Journal article
Eocene to Miocene Out-of-Sequence Deformation in the Eastern Tibetan Plateau: Insights From Shortening Structures in the Sichuan Basin
Y Tian, BP Kohn, N Qiu, Y Yuan, S Hu, AJW Gleadow, P Zhang
Journal of Geophysical Research Solid Earth | AMER GEOPHYSICAL UNION | Published : 2018
DOI: 10.1002/2017JB015049
Abstract
A distinctive NNE trending belt of shortening structures dominates the topography and deformation of the eastern Sichuan Basin, ~300 km east of the Tibetan Plateau. Debate continues as to whether the structures resulted from Cenozoic eastward growth of the Tibetan Plateau. A low-temperature thermochronology (AFT and AHe) data set from four deep boreholes and adjacent outcrops intersecting a branch of the shortening structures indicates distinctive differential cooling at ~35–28 Ma across the structure, where stratigraphy has been offset vertically by ~0.8–1.3 km. This result forms the first quantitative evidence for the existence of a late Eocene-Oligocene phase of shortening in the eastern ..
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Awarded by Guangdong Province Introduction of Innovative R&D Team
Funding Acknowledgements
Funding for this research was provided by Chinese 1000 Young Talents Program, National Natural Science Foundation of China (NSFC) grant 41772211, U1701641 and the Guangdong Province Introduced Innovative R&D Team (2016ZT06N331). The University of Melbourne thermochronology laboratory receives infrastructure support from the Australian Research Council and the AuScope Program of NCRIS. The authors are grateful to Chuanqing Zhu, Ming Xu, Jianzhong Qin and Tenger for their field assistance, and to Abaz Alimanovic, Brent McInnes and Noreen Evans for technical assistance with (U-Th-Sm)/He dating. Constructive reviews by Bastian Wauschkuhn and Andrew Zuza clarified many points in this article. A more detailed discussion of the analytical methodology can be found in the supporting information (Farley et al., 1996; Galbraith, 2005; Gleadow et al., 2009; House et al., 2000; Jochum et al., 2011; Ketcham et al., 2007). The data for this paper are included in the manuscript and the associated supporting information.