Comment on “Radiation History of Fossil Meteorites from Sweden” by V.A. Alexeev (2010), solar system research, 44, 311–319
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We dispute the claim by Alexeev (2010) that the numerous fossil meteorites found in mid-Ordovician sediments in southern Sweden can be explained by a single large meteorite shower some 470 million years ago, and—in particular—that the reported variable cosmic ray exposure ages derived from cosmogenic 21Ne in chromite grains extracted from the fossil meteorites actually reflect variable contributions of nucleogenic 21Ne instead.
KeywordsOrdovician Chromite Solar System Research Isochron Ordovician Limestone
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