Data Repository for
Talas-Fergana Fault Cenozoic timing of deformation and its relation to Pamir indentation

Bande, Sobel, Mikolaichuk and Torres Acosta.

Supplemental data for apatite fission track methodology

Supplementary text
Apatite fission track methodology

Tables
Table DR1. Full AFT Data

APATITE FISSION TRACK METHODOLOGY
Apatite fission track (AFT) analysis was performed on 10 new samples. Conventional mineral separation techniques were used as described in Sobel and Strecker (2003). Apatite grains were etched in 5.5 mol Nitric acid for 20 seconds at 21˚C.  Samples were analyzed with a Leica DMRM microscope with drawing tube located above a digitizing tablet and a Kinetek computer-controlled stage driven by the FTStage program (Dumitru, 1993).  Analysis was performed with reflected and transmitted light at 1250X magnification.  Samples were irradiated at Oregon State University.  Following irradiation, the mica external detectors were etched with 21˚C, 40% hydrofluoric acid for 45 minutes.  The pooled age (central age) is reported for samples with P(χ2) greater than (less than) 5% as they pass (fail) the χ2 test.  
Kinetic properties where measured for every grain counted and/or containing measured horizontal confined fission track by making at least four Dpar measurements (Donelick et al., 2005), that were subsequently averaged and corrected following Sobel and Seward (2010). Most AFT Ages are based on 20 dated grains, and all of them are based on >17 grains. Age errors are presented as one sigma, calculated using the zeta calibration method (Hurford and Green, 1983). Statistics were calculated using the MacTrackX software. In 9 samples length of horizontal confined fission tracks were measured. When possible ~100 lenghts were measured. To increase the number of horizontal confined AFT lengths that could be measured, additional mounts were irradiated with heavy ions (Jonckheere et al., 2007).