Annealing of fission tracks in wide-range,

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Annealing of fission tracks in wide-range, radiation-damaged detrital zircon Garver, J.I. Department of Geology, Union College Zircon undergoes a crystalline-to-amorphous transition by radiation damage, which causes internal disorder and lowers retention and stability of fission tracks. Optical images of thin sections of highly damage Cambrian detrital zircon, NY State [1] ZFT Ages of detrital zircon from Cambrian strata (NY) range from ~300 Ma to over 2000 Ma. Samples with greater thermal maturity (east) also a young ZFT population at 460 Ma and ~270 Ma, which coincides thermal events of the Taconic and the Alleghanian orogeny. [2] Annealing of Radiation Damaged grains in heated basin strata. The time of last heating to c. 200°C can be well dated using ZFT reset ages from detrital zircon as demonstrated in the Hellenic forearc (Greece), and the Chugach Accretionary complex and flanking basins (Alaska). [3] Measurement of radiation damage by Raman Spectroscopy. Grain-to-grain variation in radiation damage can be used to explain over-dispersion of ZFT grain ages in reheated samples. Fission-track dating radiation-damaged zircon grains can be used to date the time rocks are heated to the upper bounds of the oil/gas window Raman Laser scattering on zircon mount