气候变化领域集成服务门户(CCPortal): Highly heterogeneous depleted mantle recorded in the lower oceanic crust

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DOI	10.1038/s41561-019-0368-9
	Highly heterogeneous depleted mantle recorded in the lower oceanic crust
	Lambart S.; Koornneef J.M.; Millet M.-A.; Davies G.R.; Cook M.; Lissenberg C.J.
发表日期	2019
ISSN	17520894
卷号	12 期号:6
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 high-spatial-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. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	clinopyroxene; crustal recycling; gabbro; heterogeneity; lower crust; magma; mantle; mid-ocean ridge basalt; oceanic crust; plagioclase; plate tectonics; Atlantic Ocean; Mid-Atlantic Ridge
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124654
作者单位	Cardiff University, School of Earth and Ocean Sciences, Cardiff, United Kingdom; University of Utah, Department of Geology and Geophysics, Salt Lake City, United States; Vrije Universiteit, Faculty of Science, Amsterdam, Netherlands
推荐引用方式 GB/T 7714	Lambart S.,Koornneef J.M.,Millet M.-A.,et al. Highly heterogeneous depleted mantle recorded in the lower oceanic crust[J],2019,12(6).
APA	Lambart S.,Koornneef J.M.,Millet M.-A.,Davies G.R.,Cook M.,&Lissenberg C.J..(2019).Highly heterogeneous depleted mantle recorded in the lower oceanic crust.Nature Geoscience,12(6).
MLA	Lambart S.,et al."Highly heterogeneous depleted mantle recorded in the lower oceanic crust".Nature Geoscience 12.6(2019).