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Recycled ancient ghost carbonate in the Pitcairn mantle plume

文献类型：期刊论文

作者Wang, Xiao-Jun1; Chen, Li-Hui1; Hofmann, Albrecht W.2; Hanyu, Takeshi3; Kawabata, Hiroshi4; Zhong, Yuan1; Xie, Lie-Wen5; Shi, Jin-Hua1; Miyazaki, Takashi3; Hirahara, Yuka3,6
刊名PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
出版日期2018-08-28
卷号115期号:35页码:8682-8687
关键词Pitcairn mantle plume EM1 magnesium isotopes ancient carbonate-bearing sediments
ISSN号0027-8424
DOI10.1073/pnas.1719570115
英文摘要The extreme Sr, Nd, Hf, and Pb isotopic compositions found in Pitcairn Island basalts have been labeled enriched mantle 1 (EM1), characterizing them as one of the isotopic mantle end members. The EM1 origin has been vigorously debated for over 25 years, with interpretations ranging from delaminated subcontinental lithosphere, to recycled lower continental crust, to recycled oceanic crust carrying ancient pelagic sediments, all of which may potentially generate the requisite radiogenic isotopic composition. Here we find that delta Mg-26 ratios in Pitcairn EM1 basalts are significantly lower than in normal mantle and are the lowest values so far recorded in oceanic basalts. A global survey of Mg isotopic compositions of potentially recycled components shows that marine carbonates constitute the most common and typical reservoir invariably characterized by extremely low delta Mg-26 values. We therefore infer that the subnormal delta Mg-26 of the Pitcairn EM1 component originates from subducted marine carbonates. This, combined with previously published evidence showing exceptionally unradiogenic Pb as well as sulfur isotopes affected by mass-independent fractionation, suggests that the Pitcairn EM1 component is most likely derived from late Archean subducted carbonate-bearing sediments. However, the low Ca/Al ratios of Pitcairn lavas are inconsistent with experimental evidence showing high Ca/Al ratios in melts derived from carbonate-bearing mantle sources. We suggest that carbonate-silicate reactions in the late Archean subducted sediments exhausted the carbonates, but the isotopically light magnesium of the carbonate was incorporated in the silicates, which then entered the lower mantle and ultimately became the Pitcairn plume source.
WOS关键词OCEAN ISLAND BASALTS ; MAGNESIUM ISOTOPE FRACTIONATION ; PARTIAL MELTING EXPERIMENTS ; ECLOGITE XENOLITHS ; CONTINENTAL-CRUST ; KAAPVAAL CRATON ; MAJOR ELEMENTS ; 3 GPA ; LAVAS ; GEOCHEMISTRY
资助项目National Natural Science Foundation of China[41372064] ; National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[41672049] ; Programme of Introducing Talents of Discipline to Universities of China[B13021] ; Program A for Outstanding PhD Candidate of Nanjing University[201701A005]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:000442861600040
出版者NATL ACAD SCIENCES
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Programme of Introducing Talents of Discipline to Universities of China ; Programme of Introducing Talents of Discipline to Universities of China ; Program A for Outstanding PhD Candidate of Nanjing University ; Program A for Outstanding PhD Candidate of Nanjing University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Programme of Introducing Talents of Discipline to Universities of China ; Programme of Introducing Talents of Discipline to Universities of China ; Program A for Outstanding PhD Candidate of Nanjing University ; Program A for Outstanding PhD Candidate of Nanjing University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Programme of Introducing Talents of Discipline to Universities of China ; Programme of Introducing Talents of Discipline to Universities of China ; Program A for Outstanding PhD Candidate of Nanjing University ; Program A for Outstanding PhD Candidate of Nanjing University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Programme of Introducing Talents of Discipline to Universities of China ; Programme of Introducing Talents of Discipline to Universities of China ; Program A for Outstanding PhD Candidate of Nanjing University ; Program A for Outstanding PhD Candidate of Nanjing University
源URL[http://ir.iggcas.ac.cn/handle/132A11/88115]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Chen, Li-Hui; Hofmann, Albrecht W.
作者单位1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Jiangsu, Peoples R China
2.Max Planck Inst Chem, Abt Klimageochem, D-55128 Mainz, Germany
3.Japan Agcy Marine Earth Sci & Technol, Dept Solid Earth Geochem, Yokosuka, Kanagawa 2370061, Japan
4.Kochi Univ, Fac Sci & Technol, Kochi 7808520, Japan
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.Chiba Inst Technol, Narashino, Chiba 2750016, Japan
7.Niigata Univ, Dept Geol, Niigata 9502181, Japan
8.Kyushu Univ, Fac Social & Cultural Studies, Fukuoka, Fukuoka 8190395, Japan
推荐引用方式
GB/T 7714		 Wang, Xiao-Jun,Chen, Li-Hui,Hofmann, Albrecht W.,et al. Recycled ancient ghost carbonate in the Pitcairn mantle plume[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(35):8682-8687.
APA Wang, Xiao-Jun.,Chen, Li-Hui.,Hofmann, Albrecht W..,Hanyu, Takeshi.,Kawabata, Hiroshi.,...&Kimura, Jun-Ichi.(2018).Recycled ancient ghost carbonate in the Pitcairn mantle plume.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(35),8682-8687.
MLA Wang, Xiao-Jun,et al."Recycled ancient ghost carbonate in the Pitcairn mantle plume".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.35(2018):8682-8687.

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来源：地质与地球物理研究所

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