Earth’s water may have been inherited from material similar to enstatite chondrite meteorites

doi:10.1126/science.aba1948

GSTDTAP > 气候变化

DOI	10.1126/science.aba1948
	Earth’s water may have been inherited from material similar to enstatite chondrite meteorites
	Laurette Piani; Yves Marrocchi; Thomas Rigaudier; Lionel G. Vacher; Dorian Thomassin; Bernard Marty
	2020-08-28
发表期刊	Science
出版年	2020
英文摘要	The abundances of Earth's chemical elements and their isotopic ratios can indicate which materials formed Earth. Enstatite chondrite (EC) meteorites provide a good isotopic match for many elements but are expected to contain no water because they formed in the hot inner Solar System. This would require Earth's water to be from a different source, such as comets. Piani et al. measured hydrogen contents and deuterium/hydrogen ratios (D/H) in 13 EC meteorites (see the Perspective by Peslier). They found far more hydrogen than is commonly assumed, with D/H close to that of Earth's mantle. Combining these data with cosmochemical models, they show that most of Earth's water could have formed from hydrogen delivered by EC meteorites. Science , this issue p. [1110][1]; see also p. [1058][2] The origin of Earth’s water remains unknown. Enstatite chondrite (EC) meteorites have similar isotopic composition to terrestrial rocks and thus may be representative of the material that formed Earth. ECs are presumed to be devoid of water because they formed in the inner Solar System. Earth’s water is therefore generally attributed to the late addition of a small fraction of hydrated materials, such as carbonaceous chondrite meteorites, which originated in the outer Solar System where water was more abundant. We show that EC meteorites contain sufficient hydrogen to have delivered to Earth at least three times the mass of water in its oceans. EC hydrogen and nitrogen isotopic compositions match those of Earth’s mantle, so EC-like asteroids might have contributed these volatile elements to Earth’s crust and mantle. [1]: /lookup/doi/10.1126/science.aba1948 [2]: /lookup/doi/10.1126/science.abc1338
领域	气候变化 ; 资源环境
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/293230
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Laurette Piani,Yves Marrocchi,Thomas Rigaudier,等. Earth’s water may have been inherited from material similar to enstatite chondrite meteorites[J]. Science,2020.
APA	Laurette Piani,Yves Marrocchi,Thomas Rigaudier,Lionel G. Vacher,Dorian Thomassin,&Bernard Marty.(2020).Earth’s water may have been inherited from material similar to enstatite chondrite meteorites.Science.
MLA	Laurette Piani,et al."Earth’s water may have been inherited from material similar to enstatite chondrite meteorites".Science (2020).