stage, 575 to 685 degrees C and 1.6 to 1.9 GPa with the average results of 634 +/- 37 degrees C and 1.8 +/- 0.06 GPa at the HP stage, 500 to 640 degrees C and 0.4 to 1 GPa at the EA stage, and 160 to 320 degrees C and 0.2 to 0.8 GPa at the GS stage. The Hong'an UHP eclogites experienced a temperature increase of over 100 degrees C from the UHP to HP stages and continued to exhume from the HP to EA stages through a process of approximately isothermal depression, which was followed by a significantly cooling from the EA to GS stages. In the process of exhumation, UHP eclogites witnessed a series of events involving fluid influx, resulting in the formation of hydrous minerals at different stages. The nature of fluids changed from K-rich at the HP stage to K-poor at the EA stage and then K-rich again at the GS stage. (c) 2005 Elsevier B.V. All rights reserved. |
| WOS关键词 | PRESSURE METAMORPHIC ROCKS ; COESITE-BEARING ECLOGITES ; SU-LU REGION ; EASTERN CHINA ; MINERAL CHEMISTRY ; NORTHERN HUBEI ; MASS-TRANSFER ; URALS RUSSIA ; GRANULITE ; PHENGITE |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000238476100008 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66800]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Liu, JB |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Tecton Evolut, Beijing 100029, Peoples R China 2.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, JB,Ye, K,Sun, M. Exhumation P-T path of UHP eclogites in the Hong'an area, western Dabie Mountains, China[J]. LITHOS,2006,89(1-2):154-173. |
| APA | Liu, JB,Ye, K,&Sun, M.(2006).Exhumation P-T path of UHP eclogites in the Hong'an area, western Dabie Mountains, China.LITHOS,89(1-2),154-173. |
| MLA | Liu, JB,et al."Exhumation P-T path of UHP eclogites in the Hong'an area, western Dabie Mountains, China".LITHOS 89.1-2(2006):154-173. |
入库方式： OAI收割
来源：地质与地球物理研究所
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