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DOI | 10.1038/NGEO3054 |
Early Earth mantle heterogeneity revealed by light oxygen isotopes of Archaean komatiites | |
Byerly, Benjamin L.1; Kareem, Keena1; Bao, Huiming1,2; Byerly, Gary R.1 | |
2017-11-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | Geodynamic processes on early Earth, especially the interaction between the crust and deep mantle, are poorly constrained and subject to much debate. The rarity of fresh igneous materials more than 3 billion years old accounts for much of this uncertainty. Here we examine 3.27-billion-year-old komatiite lavas from Weltevreden Formation in the Barberton greenstone belt, which is part of the Kaapvaal Craton in Southern Africa. We show that primary magmatic compositions of olivine are well preserved in these lavas based on major and trace element systematics. These komatiitic lavas represent products of deep mantle plumes. Oxygen isotope compositions (delta O-18) of the fresh olivine measured by laser fluorination are consistently lighter (about 2 parts per thousand) than those obtained from modern mantle-derived volcanic rocks. These results suggest a mantle source for the Weltevreden komatiites that is unlike the modern mantle and one that reflects mantle heterogeneity left over from a Hadean magma ocean. The anomalously light delta O-18 may have resulted from fractionation of deep magma ocean phases, as has been proposed to explain lithophile and siderophile isotope compositions of Archaean komatiites. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000414031600019 |
WOS关键词 | BARBERTON GREENSTONE-BELT ; OCEANIC-CRUST ; SOUTH-AFRICA ; DEEP-MANTLE ; ELEMENT SYSTEMATICS ; SEAWATER ; RATIOS ; MODEL ; ROCKS ; GEOCHEMISTRY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/35177 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA; 2.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China |
推荐引用方式 GB/T 7714 | Byerly, Benjamin L.,Kareem, Keena,Bao, Huiming,et al. Early Earth mantle heterogeneity revealed by light oxygen isotopes of Archaean komatiites[J]. NATURE GEOSCIENCE,2017,10(11). |
APA | Byerly, Benjamin L.,Kareem, Keena,Bao, Huiming,&Byerly, Gary R..(2017).Early Earth mantle heterogeneity revealed by light oxygen isotopes of Archaean komatiites.NATURE GEOSCIENCE,10(11). |
MLA | Byerly, Benjamin L.,et al."Early Earth mantle heterogeneity revealed by light oxygen isotopes of Archaean komatiites".NATURE GEOSCIENCE 10.11(2017). |
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