Age and intensity of thermal events by fission track analysis: The Ries impact crater |
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| Authors: | Donald S Miller Günther A Wagner |
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| Institution: | Department of Geology, Rensselaer Polytechnic Institute, Troy, NY 12181 U.S.A.;Max-Planck-Institut für Kernphysik, 69 Heidelberg Federal Republic of Germany |
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| Abstract: | A thermal event reduces the number of previously registered fission tracks in a mineral dependent upon the track retention properties of the individual mineral. Apatite, sphene and zircon have retention properties over a wide range of temperatures (from 100° to 550°C); apatite data reveal information at lowest temperatures while sphene and zircon data are useful for higher temperatures.Thermal events within this temperature range of 100°C to about 550°C are suitable for study with this technique. The age of the event is determined from samples in which the fission tracks are completely erased, while minerals containing partially removed (erased) tracks provide information on the temperatures occurring during the thermal event.As a test case, the analysis of the temperatures developed by the meteorite impact which produced the Ries crater at 14.7 m.y. ago is presented. |
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