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
Source PublicationLITHOS
Corresponding AuthorChen, Yanhong( ; Niu, Yaoling(
AbstractThe 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.
KeywordZircon U-Pb age Plagiogranite Troodos ophiolite Cyprus
Indexed BySCI
Funding ProjectNational 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 AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000528206200022
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorChen, Yanhong; Niu, Yaoling
Affiliation1.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 AffilicationInstitute 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.
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