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THERMAL HISTORY STUDY IN THE WEST OF THE ORDOS BASIN USING APATITE FISSION TRACK ANALYSIS

GAO Feng, WANG Yue-jun, LIU Shun-sheng, HU Bao-qing(Changsha Institute of Geotectonics,Academia Sinica,Changsha 410013,China)  
For apatite has thermal sensitivity between 60 ℃to 150 ℃in geological time,the method of apatite fission track analysis not only is a main way to study the thermal history of sedimentary basins and tectonic movement,but also has important practical meaning in oil/gas exploration guide.Based on collected specimen of the Ordos basin,this paper applies the method of apatite fission track analysis to determine the age, and gets believable AFTA age data.In combining with former AFTA,TL and paleogeothermal gradient′s data,the thermal history of the Ordos basin,especially of the western area of the basin is discussed.The results show that the basin has experienced four thermal events at least since the early Mesozoic whose peak age is 170 Ma,130 Ma,75 Ma and 17 Ma respectively.
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