Changes

==Example of fission track length interpretation==

==Example of fission track length interpretation==

The length data in itself may not be adequate to evaluate the thermal history. For example, the figure below shows a unimodal distribution of relatively long (unannealed) fission tracks. These data would need to be combined with the fission track age determination to derive thermal history information. If the fission track age of this sample was older than the depositional age, the implication would be that the sample had never been exposed to temperature in the annealing zone and most likely never experienced temperatures greater than [[temperature::60-70°C]]. In contrast, if the fission track age was less than the depositional age, the sample would have been subjected to temperatures above [[temperature::110-120°C]], where all of the original tracks would have been annealed. The sample would then have been uplifted rapidly and all of the remaining tracks would have formed since the uplift to a temperature zone less than or equal to the [[temperature::60-70°C]]. The fission track age date would provide information on the timing of this rapid uplift event.

The length data in itself may not be adequate to evaluate the thermal history. For example, the figure below shows a unimodal distribution of relatively long (unannealed) fission tracks. These data would need to be combined with the fission track age determination to derive thermal history information. If the fission track age of this sample was older than the depositional age, the implication would be that the sample had never been exposed to temperature in the annealing zone and most likely never experienced temperatures greater than [[temperature::60°C]] to [[temperature::70°C]]. In contrast, if the fission track age was less than the depositional age, the sample would have been subjected to temperatures above [[temperature::110°C]] to [[temperature::120°C]], where all of the original tracks would have been annealed. The sample would then have been uplifted rapidly and all of the remaining tracks would have formed since the uplift to a temperature zone less than or equal to the [[temperature::60°C]] to [[temperature::70°C]]. The fission track age date would provide information on the timing of this rapid uplift event.

[[file:evaluating-source-rocks_fig6-13.png|thumb|{{figure number|6-13}}See text for explanation.]]

[[file:evaluating-source-rocks_fig6-13.png|thumb|{{figure number|6-13}}See text for explanation.]]