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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
发表期刊GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
ISSN1525-2027
卷号19期号:11页码:4385-4399
通讯作者Zhang, Guo-Liang(zhangguoliang@qdio.ac.cn)
摘要The 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.
关键词olivine pyroxenite asthenosphere fossil ridge hot spot South China Sea
DOI10.1029/2018GC007570
收录类别SCI
语种英语
资助项目National 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] ; National 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研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000452727800015
出版者AMER GEOPHYSICAL UNION
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被引频次:26[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/155832
专题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
通讯作者Zhang, Guo-Liang
作者单位1.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
第一作者单位深海极端环境与生命过程研究中心
通讯作者单位深海极端环境与生命过程研究中心
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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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