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    Rapid Kimberlite Ascent and the Significance of Ar-Ar Ages in Xenolith Phlogopites (2000)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 289 (5479). pp. 609-611.
    Details
    Publication Date: 2015-11-24
    Description: Kimberlite eruptions bring exotic rock fragments and minerals, including diamonds, from deep within the mantle up to the surface. Such fragments are rapidly absorbed into the kimberlite magma so their appearance at the surface implies rapid transport from depth. High spatial resolution Ar-Ar age data on phlogopite grains in xenoliths from Malaita in the Solomon Islands, southwest Pacific, and Elovy Island in the Kola Peninsula, Russia, indicate transport times of hours to days depending upon the magma temperature. In addition, the data show that the phlogopite grains preserve Ar-Ar ages recorded at high temperature in the mantle, 700°C above the conventional closure temperature.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Origin and Migration of the Alpine Iceman (2003)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 302 (5646). pp. 862-866.
    Details
    Publication Date: 2015-11-24
    Description: The Alpine Iceman provides a unique window into the Neolithic-Copper Age of Europe. We compared the radiogenic (strontium and lead) and stable (oxygen and carbon) isotope composition of the Iceman's teeth and bones, as well as 40Ar/39Ar mica ages from his intestine, to local geology and hydrology, and we inferred his habitat and range from childhood to adult life. The Iceman's origin can be restricted to a few valleys within ∼60 kilometers south(east) of the discovery site. His migration during adulthood is indicated by contrasting isotopic compositions of enamel, bones, and intestinal content. This demonstrates that the Alpine valleys of central Europe were permanently inhabited during the terminal Neolithic.
    Type: Article , PeerReviewed
    Format: text
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