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DOI | 10.1073/pnas.1719570115 |
Recycled ancient ghost carbonate in the Pitcairn mantle plume | |
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; Takahashi, Toshiro3,7; Senda, Ryoko3,8; Chang, Qing3; Vaglarov, Bogdan S.3; Kimura, Jun-Ichi3 | |
2018-08-28 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:35页码:8682-8687 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Germany; Japan |
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. |
英文关键词 | Pitcairn mantle plume EM1 magnesium isotopes ancient carbonate-bearing sediments |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000442861600040 |
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 |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204975 |
专题 | 地球科学 资源环境科学 气候变化 |
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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