IOCAS-IR  > 海洋地质与环境重点实验室
Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea
Zhang, Guo-Liang1,2,3,4; Sun, Wei-Dong1,2,4; Seward, Gareth5
2018-11-01
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
ISSN1525-2027
Volume19Issue:11Pages:4385-4399
Corresponding AuthorZhang, Guo-Liang(zhangguoliang@qdio.ac.cn)
AbstractThe genesis of seamount chains along fossil spreading ridges reflects the mantle melting dynamics of dying spreading center. The South China Sea developed a seamount chain along its fossil ridge shortly after cessation of spreading. International Ocean Discovery Program Expedition 349 has recovered three volcanic layers, a shallow volcanic breccia layer and two deeper (upper and lower sections) basalt layers, at Site U1431 near the fossil ridge of the South China Sea. Despite the mid-ocean ridge basalt (MORB)-like geochemistry of the lower and upper section basalts, they show distinct geochemical differences that indicate a change of mantle source and a transition from spreading to intraplate volcanism. While the lower section basalts could reflect the last stage volcanism before the cessation of ridge spreading, the upper section basalts with whole-rock MgO up to 20wt.% were formed by intraplate volcanism with significant olivine accumulation once the spreading center had become inactive. The MORB type basalts at Site U1431 have Hawaii-like high olivine Ni and Fe/Mn and low olivine Ca and Mn and bulk-rock low CaO that are distinctly different from normal global MORBs, suggesting an anomalous mantle source in lithology. We suggest that an eclogite-/pyroxenite-rich component, possibly sourced from the Hainan hot spot, played a fundamental role in the transition from spreading to intraplate volcanism of the dying spreading ridge of the South China Sea.
Keywordolivine pyroxenite asthenosphere fossil ridge hot spot South China Sea
DOI10.1029/2018GC007570
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41522602] ; National Natural Science Foundation of China[41376065] ; AoShan Talent Program ; Qingdao National Laboratory for Marine Science and Technology[2015ASTP]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000452727800015
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/155833
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, Guo-Liang
Affiliation1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, 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.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang, Guo-Liang,Sun, Wei-Dong,Seward, Gareth. Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2018,19(11):4385-4399.
APA Zhang, Guo-Liang,Sun, Wei-Dong,&Seward, Gareth.(2018).Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,19(11),4385-4399.
MLA Zhang, Guo-Liang,et al."Mantle Source and Magmatic Evolution of the Dying Spreading Ridge in the South China Sea".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 19.11(2018):4385-4399.
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