Isotopic homogeneity of iron in the early solar nebula

被引:146
作者
Zhu, XK [1 ]
Guo, Y [1 ]
O'Nions, RK [1 ]
Young, ED [1 ]
Ash, RD [1 ]
机构
[1] Univ Oxford, Dept Earth Sci, Oxford OX1 3PR, England
关键词
D O I
10.1038/35085525
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
The chemical and isotopic homogeneity of the early solar nebula, and the processes producing fractionation during its evolution, are central issues of cosmochemistry. Studies of the relative abundance variations of three or more isotopes of an element can in principle determine if the initial reservoir of material was a homogeneous mixture or if it contained several distinct sources of precursor material. For example, widespread anomalies(1-4) observed in the oxygen isotopes of meteorites have been interpreted as resulting from the mixing of a solid phase that was enriched in O-16 with a gas phase in which O-16 was depleted(1-3), or as an isotopic 'memory' of Galactic evolution(5). In either case, these anomalies are regarded as strong evidence that the early solar nebula was not initially homogeneous. Here we present measurements of the relative abundances of three iron isotopes in meteoritic and terrestrial samples. We show that significant variations of iron isotopes exist in both terrestrial and extraterrestrial materials. But when plotted in a three-isotope diagram, all of the data for these Solar System materials fall on a single mass-fractionation line, showing that homogenization of iron isotopes occurred in the solar nebula before both planetesimal accretion and chondrule formation.
引用
收藏
页码:311 / 313
页数:3
相关论文
共 28 条
[1]  
Arnett D., 1996, Supernovae and Nucleosynthesis: An Investigation of the History of Matter from the Big Bang to the Present
[2]   Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17O compositions [J].
Bao, HM ;
Campbell, DA ;
Bockheim, JG ;
Thiemens, MH .
NATURE, 2000, 407 (6803) :499-502
[3]   Anomalous 17O compositions in massive sulphate deposits on the Earth [J].
Bao, HM ;
Thiemens, MH ;
Farquhar, J ;
Campbell, DA ;
Lee, CCW ;
Heine, K ;
Loope, DB .
NATURE, 2000, 406 (6792) :176-178
[4]   High precision measurement of iron isotopes by plasma source mass spectrometry [J].
Belshaw, NS ;
Zhu, XK ;
Guo, Y ;
O'Nions, RK .
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, 2000, 197 :191-195
[5]   NICKEL AND CHROMIUM ISOTOPES IN ALLENDE INCLUSIONS [J].
BIRCK, JL ;
LUGMAIR, GW .
EARTH AND PLANETARY SCIENCE LETTERS, 1988, 90 (02) :131-143
[6]   ISOTOPIC ANOMALIES - CHEMICAL MEMORY OF GALACTIC EVOLUTION [J].
CLAYTON, DD .
ASTROPHYSICAL JOURNAL, 1988, 334 (01) :191-195
[7]   OXYGEN ISOTOPE STUDIES OF ORDINARY CHONDRITES [J].
CLAYTON, RN ;
MAYEDA, TK ;
GOSWAMI, JN ;
OLSEN, EJ .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1991, 55 (08) :2317-2337
[8]  
CLAYTON RN, 1993, ANNU REV EARTH PL SC, V21, P115, DOI 10.1146/annurev.ea.21.050193.000555
[9]   ISOTOPIC VARIATIONS IN THE ROCK-FORMING ELEMENTS IN METEORITES [J].
CLAYTON, RN ;
HINTON, RW ;
DAVIS, AM .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1988, 325 (1587) :483-501
[10]   FORMATION OF UREILITES BY NEBULAR PROCESSES [J].
CLAYTON, RN ;
MAYEDA, TK .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1988, 52 (05) :1313-1318