Coexisting carbonate-bearing eclogite and blueschist in SW Tianshan, China: Petrology and phase equilibria
文献类型：期刊论文
| 作者 | Li, Ji-Lei1; Klemd, Reiner1; Gao, Jun2; Meyer, Melanie1 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2012-10-22 |
| 卷号 | 60页码:174-187 |
| 关键词 | Eclogite Omphacite-bearing blueschist Coexistence Pseudosection Tianshan (ultra-)high-pressure/low-temperature belt |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2012.08.015 |
| 文献子类 | Article |
| 英文摘要 | Carbonate-bearing eclogite and blueschist coexist in the same lithological sequence in the Tianshan (ultra-)high-pressure/low-temperature metamorphic belt, northwestern China. Both of them consist of the mineral assemblage garnet + omphacite + dolomite magnesite + phengite +/- paragonite + epidote/clinozoisite + glaucophane +/- barroisite/(Mg-)katophorite + rutile/titanite + pyrite. The eclogite has an omphacite content of ca. 43 vol.% and a glaucophane content of < 1 vol.%. In contrast, the blueschist has an omphacite content of < 8 vol.% and a glaucophane content of ca. 43 vol.%. The blueschist occurs as bands or interlayers in the eclogite. Lawsonite pseudomorphs of epidote/clinozoisite + paragonite assemblages in garnet are commonly observed in the eclogite and blueschist. High carbonate contents in oceanic metabasalts suggest that the precursor basaltic crust has undergone significant hydrothermal alteration prior to subduction. Mineral assemblages and textures show that the omphacite-carbonate-bearing blueschist and the carbonate-bearing eclogite underwent an identical metamorphic evolution. Phase equilibrium modeling in the TiNCaKFMASCHO system further indicates that both the carbonate-bearing eclogite and the omphacite-bearing blueschist equilibrated at peak metamorphic conditions of 540-565 degrees C and 21.8-23.1 kbar. Under these conditions calculated X-CO2 isopleths reveal the presence of a mainly aqueous fluid phase (X-CO2 <= 0.02) for the coexisting eclogite and omphacite-bearing blueschist. The stability of the high-pressure mineral assemblages in the eclogite and the omphacite-bearing blueschist is due to differences of the respective bulk-rock composition (the CaO content in particular). This study suggests that three different kinds of blueschist were formed during subduction and exhumation of the South Tianshan oceanic crust, including prograde blueschist formed prior to eclogitization, retrograde blueschist formed by rehydration of eclogite during exhumation in the subduction channel, and coexisting blueschist with eclogite under peak metamorphic conditions. (C) 2012 Elsevier Ltd. All rights reserved. |
| WOS关键词 | P-T PATH ; FLUID-ROCK INTERACTION ; ULTRAHIGH-PRESSURE METAMORPHISM ; TRACE-ELEMENT MOBILIZATION ; HP-LT ROCKS ; WESTERN TIANSHAN ; NW-CHINA ; MINERAL EQUILIBRIA ; NORTHWESTERN CHINA ; SOUTH TIANSHAN |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000313766700012 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | Deutsche Forschungsgemeinschaft(KL692/17-3) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; National Natural Science Foundation of China(41025008) ; National Natural Science Foundation of China(41025008) ; State Key Project for Basic Research of China(2007CB411302) ; State Key Project for Basic Research of China(2007CB411302) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; National Natural Science Foundation of China(41025008) ; National Natural Science Foundation of China(41025008) ; State Key Project for Basic Research of China(2007CB411302) ; State Key Project for Basic Research of China(2007CB411302) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; National Natural Science Foundation of China(41025008) ; National Natural Science Foundation of China(41025008) ; State Key Project for Basic Research of China(2007CB411302) ; State Key Project for Basic Research of China(2007CB411302) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; National Natural Science Foundation of China(41025008) ; National Natural Science Foundation of China(41025008) ; State Key Project for Basic Research of China(2007CB411302) ; State Key Project for Basic Research of China(2007CB411302) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/84254]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Li, Ji-Lei |
| 作者单位 | 1.Univ Erlangen Nurnberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Ji-Lei,Klemd, Reiner,Gao, Jun,et al. Coexisting carbonate-bearing eclogite and blueschist in SW Tianshan, China: Petrology and phase equilibria[J]. JOURNAL OF ASIAN EARTH SCIENCES,2012,60:174-187. |
| APA | Li, Ji-Lei,Klemd, Reiner,Gao, Jun,&Meyer, Melanie.(2012).Coexisting carbonate-bearing eclogite and blueschist in SW Tianshan, China: Petrology and phase equilibria.JOURNAL OF ASIAN EARTH SCIENCES,60,174-187. |
| MLA | Li, Ji-Lei,et al."Coexisting carbonate-bearing eclogite and blueschist in SW Tianshan, China: Petrology and phase equilibria".JOURNAL OF ASIAN EARTH SCIENCES 60(2012):174-187. |
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。