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DOI | 10.1038/s41561-019-0368-9 |
Highly heterogeneous depleted mantle recorded in the lower oceanic crust | |
Lambart, Sarah1,2; Koornneef, Janne M.3; Millet, Marc-Alban1; Davies, Gareth R.3; Cook, Matthew1; Lissenberg, C. Johan1 | |
2019-06-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:6页码:482-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Wales; USA; Netherlands |
英文摘要 | The Earth's mantle is heterogeneous as a result of early planetary differentiation and subsequent crustal recycling during plate tectonics. Radiogenic isotope signatures of mid-ocean ridge basalts have been used for decades to map mantle composition, defining the depleted mantle endmember. These lavas, however, homogenize via magma mixing and may not capture the full chemical variability of their mantle source. Here, we show that the depleted mantle is significantly more heterogeneous than previously inferred from the compositions of lavas at the surface, extending to highly enriched compositions. We perform highspatial-resolution isotopic analyses on clinopyroxene and plagioclase from lower crustal gabbros drilled on a depleted ridge segment of the northern Mid-Atlantic Ridge. These primitive cumulate minerals record nearly the full heterogeneity observed along the northern Mid-Atlantic Ridge, including hotspots. Our results demonstrate that substantial mantle heterogeneity is concealed in the lower oceanic crust and that melts derived from distinct mantle components can be delivered to the lower crust on a centimetre scale. These findings provide a starting point for re-evaluation of models of plate recycling, mantle convection and melt transport in the mantle and the crust. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000469459600017 |
WOS关键词 | RIDGE BASALT ; MELT TRANSPORT ; ND ISOTOPES ; SR ; PERIDOTITE ; PYROXENITE ; GENESIS ; ISLAND ; FLOW ; 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/183939 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff, S Glam, Wales; 2.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA; 3.Vrije Univ, Fac Sci, Amsterdam, Netherlands |
推荐引用方式 GB/T 7714 | Lambart, Sarah,Koornneef, Janne M.,Millet, Marc-Alban,et al. Highly heterogeneous depleted mantle recorded in the lower oceanic crust[J]. NATURE GEOSCIENCE,2019,12(6):482-+. |
APA | Lambart, Sarah,Koornneef, Janne M.,Millet, Marc-Alban,Davies, Gareth R.,Cook, Matthew,&Lissenberg, C. Johan.(2019).Highly heterogeneous depleted mantle recorded in the lower oceanic crust.NATURE GEOSCIENCE,12(6),482-+. |
MLA | Lambart, Sarah,et al."Highly heterogeneous depleted mantle recorded in the lower oceanic crust".NATURE GEOSCIENCE 12.6(2019):482-+. |
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