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 |
ISSN | 1525-2027 |
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 |
DOI | 10.1029/2018GC007570 |
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 |
引用统计 | |
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 |
推荐引用方式 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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