气候变化领域集成服务门户(CCPortal): Hydrous peridotitic fragments of Earth's mantle 660 km discontinuity sampled by a diamond

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DOI	10.1038/s41561-022-01024-y
	Hydrous peridotitic fragments of Earth's mantle 660 km discontinuity sampled by a diamond
	Gu, Tingting; Pamato, Martha G.; Novella, Davide; Alvaro, Matteo; Fournelle, John; Brenker, Frank E.; Wang, Wuyi; Nestola, Fabrizio
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	950
结束页码	+
卷号	15 期号:11 页码:15
英文摘要	The internal structure and dynamics of Earth have been shaped by the 660 km boundary between the mantle transition zone and lower mantle. However, due to the paucity of natural samples from this depth, the nature of this boundary-its composition and volatile fluxes across it-remain debated. Here we analyse the mineral inclusions in a rare type laB gem diamond from the Karowe mine (Botswana). We discovered recovered lower-mantle minerals ringwoodite + ferropericlase + low-Ni enstatite (MgSiO3) in a polyphase inclusion, together with other principal lower-mantle minerals and hydrous phases, place its origin at similar to 23.5 GPa and similar to 1,650 degrees C, corresponding to the depth at the 660 km discontinuity. The petrological character of the inclusions indicates that ringwoodite (similar to MB1.84Fe0.15SiO4) breaks down into bridgmanite (similar to Mg0.93Fe 0.07SiO3) and ferropericlase (similar to Mg0.84Fe0.16O) in a water-saturated environment at the 660 km discontinuity and reveals that the peridotitic composition and hydrous conditions extend at least across the transition zone and into the lower mantle.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000859631400003
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/272615
作者单位	Purdue University System; Purdue University; Purdue University West Lafayette Campus; University of Padua; University of Pavia; University of Wisconsin System; University of Wisconsin Madison
推荐引用方式 GB/T 7714	Gu, Tingting,Pamato, Martha G.,Novella, Davide,et al. Hydrous peridotitic fragments of Earth's mantle 660 km discontinuity sampled by a diamond[J],2022,15(11):15.
APA	Gu, Tingting.,Pamato, Martha G..,Novella, Davide.,Alvaro, Matteo.,Fournelle, John.,...&Nestola, Fabrizio.(2022).Hydrous peridotitic fragments of Earth's mantle 660 km discontinuity sampled by a diamond.NATURE GEOSCIENCE,15(11),15.
MLA	Gu, Tingting,et al."Hydrous peridotitic fragments of Earth's mantle 660 km discontinuity sampled by a diamond".NATURE GEOSCIENCE 15.11(2022):15.