Growth of metamorphic and peritectic garnets in ultrahigh-pressure metagranite during continental subduction and exhumation in the Dabie orogen
文献类型：期刊论文
| 作者 | Xia, Qiong-Xia1,2; Wang, Hao-Zheng3; Zhou, Li-Gang1,4; Gao, Xiao-Ying1; Zheng, Yong-Fei1; Van Orman, James Ashton5; Xu, Haijun6; Hu, Zhaochu6 |
| 刊名 | LITHOS
 |
| 出版日期 | 2016-12-01 |
| 卷号 | 266页码:158-181 |
| 关键词 | Partial melting Peritectic garnet Metamorphic garnet Ultrahigh pressure Dissolution-reprecipitation |
| DOI | 10.1016/j.lithos.2016.08.043 |
| 文献子类 | Article |
| 英文摘要 | Two generations of garnet are recognized in ultrahigh-pressure (UHP) metagranite from the Dabie orogen by a combined study of petrography, major and trace element profiles in garnet, and phase equilibrium modeling for metagranite. The results enable distinction between metamorphic and peritectic garnet on the basis of BSE images, and major and trace element compositions. Our research provides new insights into the growth of anatectic garnet due to dehydration melting of UHP metamorphic rocks during exhumation from mantle depths. The first generation of garnet (Grt-1) occurs as a broad domain in the center, which is related to metamorphic growth during prograde subduction. This garnet is dark in BSE images, rich in grossular and poor in almandine and pyrope. The chondrite-normalized rare earth element (REE) patterns show LREE depletion and flat MREE-HREE patterns. The second generation of garnet (Grt-II) occurs as a rim of euhedral garnet, or as patches in Grt-I domains, recrystallized after dissolution of preexisting metamorphic garnet in the presence of anatectic melts during exhumation. It is bright in BSE images, poor in grossular, and rich in almandine and pyrope contents. Trace element analyses on Grt-II domains yield high contents of Sc, Cr, Y and HREE and low contents of Ti and MREE. The chondrite-normalized REE patterns exhibit LREE depletion, and steep MREE-HREE patterns. Based on REE partitioning between garnet and zircon/titanite, the last growth times for metamorphic and anatectic garnets are constrained by zircon and titanite U-Pb ages to be similar to 240 Ma and similar to 220 Ma, respectively. Based on anatectic microstructures and a modeled P-T pseudosection, it is suggested that dehydration melting occurred at 2.0-2.5 GPa during exhumation. Melting occurred through the breakdown of phengite via the peritectic reaction: garnet (I) + phengite + plagioclase + quartz -> garnet (II) + biotite + K-feldspar + melt. (C) 2016 Elsevier B.V. All rights reserved. |
| WOS关键词 | MULTIPHASE SOLID INCLUSIONS ; SM-ND GEOCHRONOLOGY ; HIGH-GRADE METAMORPHISM ; EAST-CENTRAL CHINA ; SULU UHP TERRANE ; ABLATION-ICP-MS ; COUPLED LU-HF ; U-PB ISOTOPE ; TRACE-ELEMENT ; MINERAL INCLUSIONS |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000390724200010 |
| 资助机构 | Chinese Ministry of Science and Technology(2015CB856100) ; Chinese Ministry of Science and Technology(2015CB856100) ; Natural Science Foundation of China(41272082 ; Natural Science Foundation of China(41272082 ; 41590620) ; 41590620) ; Chinese Ministry of Science and Technology(2015CB856100) ; Chinese Ministry of Science and Technology(2015CB856100) ; Natural Science Foundation of China(41272082 ; Natural Science Foundation of China(41272082 ; 41590620) ; 41590620) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/53162]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China 2.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing, Jiangsu, Peoples R China 3.Southwest Petr Univ, Sch Geosci & Technol, Chengdu 610500, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 5.Case Western Reserve Univ, Dept Earth Environm & Planetary Sci, 10900 Euclid Ave, Cleveland, OH 44106 USA 6.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xia, Qiong-Xia,Wang, Hao-Zheng,Zhou, Li-Gang,et al. Growth of metamorphic and peritectic garnets in ultrahigh-pressure metagranite during continental subduction and exhumation in the Dabie orogen[J]. LITHOS,2016,266:158-181. |
| APA | Xia, Qiong-Xia.,Wang, Hao-Zheng.,Zhou, Li-Gang.,Gao, Xiao-Ying.,Zheng, Yong-Fei.,...&Hu, Zhaochu.(2016).Growth of metamorphic and peritectic garnets in ultrahigh-pressure metagranite during continental subduction and exhumation in the Dabie orogen.LITHOS,266,158-181. |
| MLA | Xia, Qiong-Xia,et al."Growth of metamorphic and peritectic garnets in ultrahigh-pressure metagranite during continental subduction and exhumation in the Dabie orogen".LITHOS 266(2016):158-181. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。