 | | Journal (article/letter/editorial) | | Amsterdam - Printed in The Netherlands [1l 26AI IN IRON METEORITES AND THE CONSTANCY OF COSMIC RAY INTENSITY...received December 1, 1978 Cosmic-ray-produced 26A1 in iron meteorites has been measured by low-level -rT-coincidence...dpm/kg, are: Aroos 3.0 ± 1.0, Braunau 2.6 -+0.5. Kayakent 4.6 ± 1.5, N'Goureyma 4.4 ± 1.1, Okahandja 3.6...hand, a comparison of 26A1/21Ne exposure ages in iron meteorites with corresponding 4°K/41K exposure ages...On the other hand, 26A1 activities determined in iron meteorites show an unreasonably large scatter. Usually |  | | Book | | four groups: siderophile, those enriched in nickel-iron; chalcophile, those enriched in a sulfide melt;...containing silicates, troilite (FeS), and free nickel-iron, provided a readily available “fossilized”’ experiment...terrestrial mineralogy may be pointed out: nickel-iron is practically absent from terrestrial rocks; the...clinohypersthene. in meteorites are largely magnesium-iron silicates, whereas in the Earth’s crust the commonest...minerals are quartz and aluminosilicates; the common meteorite minerals are anhydrous, whereas hydrated minerals |
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