The Getafe rock: Fall, composition and cosmic ray records of an unusual ultrarefractory scoriaceous material
DOI:
https://doi.org/10.3989/revmetalm.1999.v35.i5.639Keywords:
Getafe rock, Fall, Composition, Cosmic ray records, Meteorite, Slag, Madrid, SpainAbstract
In 1994 a moving car and its driver, on a highway in southern Madrid (Getafe), were struck by a falling rock. Eighty-one additional fragments (total weight: 55.926 kg) were later recovered, which all pointed towards a meteorite fall. A study of the composition of this object revealed an ultrarefractory material displaying a most unusual chemical make-up which differs from any known meteorite class, and for some elements and minerals approaches the composition of CAI (Ca-Al-rich inclusions in chondrites). A study of some cosmic-ray-produced stable and radioactive nuclides indicates: a) space and terrestrial exposure ages which do not exceed 1,000 and 520,000 years, respectively; b) the presence of a small 22Ne excess (1,100°C fraction), which suggests either a nucleogenic contribution from the 19F(α,n)22Ne reaction or a trapped Ne signature distinct from atmospheric Ne, and c) the existence of minor variations in the 38Ar/36Ar ratios also indicating a nucleogenic component or fractionation effects. 14C data are consistent with "modern" carbon originated in the period 1955-1958 and not earlier or more recently. The possibility that the Getafe rock could have a man-made origin (i.e. ceramic and refractory tiles, industrial slag) is also considered.
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Published
1999-10-30
How to Cite
Martínez Frías, J., Weigel, A., Marti, K., Boyd, T., Wilson, G. H., & Jull, T. (1999). The Getafe rock: Fall, composition and cosmic ray records of an unusual ultrarefractory scoriaceous material. Revista De Metalurgia, 35(5), 308–314. https://doi.org/10.3989/revmetalm.1999.v35.i5.639
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