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Yu S.,Chinese Academy of Geological Sciences | Yu S.,National Key Laboratory of Continental Structure and Dynamics | Chen W.,Chinese Academy of Geological Sciences | Chen W.,National Key Laboratory of Continental Structure and Dynamics | And 10 more authors.
Tectonophysics | Year: 2014

Placing spatial and temporal constraints on deformation, uplift and exhumation using thermochronology methods can shed light on Cenozoic orogenic evolution in the Kuqa foreland. New apatite (U-Th)/He and previously published apatite fission track thermochronology are combined with vitrinite reflectance data and modeling to compile a low temperature, multi-stage thermal history of tectonic uplift/thrust and exhumation. A rapid uplift and exhumation event originated in South Tianshan during the Eocene (~ 46. Ma), with systematic younging of mean apatite (U-Th)/He ages from north to south (from the margin towards the interior). Uplift and exhumation south edge of the Biyoulebaoguzi anticline in the northern monocline belt at ~ 36. Ma with more than 3400. m of stratum denuded. Subsequently, deformation and uplift south edge of the Biyoulebaoguzi anticline in the northern monocline belt at ~ 36. Ma with more than 3400. m of stratum denuded. Subsequently, deformation and uplift extended to the northern edge of Kelasu-Yiqikelike at ~ 10. Ma and then at ~ 6. Ma, the Kanyaken anticline formed and uplifted resulting in 3000-3700. m of overburden erosion. The data support sequential southward propagating deformation and uplift (inferred exhumation) in the north Kuqa Depression during the Cenozoic, probably as a result of the collision of India with Asia far to the south of the Tianshan. © 2014 Elsevier B.V. Source


Yu S.,Chinese Academy of Geological Sciences | Yu S.,National Key Laboratory of Continental Structure and Dynamics | Chen W.,Chinese Academy of Geological Sciences | Chen W.,National Key Laboratory of Continental Structure and Dynamics | And 9 more authors.
Chinese Journal of Geophysics (Acta Geophysica Sinica) | Year: 2014

The oil and gas resources in Kuqa foreland basin are rich, however, there is a lack of effective researches of the tectonic thermal history in the Mesozoic and Cenozoic period, which is important for oil and gas exploration. Based on the tested apatite and zircon He ages data from drilling well samples, the He closure temperature of borehole apatites from Kuqa basin is determined (about 89°C) by analyzing the relationship between apatite ages of (U-Th)/He and depth/temperature in profile. Mesozoic-Cenozoic thermal history of the well TZ2 will has been modeled by using the He ages and vitrinite reflectance (Ro) data. The modeling result shows that the forming time of Tuziluoke anticline started at 5 Ma, and it uplifted and eroded about 670 m in Cenozoic period with the average erosion rate of 0.133 mm/a. According to structural evolution analysis of Tuziluoke anticline, the time of gas-migrating fault activity and trap formation was determined, which demonstrated the time of gas accumulation in the Tuziluoke anticline was 5 Ma. The consistency of the times of the hydrocarbon generation and expulsion, fault activity and trap formation was key factor for gas accumulation in Tuziluoke anticline. Therefore, application of the (U-Th)/He technology to the tectono-thermal evolution of sedimentary basin has the important significance for oil and gas exploration in Kuqa basin. Source

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