Measurement of terrestrial age of Antarctic meteorites by thermoluminescence technique

• Main Authors: Ninagawa, Kiyotaka, Miono, Shigeyoshi, Yoshida, Masaru, Takaoka, Nobuo
• Language: English
• Published: 1983
• Subjects: Antarctic; The Antarctic; Antarc*; Antarctica; Ice Sheet; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/record/1564/files/KJ00000012197.pdf

P(論文) The thermoluminescence (TL) of Antarctic meteorites, ALH-77256,90 (Di), ALH-77294,81,82 (H5), ALH-765,75,85 (Eu), ALH-768,83 (H6) and ALH-77272,83,84 (L6) is measured. The depth dependence of the TL for ALH-77294,81,ALH-765,75 and ALH-768,83,which have fusion crusts, is also measured. The heating of the surface material (0-1.5mm depth) during atmospheric passage is estimated from the fading of the high temperature TL. It is revealed that this atmospheric heating entirely removes the low temperature TL from the surface of a meteorite and the present low temperature TL glow of the surface material is produced by subsequent terrestrial radiation in Antarctica. The terrestrial ages of these meteorites are estimated from the TL of the surface material with an assumption about the Antarctic storage conditions (stored on the surface or buried under the ice sheet). departmental bulletin paper