Western Hunan-Hubei Fold Belt Exhumation Characteristics and Its Tectonic Implication in Mesozoic-Cenozoic:Evidence from Apatite Fission Track
Zou Yaoyao
Zhang Shulin
Shen Chuanbo
Zhang Xianping
Li Zhiqiang
Yang Chaoqun
Abstract：Reconstruction of the Mesozoic-Cenozoic exhumation history in western Hunan-Hubei fold belt and establishing its temporal and spatial evolution play important role in the research of intracontinental orogeny as well as the petroleum explora-tion in this area.Based on apatite fission track (AFT)analysis and time-temperature thermal history modeling results,this work quantitively constrains the exhumation rate and thickness of the western Hunan-Hubei fold belt.The AFT ages here range from 71 to 100 Ma.Integrating with the AFT ages from fold belt in the East Sichuan basin,all the data present a younger trend from southeast to northwest.The time-temperature thermal history since Mesozoic shows a "three-stages"feature with the turning period occurred at 115—90 Ma and 35—20 Ma.The three stages correspond well with the geological evidence and re-spectively indicate different deformations.The deformations are respectively orogeny during Late Jurassic-Early Cretaceous,ba-sin formation in Late Cretaceous and tectonic uplift since Cenozoic.Yanshannian event is the main cause of the deformation. The deformation occurred earlier in the southeast and later in the northwest and the exhumation also presented a pattern being stronger in the southeast and weaker in the northwest.All the recognization during this work provides strong evidences for the deformation and evolution process of the western Hunan-Hubei to East Sichuan fold belt.
Keywords：western Hunan-Hubei fold beltMesozoic-Cenozoicapatite fission trackthermal history modelingexhumation characteristicspetroleum geology
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 2007-2018 )