Al-26 and Fe-60 nuclides as heat source of ordinary chondrite parent bodies: Evaluation by U-Pb systematics

Details Al-26 and Fe-60 nuclides as heat source of ordinary chondrite parent bodies: Evaluation by U-Pb systematics Al-26 and Fe-60 nuclides as heat source of ordinary chondrite parent bodies: Evaluation by U-Pb systematics

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..495m&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 495-496

Computer Science

Aluminum Isotopes, Chondrites, Heat Sources, Iron Isotopes, Radioactive Decay, Inclusions, Mineralogy, Radioactive Age Determination, Solar Corona, Temperature Effects

Scientific paper

In order to evaluate if the Al-26 and Fe-60 nuclides have been a general heat source of the meteorite parent bodies, it is important to establish the in-situ decay of these nuclides in the various materials; evaluate how widely these nuclides were distributed in the solar nebula; and elucidate if the various thermal intensities recorded by the meteorites result from an inhomogeneous distribution of these nuclides in the solar nebula and/or from differences in the accretion times of their parent bodies. We illustrate the coupling between the systematics of these two short-lived nuclides and the U-Pb chronology in the case of chondrites. We quantify how the heating of equilibrated H chondrites by Al-26 and Fe-60 is compatible with the record of these nuclides in the Allende inclusions and with the U-Pb systematics in both materials. In order to define the amount of energy necessary to heat the H chondritic material, the heat capacity is calculated from its specific chemical composition and from the thermodynamical data of the minerals present in equilibrated chondrites. Assuming that the refractory inclusions in Allende record the Al and Fe isotopic compositions in the solar nebula at the time of their formation, the contribution of the Al-26 and Fe-60 decay to the heating of the H chondrite material is calculated as a function of its accretion time. The most radiogenic isotopic compositions of Pb extracted from Allende inclusions define an age of 4556-1/+2 m.y. Phosphates in H4 chondrites correspond to an age as old as 4562.7 +/- 0.6 m.y. If the 3-m.y. difference is interpreted as the time delay between the formation of the refractory material and the accretion of the H chondrite material, the energy released by simultaneous in-situ decay of Al-26 and Fe-56 accounts for metamorphism in H6 chondrites.

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