Osmium isotope evidence for an s-process carrier in primitive chondrites

被引：90

作者：

Brandon, AD

Humayun, M

Puchtel, IS

Leya, I

Zolensky, M

机构：

[1] NASA, Lyndon B Johnson Space Ctr, Houston, TX 77058 USA

[2] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[3] Florida State Univ, Dept Geol Sci, Tallahassee, FL 32310 USA

[4] Univ Maryland, Dept Geol, College Pk, MD 20742 USA

[5] Univ Bern, Inst Phys, CH-3012 Bern, Switzerland

来源：

SCIENCE | 2005年 / 309卷 / 5738期

关键词：

D O I：

10.1126/science.1115053

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：

Osmium extracted from unequilibrated bulk chondrites has isotope anomalies consistent with an insoluble s-process carrier, termed Os(i) here. Osmium from metamorphosed bulk chondrites does not have isotope anomalies, implying that the Os(i) carrier was destroyed by metamorphism. The isotopic homogeneity of metamorphosed bulk chondrites is consistent with extremely effective mixing of presolar grains from varied sources in the nebula. Osmium in the Os(i) carrier is likely from nucleosynthetic sites with a neutron density about two to four times as high as that of the average solar s-process Os.

引用

页码：1233 / 1236

页数：4

共 27 条

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