Knowledge Management System Of Institute of Oceanology, Chinese Academy of Sciences
| New U-Pb zircon age and petrogenesis of the plagiogranite, Troodos ophiolite, Cyprus | |
| Chen, Yanhong1,2; Niu, Yaoling1,2,3,4; Shen, Fangyu2,3,4; Gao, Yajie3,5; Wang, Xiaohong3,4 | |
| 2020-06-01 | |
| Source Publication | LITHOS
 |
| ISSN | 0024-4937 |
| Volume | 362Pages:11 |
| Corresponding Author | Chen, Yanhong(chenyh@cugb.edu.cn) ; Niu, Yaoling(yaoling.niu@durham.ac.uk) |
| Abstract | The Troodos ophiolite is a classic and is one of the most complete and best-studied ophiolites on Earth. However, there are few studies on the geochronology of the plagiogranite in the Troodos ophiolite. With the advancement of zircon U-Pb in situ dating method developed in recent decades, it is necessary to revisit the age of the plagiogranite. In this study, we carried out detailed petrography, zircon U-Pb dating and mineral compositional analysis for the plagiogranite. Our new zircon ages of similar to 90-91 Ma confirm the previous age data. Our findings also offer new perspectives on the petrogenesis of the Troodos plagiogranite. It is common that some of the Troodos plagiogranite outcrops show intense "epidotization". The Troodos plagiogranite can thus be divided into epidote-free plagiogranite and epidote plagiogranite. Zircons in the epidote plagiogranite have mottled texture with high contents of most elements (especially for P, Y, REEs, Nb and Ta), which differs distinctly from those in the epidote-free plagiogranite with a clean appearance and oscillatory zoning. The two types of zircons all having high Th/U ratio (0.25-1.46 with an average of 0.69) are consistent with being of magmatic origin. The texture and composition of zircons from the epidote plagiogranite suggest that they are crystallized from a highly dissolving agent that transforms existing minerals such as plagioclase and amphiboles while concentrating rare earth elements (REEs) and high field strength elements (HFSEs, including Nb, Ta, Ti, Zr, Hf, Th and U4+) to precipitate accessory minerals such as zircon and titanite as well as the more abundant epidote. The intergrowth of quartz and skeletal plagioclase together with the precipitation of zircon, titanite and epidote indicates that the highly dissolving agent is best understood as late-stage magmatic fluid or more likely supercritical fluid/melt whose nature and origin deserve further investigation. (C) 2020 Elsevier B.V. All rights reserved. |
| Keyword | Zircon U-Pb age Plagiogranite Troodos ophiolite Cyprus |
| DOI | 10.1016/j.lithos.2020.105472 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Nature Science Foundation of China[41130314] ; National Nature Science Foundation of China[41630968] ; Chinese Academy of Sciences Innovation[Y42217101L] ; Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; 111 Project[B18048] |
| WOS Research Area | Geochemistry & Geophysics ; Mineralogy |
| WOS Subject | Geochemistry & Geophysics ; Mineralogy |
| WOS ID | WOS:000528206200022 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/167248 |
| Collection | 中国科学院海洋研究所 |
| Corresponding Author | Chen, Yanhong; Niu, Yaoling |
| Affiliation | 1.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 5.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia |
| Corresponding Author Affilication | Institute of Oceanology, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Chen, Yanhong,Niu, Yaoling,Shen, Fangyu,et al. New U-Pb zircon age and petrogenesis of the plagiogranite, Troodos ophiolite, Cyprus[J]. LITHOS,2020,362:11. |
| APA | Chen, Yanhong,Niu, Yaoling,Shen, Fangyu,Gao, Yajie,&Wang, Xiaohong.(2020).New U-Pb zircon age and petrogenesis of the plagiogranite, Troodos ophiolite, Cyprus.LITHOS,362,11. |
| MLA | Chen, Yanhong,et al."New U-Pb zircon age and petrogenesis of the plagiogranite, Troodos ophiolite, Cyprus".LITHOS 362(2020):11. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment