26Al in eucrite Piplia Kalan:: Plausible heat source and formation chronology

被引：138

作者：

Srinivasan, G ^{[1
]}

Goswami, JN ^{[1
]}

Bhandari, N ^{[1
]}

机构：

[1] Phys Res Lab, Ahmadabad 380009, Gujarat, India

来源：

SCIENCE | 1999年 / 284卷 / 5418期

关键词：

D O I：

10.1126/science.284.5418.1348

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：

Aluminum-magnesium isotopic analysis of plagioclase in the eucrite Piplia Kalan, with (27)A1/Mg-24 ratio between 2000 to 7000, reveals the presence of excess magnesium-26 resulting from in situ decay of the short-lived nuclide aluminum-26. This observation confirms aluminum-26 as a plausible heat source for melting and differentiation of the eucrite parent body in particular and for planetesimals in general. The inferred initial abundance of Al-26/Al-27 Of (7.5 +/- 0.9) x 10(-7) indicates that melting, differentiation, and crust formation in the parent body of Piplia Kalan was complete within 5 million years of the formation of the solar system.

引用

页码：1348 / 1350

页数：3

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