Geochemical characteristics of major and trace elements in the Okinawa Trough basaltic glass
文献类型：CNKI期刊论文
| 作者 | GUO Kun; ZHAI Shikui; YU Zenghui; ZENG Zhigang; WANG Xiaoyuan; YIN Xuebo |
| 发表日期 | 2018-02-15 |
| 出处 | Acta Oceanologica Sinica
 |
| 关键词 | Okinawa Trough basaltic glass geochemistry magmatic evolution subducted component |
| 英文摘要 | The Okinawa Trough(OT) is a back-arc basin at an initial spreading stage that is under the influence of subduction of the Philippine Sea Plate. In this study, we analyzed the geochemical compositions of basaltic glass in the OT and discussed the effects of different magmatic sources, evolution, and subducted components in basalts. Our results showed that the middle and southern regions of the OT exhibit characteristics consistent with an iron-rich tholeiite series. Trace element proportions conform to the typical spider diagram pattern characteristic of back-arc basin basalts, rich in large ion lithophile elements(LILEs) including Rb, Ba, Pb, U, and Th, while depleted in high field-strength elements(HFSEs) including Nb, Ta, Zr, Hf, and Ti. The distribution of rare earth elements(REEs) is also consistent with enrichment by right-leaning light rare earth elements(LREEs).The addition of enriched mantle type I(EMI) materials as well as mantle heterogeneity may have led to variable degrees of enrichment in different regions. The magma source of the middle trough has undergone crystallization towards pyroxene, while development of plagioclase was restricted partly, and the crystallization of spinel and olivine ceased altogether. At the same time, crystallization of the southern OT magma source was dominated by olivine and including the formation of plagioclase, pyroxene, and magnetite(or titanomagnetite). Finally, the results of this study showed that 90% Th, 95% Ba in the southern basalt, 50%–70% Th and 70%–90% Ba in the middle basalt originated from subducted component. Different subducted component influence may be due to different subduction zone structural feature. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | The National Basic Research Program of China under contract No.2013CB429702 ; the open fund project supported by the Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology under contract No.MGQNLM-KF201707 ; the National Natural Science Foundation of China under contract Nos 41476044,41325021 and 41306053 ; the Special Fund for the Taishan Scholar Program of Shandong Province under contract No.ts201511061 ; the AoShan Talents Program supported by Qingdao National Laboratory for Marine Science and Technology under contract No.2015ASTP-0S17 ; the Innovative Talent Promotion Program under contract No.2012RA2191 ; the Science and Technology Development Program of Shandong Province under contract No.2013GRC31502 |
| 卷 | v.37期:02页:18-28 |
| 语种 | 英文; |
| 分类号 | P736.4 |
| ISSN号 | 0253-505X |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/189013]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.LaboratoryforMarineGeology,QingdaoNationalLaboratoryforMarineScienceandTechnology 3.KeyLaboratoryofSubmarineGeosciencesandProspectionofMinistryofEducation,OceanUniversityofChina |
| 推荐引用方式 GB/T 7714 | GUO Kun,ZHAI Shikui,YU Zenghui,et al. Geochemical characteristics of major and trace elements in the Okinawa Trough basaltic glass. 2018. |
入库方式： OAI收割
来源：海洋研究所
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