Geochemical constraints on CO_2-rich mantle source for the Kocebu Seamount,Magellan Seamount chain in the western Pacific
文献类型：CNKI期刊论文
| 作者 | LIU Yuhao; ZHANG Guoliang; ZHANG Ji; WANG Shuai |
| 发表日期 | 2020-07-15 |
| 出处 | Journal of Oceanology and Limnology
 |
| 关键词 | alkaline oceanic island basalts(OIBs) carbonatite geochemistry mantle source Magellan Seamounts |
| 英文摘要 | The alkaline oceanic island basalts(OIBs) with under-saturated SiO_2 and high contents of CaO and alkaline are usually attributed to mantle sources different from typical tholeiitic OIBs.Based on the results of high pressure and temperature experiment study,the genesis of silica under-saturated alkaline basaltic melts could be explained by the role of CO_2, thus,the genetic relationship of alkaline basalts with CO_2 has become a topic of relevance because it is closely related to the deep carbon cycle.The Magellan Seamount chain in the West Pacific Seamount Province has wide distribution of alkali basalts.For the first time,we collected alkaline basalt samples from the Kocebu Seamount of the Magellan Seamount chain and found that magmatic apatites widely occur in the less evolved volcanic rock samples,and the high contents of phosphorus should be a feature of the alkaline OIB s of the Magellan Seamounts.Compared with typical OIBs,these alkaline volcanic rocks have higher CaO and P_2 O_5, lower SiO_2 content,negative anomaly of high field strength elements(HFSEs),more distinctly negative anomaly of potassium(K) and the ubiquity of titanaugite,indicating a CO_2-rich mantle source.Based on the relatively high K2 O and TiO_2 contents and La/Yb ratio and low MgO content of these alkaline rocks,we suggest that the volcanic rocks of the Magellan Seamounts are originated from carbonated eclogites derived possibly from ancient subducted altered oceanic crust. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Natural Science Foundation of China (Nos.91858206,41876040) ; the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDA22050101,XDB42020302) ; the Taishan Scholars Program of Shandong Province (No.tsqn201909157) ; Senior User Project of R/V Kexue (No.KEXUE2018G09) ; the Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology (No.MGQNLMTD201806) |
| 卷 | v.38期:04页:306-349 |
| 语种 | 英文; |
| 分类号 | P59;P736 |
| ISSN号 | 2096-5508 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/188124]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.CenterofDeepSeaResearch&KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.UniversityofChineseAcademyofSciences 3.LaboratoryforMarineGeology,QingdaoNationalLaboratoryforMarineScienceandTechnology 4.CenterforOceanMega-Science,ChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | LIU Yuhao,ZHANG Guoliang,ZHANG Ji,et al. Geochemical constraints on CO_2-rich mantle source for the Kocebu Seamount,Magellan Seamount chain in the western Pacific. 2020. |
入库方式： OAI收割
来源：海洋研究所
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