Heat dating

Chemical etching of polished internal surfaces of these minerals reveals spontaneous fission tracks, and the track density can be determined.

Because etched tracks are relatively large (in the range 1 to 15 micrometres), counting can be done by optical microscopy, although other imaging techniques are used.

Unlike other isotopic dating methods, the "daughter" in fission track dating is an effect in the crystal rather than a daughter isotope.

Uranium-238 undergoes spontaneous fission decay at a known rate, and it is the only isotope with a decay rate that is relevant to the significant production of natural fission tracks; other isotopes have fission decay rates too slow to be of consequence.

Fission-track dating is a relatively simple method of radiometric dating that has made a significant impact on understanding the thermal history of continental crust, the timing of volcanic events, and the source and age of different archeological artifacts.

The method involves using the number of fission events produced from the spontaneous decay of uranium-238 in common accessory minerals to date the time of rock cooling below closure temperature.

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and these are concentrated in the area of a major domal uplift centred on Kangerdlugssuaq.

Fission track ages have been measured for 12 sphenes, 18 zircons and 25 apatites separated largely from Lower Tertiary magmatic rocks of East Greenland, with a few examples from Caledonian rocks.

The sphene and zircon ages of Caledonian rocks agree with other radiometric ages but apatite is strongly discordant indicating that these rocks cooled very slowly over a 200 m.y. It was not until the Permian/Lower Jurassic that they finally cooled below 100 ° C, possibly as a consequence of uplift and erosion at this time in connection with extensive rifting.

And that’s what some of my co-workers were even saying, so that was tough.

So they would tell me one thing in the locker room and then go out, and all of a sudden something would get cut, or you’re no longer doing a match with this person. ’ And Steph would say, ‘So and so complained, they don’t like this storyline, they don’t like this.’ So it was always hard for me to enjoy those moments when there was so much stress on the outside taking place what felt like 100% of the time.

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