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Uplift rate of Adirondack anorthosite measured by fission-track analysis of apatite

¹ Department of Geology, Rensselaer Polytechnic Institute, Troy, New York 12181
² Department of Natural Sciences, York College, City University of New York, Jamaica, New York 11451

The uplift history of the Adirondack anorthosite has been clarified by analyzing apatite using the fission-track method. Ages ranged from 86 to 147 m.y. on samples collected over an elevation difference of 11,560 m in the anorthosite massif. An uplift rate of about 0.03 mm/yr is obtained for the 61-m.y. interval from 86 to 147 m.y. ago, on the basis of the correlation between fission-track age and elevation. The calculated value for the uplift rate during the past 86 m.y. is 0.05 mm/yr. A Mesozoic "hotspot epeirogeny" is not required to explain the uplift rates based on apatite fission-track data.