Nuclear track records in the Abee enstatite chondrite

Goswami, J. N. (1983) Nuclear track records in the Abee enstatite chondrite Earth and Planetary Science Letters, 62 (1). pp. 159-164. ISSN 0012-821X

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Nuclear track records in fourteen samples taken from different locations of a cut-slab of the Abee enstatite chondrite were studied to determine its pre-atmospheric mass and to delineate its cosmic ray exposure history. The measured track densities in different samples range from 104 to 106 cm-2. No significant variations in track densities for individual grains from a given location was found. Excess tracks of fissionogenic origin were found near the grain edges, and across cleavage planes in eight enstatite grains out of ~300 grains analysed in the present work. The compaction age of the meteorite could not be obtained due to the absence of suitable oldhamite-enstatite contacts in thick sections. The track data rule out pre-irradiation of any of the analysed samples with shielding less than a few tens of centimeter. The iso-track-density contours on the plane of the slab imply an asymmetric ablation of the Abee chondrite during its atmospheric transit. A spherical body having a radius of ~30 cm closely approximates the pre-atmospheric shape and size of the Abee meteorite. The mass loss during ablation was ~70% of the original mass.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:14542
Deposited On:12 Nov 2010 14:05
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