IOCAS-IR  > 海洋地质与环境重点实验室
Geochemical and chronological constraints on the mantle plume origin of the Caroline Plateau
Zhang, Guoliang1,2,3,4; Zhang, Ji1,2,5; Wang, Shuai1,2,5; Zhao, Jianxin6
2020-05-05
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume540Pages:13
Corresponding AuthorZhang, Guoliang(zhangguoliang@qdio.ac.cn)
AbstractThe genesis of an oceanic plateau provides important information on the composition and melting dynamics of the deep mantle. The Caroline Rise, consisting of the West and the East Caroline Ridges, has played an important role in the evolution of the subduction system of the western Pacific; however, the nature and origin of the Caroline Rise are poorly known. Here, on the basis of seafloor sampling, we confirm for the first time that the Caroline Rise represents an oceanic plateau (the Caroline Plateau) that formed as a large igneous province. The Caroline Plateau is connected with the Caroline Seamount Chain to the east, and the seamount chain formed above a deep-rooted hotspot. To investigate the nature of the mantle source of the Caroline Plateau and its genetic relationship with the Caroline Seamount/Island Chain, we age-dated basalt samples from the Caroline Plateau and analyzed their major and trace elements and Sr-Nd-Pb-Hf isotopes. The samples can be classified as alkali or tholeiitic basalt. The tholeiitic basalts (15.62 +/- 3.16 to 19.26 +/- 0.35 Ma) are older than the alkali basalts (8.13 +/- 0.81 Ma) and the volcanics of the Caroline Seamounts/Islands to the east. The tholeiitic basalts have trace element patterns similar to those of basalts of the Ontong Java Plateau. We suggest that the tholeiitic basalts represent the main stage of volcanism on the Caroline Plateau and the alkali basalts the late stage. The alkali basalts of the plateau have isotopic compositions similar to those of the basalts of the Caroline Islands, indicating an origin from the same enriched mantle end-member. The tholeiitic basalts with a MORB-like depleted geochemistry indicate the involvement of depleted components in their mantle source, and the Sr-Nd-Pb-Hf isotope compositions of the tholeiitic basalts can be reproduced by mixing alkali basalt with a depleted MORB mantle component. Based on the relatively low Sm/Yb ratios of the two groups of basalts, the Caroline Plateau is inferred to have formed on a young Caroline Plate with a thin lithosphere. We suggest that the geochemistry and ages of formation of volcanic rocks in the Caroline Plateau/Seamount system can be explained by the activities of the Caroline hotspot. The volcanic rocks of the Caroline Plateau and Islands show increasing alkalinity and Sm/Yb ratios with time, which reflect thickening of the lithosphere and decreasing activity of the Caroline mantle plume.
KeywordAlkali basalt Age dating Geochemistry Hotspot Mantle plume Caroline Plateau
DOI10.1016/j.chemgeo.2020.119566
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[91858206] ; National Natural Science Foundation of China[41876040] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA220500101] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030103] ; Taishan Scholars Program of Shandong Province ; Senior User Project of RV KEXUE Altis, 1999[KEXUE2018G09]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000525365400003
PublisherELSEVIER
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/167203
Collection海洋地质与环境重点实验室
深海极端环境与生命过程研究中心
Corresponding AuthorZhang, Guoliang
Affiliation1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266000, Peoples R China
4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Univ Queensland, Ctr Microscopy & Microanal, Radiogen Isotope Lab, Brisbane, Qld 4072, Australia
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang, Guoliang,Zhang, Ji,Wang, Shuai,et al. Geochemical and chronological constraints on the mantle plume origin of the Caroline Plateau[J]. CHEMICAL GEOLOGY,2020,540:13.
APA Zhang, Guoliang,Zhang, Ji,Wang, Shuai,&Zhao, Jianxin.(2020).Geochemical and chronological constraints on the mantle plume origin of the Caroline Plateau.CHEMICAL GEOLOGY,540,13.
MLA Zhang, Guoliang,et al."Geochemical and chronological constraints on the mantle plume origin of the Caroline Plateau".CHEMICAL GEOLOGY 540(2020):13.
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