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

Srinivasan, G. ; Goswami, J. N. ; Bhandari, N. (1999) 26Al in eucrite Piplia Kalan: plausible heat source and formation chronology Science, 284 (5418). pp. 1348-1350. ISSN 0036-8075

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Official URL: http://www.sciencemag.org/cgi/content/abstract/284...

Related URL: http://dx.doi.org/10.1126/science.284.5418.1348

Abstract

Aluminum-magnesium isotopic analysis of plagioclase in the eucrite Piplia Kalan, with 27Al/24Mg 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 26Al/27Al of (7.5 ± 0.9) × 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.

Item Type:Article
Source:Copyright of this article belongs to American Association for the Advancement of Science.
ID Code:14497
Deposited On:12 Nov 2010 14:10
Last Modified:16 May 2016 23:29

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