Geochemical constraints on CO_2-rich mantle source for the Kocebu Seamount,Magellan Seamount chain in the western Pacific

IOCAS-IR

	Geochemical constraints on CO_2-rich mantle source for the Kocebu Seamount,Magellan Seamount chain in the western Pacific
	LIU Yuhao ; ZHANG Guoliang ; ZHANG Ji ; WANG Shuai
发表期刊	Journal of Oceanology and Limnology
ISSN	2096-5508
	2020-07-15
出版年	2020
卷号	v.38 期号:04 页码:306-349
文献类型	CNKI期刊论文
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.
关键词	alkaline oceanic island basalts(OIBs) carbonatite geochemistry mantle source Magellan Seamounts
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;A011;
CNKI专题名称	海洋学;地质学;
分类号	P59;P736
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	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)
文献类型	CNKI期刊论文
条目标识符	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.