Formation of solar nebula reservoirs by mixing chondritic components

被引:68
作者
Zanda, Brigitte
Hewins, Roger H.
Bourot-Denise, Michele
Bland, Philip A.
Albarede, Francis
机构
[1] MNHN, Lab Etud Matiere Extraterrestre, F-75005 Paris, France
[2] CNRS, UMS2679, F-75005 Paris, France
[3] Rutgers State Univ, Dept Geol Sci, Piscataway, NJ 08855 USA
[4] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, IARC, London SW7 2AZ, England
[5] Nat Hist Museum, Dept Mineral, IARC, London SW7 5BD, England
[6] Ecole Normale Super Lyon, F-69364 Lyon, France
基金
美国国家航空航天局;
关键词
nebular fractionation; oxygen isotopes; chondritic reservoirs; chondrules; chondritic metal; refractory inclusions;
D O I
10.1016/j.epsl.2006.05.016
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We determined proportions of Type 1 (reduced) and Type 11 (oxidized) chondrules in ordinary chondrites (OC) and found linear relationships between chondrule abundances and chondrite bulk chemical and oxygen isotopic compositions. Similar relationships exist between bulk oxygen isotopic compositions of carbonaceous chondrites and modal abundances of their chondritic components (matrix, Type 1 and Type 11 chondrules, refractory calcium-aluminium-rich inclusions and amoeboid olivine aggregates). These correlations can be used to predict the bulk oxygen isotopic composition of chondrites based on their petrology. We can also define model isotopic compositions associated with each petrologic component, which are not their current actual isotopic compositions due to alteration or mixing. These compositions for refractory inclusions and chondrules plot close to a slope I line, consistent with refractory inclusions (RI) forming from an early O-16-rich gas, the evolution of the gas to more O-16-poor compositions, possibly involving photodissociation and subsequent ice transport, followed by chondrule formation. Our results open a new understanding of the oxygen 3-isotope space and explain the unique position of OC as well as the differences between H, L and LL chondrites. They indicate that major chemical and isotopic variations between chondritic reservoirs were established after chondrule and CAI formation. They may have some bearing on the formation of planetary reservoirs: the Delta O-17 calculated for type I chondrules is appropriate for terrestrial planet progenitors, consistent with their chemical similarity to Earth mantle. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:650 / 660
页数:11
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