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Barium isotope evidence for pervasive sediment recycling in the upper mantle
Nielsen, Sune G.1,2; Horner, Tristan J.1,3; Pryer, Helena V.1,3; Blusztajn, Jerzy1,2; Shu, Yunchao1,2,4,5; Kurz, Mark D.3; Le Roux, Veronique2
2018-07-01
发表期刊SCIENCE ADVANCES
ISSN2375-2548
卷号4期号:7页码:8
摘要The upper mantle, as sampled by mid-ocean ridge basalts (MORBs), exhibits significant chemical variability unrelated to mechanisms of melt extraction at ridges. We show that barium isotope variations in global MORBs vary systematically with radiogenic isotopes and trace element ratios, which reflects mixing between depleted and enriched MORB melts. In addition, modern sediments and enriched MORBs share similar Ba isotope signatures. Using modeling, we show that addition of-0.1% by weight of sediment components into the depleted mantle in subduction zones must impart a sedimentary Ba signature to the overlying mantle and induce low-degree melting that produces the enriched MORB reservoir. Subsequently, these enriched domains convect toward mid-ocean ridges and produce radiogenic isotope variation typical of enriched MORBs. This mechanism can explain the chemical and isotopic features of enriched MORBs and provide strong evidence for pervasive sediment recycling in the upper mantle.
DOI10.1126/sciadv.aas8675
关键词[WOS]EAST PACIFIC RISE ; MID-ATLANTIC RIDGE ; TRACE-ELEMENT SIGNATURE ; SOUTHWEST INDIAN RIDGE ; BOUVET TRIPLE JUNCTION ; CENTRAL-NORTH-ATLANTIC ; ALTERED OCEANIC-CRUST ; SUBDUCTION ZONES ; MELANGE DIAPIRS ; STABLE-ISOTOPES
语种英语
资助项目NSF[EAR-1119373] ; NSF[EAR-1427310]
WOS研究方向Science & Technology - Other Topics
项目资助者NSF
WOS类目Multidisciplinary Sciences
WOS记录号WOS:000443176100036
出版者AMER ASSOC ADVANCEMENT SCIENCE
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文献类型期刊论文
条目标识符http://ir.qibebt.ac.cn/handle/337004/11982
专题中国科学院青岛生物能源与过程研究所
通讯作者Nielsen, Sune G.
作者单位1.Woods Hole Oceanog Inst, NIRVANA Nontradit Isotope Res Adv Novel Applicat, Woods Hole, MA 02543 USA
2.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
3.Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA
4.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
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GB/T 7714
Nielsen, Sune G.,Horner, Tristan J.,Pryer, Helena V.,et al. Barium isotope evidence for pervasive sediment recycling in the upper mantle[J]. SCIENCE ADVANCES,2018,4(7):8.
APA Nielsen, Sune G..,Horner, Tristan J..,Pryer, Helena V..,Blusztajn, Jerzy.,Shu, Yunchao.,...&Le Roux, Veronique.(2018).Barium isotope evidence for pervasive sediment recycling in the upper mantle.SCIENCE ADVANCES,4(7),8.
MLA Nielsen, Sune G.,et al."Barium isotope evidence for pervasive sediment recycling in the upper mantle".SCIENCE ADVANCES 4.7(2018):8.
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