Metamorphic evolution of porphyroblastic eclogite in Qinglongshan of Donghai of northern Jiangsu Province
文献类型：期刊论文
| 作者 | Yan Rong1,2; Yang JianJun1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-05-01 |
| 卷号 | 29期号:5页码:1621-1633 |
| 关键词 | Qinglongshan Eclogite Phase diagram modelling Porphyroblast P-T path |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Part eclogites in Qinglongshan are characterized by epidote, kyanite and talc porphyroblast, but their peak metamorphic mineral assemblages are composed of fine-grained garnet + omphacite + phengite + coesite + rutile + epidote in matrix. The minerals in the peak assembkage show shape preferred orientation defining the rock foliation. The peak assemblage defined by garnet compositional isopleths in the calculated phase diagram is garnet + omphacite + phengite + kyanite + rutile + coesite + lawsonite + talc, inconsistent with the petrographic observation. The discrepancy probably resulted from the assumption of pure water to be the ultrahigh-pressure (UHP) fluid phase. The randomly oriented porphyroblasts overprint the rock foliation, implying that they crystallized later than the peak assemblage under a weak shear stress field. Both petrography and phase diagram modelling demonstrate a crystallization sequence of kyanite-epidote-talc. The mode of epidote increases dramatically resulting in the formation of porphyroblasts at <2GPa. The coesite pseudomorphs in the epidote porphyroblasts do not necessarily imply that they crystallized in the stability field of coesite. Rapid decrease in P-T was more likely the cuase of inclusion of the UHP assemblage in the epidote porphyroblasts. The P-T path defined by the mineral assemblages is typically the hair-pin type. Hydrous minerals were present in all the assemblages at different metamorphic stages, their amounts increased during retrogression, implying continuous ingress of fluids into the rock. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; CALCULATED PHASE-EQUILIBRIA ; EASTERN CHINA ; NORTHEASTERN JIANGSU ; SHANDONG PROVINCE ; UHP ECLOGITES ; SOUTHERN SULU ; COESITE ; ROCKS ; TERRANE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000321226200012 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/87714]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Yan Rong |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yan Rong,Yang JianJun. Metamorphic evolution of porphyroblastic eclogite in Qinglongshan of Donghai of northern Jiangsu Province[J]. ACTA PETROLOGICA SINICA,2013,29(5):1621-1633. |
| APA | Yan Rong,&Yang JianJun.(2013).Metamorphic evolution of porphyroblastic eclogite in Qinglongshan of Donghai of northern Jiangsu Province.ACTA PETROLOGICA SINICA,29(5),1621-1633. |
| MLA | Yan Rong,et al."Metamorphic evolution of porphyroblastic eclogite in Qinglongshan of Donghai of northern Jiangsu Province".ACTA PETROLOGICA SINICA 29.5(2013):1621-1633. |
入库方式： OAI收割
来源：地质与地球物理研究所
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