The Provenances of Asteroids, and Their Contributions to the Volatile Inventories of the Terrestrial Planets

被引:503
|
作者
Alexander, C. M. O'D. [1 ]
Bowden, R. [2 ]
Fogel, M. L. [2 ]
Howard, K. T. [3 ,4 ]
Herd, C. D. K. [5 ]
Nittler, L. R. [1 ]
机构
[1] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA
[2] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
[3] Nat Hist Museum, London SW7 5BD, England
[4] CUNY, Kingsborough Community Coll, Brooklyn, NY 11235 USA
[5] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
TAGISH LAKE METEORITE; OXYGEN-ISOTOPE; SOLAR NEBULA; CARBONACEOUS CHONDRITES; ORGANIC-MATTER; LOW-MASS; ORIGIN; WATER; CONSTRAINTS; MIGRATION;
D O I
10.1126/science.1223474
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Determining the source(s) of hydrogen, carbon, and nitrogen accreted by Earth is important for understanding the origins of water and life and for constraining dynamical processes that operated during planet formation. Chondritic meteorites are asteroidal fragments that retain records of the first few million years of solar system history. The deuterium/hydrogen (D/H) values of water in carbonaceous chondrites are distinct from those in comets and Saturn's moon Enceladus, implying that they formed in a different region of the solar system, contrary to predictions of recent dynamical models. The D/H values of water in carbonaceous chondrites also argue against an influx of water ice from the outer solar system, which has been invoked to explain the nonsolar oxygen isotopic composition of the inner solar system. The bulk hydrogen and nitrogen isotopic compositions of CI chondrites suggest that they were the principal source of Earth's volatiles.
引用
收藏
页码:721 / 723
页数:3
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