Homogeneous Distribution of 26Al in the Solar System from the Mg Isotopic Composition of Chondrules

被引：273

作者：

Villeneuve, Johan ^{[1
]}

Chaussidon, Marc ^{[1
]}

Libourel, Guy ^{[1
,2
]}

机构：

[1] Nancy Univ, CNRS, CRPG, UPR 2300, F-54501 Vandoeuvre Les Nancy, France

[2] Nancy Univ, ENSG, F-54501 Vandoeuvre Les Nancy, France

来源：

SCIENCE | 2009年 / 325卷 / 5943期

基金：

欧洲研究理事会;

关键词：

FERROMAGNESIAN CHONDRULES; REFRACTORY INCLUSIONS; MAGNESIAN CHONDRULES; INITIAL AL-26/AL-27; NEBULA; CHONDRITES; CONSTRAINTS; ORIGIN; CONDENSATION; AL-26-MG-26;

D O I：

10.1126/science.1173907

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 timing of the formation of the first solids in the solar system remains poorly constrained. Micrometer-scale, high-precision magnesium (Mg) isotopic analyses demonstrate that Earth, refractory inclusions, and chondrules from primitive meteorites formed from a reservoir in which short-lived aluminum-26 (Al-26) and Mg isotopes were homogeneously distributed at +/- 10%. This level of homogeneity validates the use of Al-26 as a precise chronometer for early solar system events. High-precision chondrule Al-26 isochrons show that several distinct chondrule melting events took place from similar to 1.2 million years (My) to similar to 4 My after the first solids condensed from the solar nebula, with peaks between similar to 1.5 and similar to 3 My, and that chondrule precursors formed as early as 0.87(-0.16)(+0.19) My after.

引用

页码：985 / 988

页数：4

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