Genesis of Intermediate and Silicic Arc Magmas Constrained by Nb/Ta Fractionation
文献类型：期刊论文
| 作者 | Chen, Wei1,2; Zhang, Guoliang1,2,3,4; Ruan, Mengfei5; Wang, Shuai1,2; Xiong, Xiaolin5 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2021-03-01 |
| 卷号 | 126期号:3页码:15 |
| 关键词 | amphibole arc magma continental crust Nb Ta differentiation rutile |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2020JB020708 |
| 通讯作者 | Zhang, Guoliang(zhangguoliang@qdio.ac.cn) |
| 英文摘要 | Resolving the geochemical discrepancies in Nb/Ta between the bulk continental crust and its parental mantle melts can provide insights into the processes by which basaltic magmas differentiated into the felsic crust. Deep-seated garnet pyroxenite cumulates (i.e., arclogite) have high Nb/Ta values due to the presence of high Nb/Ta-rutile. For this reason, rutile-bearing arclogites having Nb-rich composition were proposed to complement the low Nb/Ta nature of the continental crust and evolved arc magmas, that is to say, continental arc magma evolution dominantly occurred in the stability field of garnet. However, this suggestion is challenged by the incomplete understanding of the role of rutile in the Nb/Ta fractionation during arc magma evolution due to insufficient partitioning data at low temperatures (T <= 1,000 degrees C). Here, we determined Nb and Ta partitioning ratios in rutile-felsic melt systems at 2.0 GPa, 850-1,000 degrees C and similar to 4-20 wt.% H2O. Our results confirm that equilibrium crystallization of rutile with respect to Nb and Ta will not impart lower Nb/Ta values to any derivative liquids, whereas diffusive fractionation of Nb/Ta in siliceous melts during the growth of rutile can reduce Nb/Ta ratios in melts. However, a positive correlation between Nb/Ta and Dy/Yb for mature continental arc magmas, incipient continental arc magmas, island arc magmas, and global arc magmas indicates that amphibole rather than rutile-bearing arclogite was responsible for causing low Nb/Ta ratios of many evolved intermediate rocks. Accordingly, the chemical differentiation from primary basaltic to average andesitic compositions of the continental crust mainly occurred in the stability field of amphibole. |
| 资助项目 | National Key Research and Development Program of China[2018YFA0702704] ; National Natural Science Foundation of China (NSFC)[91858206] ; National Natural Science Foundation of China (NSFC)[92062222] ; National Natural Science Foundation of China (NSFC)[42003049] ; Key Research Project of Frontier Science of the Chinese Academy of Sciences[QYZDJ-SSW-DQC012] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050101] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020302] ; Taishan Scholars Program of Shandong Province[tsqn201909157] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000638091600006 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/170516]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Zhang, Guoliang |
| 作者单位 | 1.Chinese Acad Sci, Ctr Deep Sea Res, Qingdao, Peoples R China 2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Wei,Zhang, Guoliang,Ruan, Mengfei,et al. Genesis of Intermediate and Silicic Arc Magmas Constrained by Nb/Ta Fractionation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(3):15. |
| APA | Chen, Wei,Zhang, Guoliang,Ruan, Mengfei,Wang, Shuai,&Xiong, Xiaolin.(2021).Genesis of Intermediate and Silicic Arc Magmas Constrained by Nb/Ta Fractionation.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(3),15. |
| MLA | Chen, Wei,et al."Genesis of Intermediate and Silicic Arc Magmas Constrained by Nb/Ta Fractionation".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.3(2021):15. |
入库方式： OAI收割
来源：海洋研究所
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