The Tectonic Evolution of the Central Anticline in Western Hubei of China during Mesozoic:Evidences from Apatite Fission Track
Li Peng;Hu Zhengxiang;He Renliang;Li Xiongwei;Wu Long;Zong Wei;Du Xiaofeng;Zhou Feng;Hubei Geological Survey;
The central anticline of the western Hubei is located in the tectonic zone of the Yangtze block and the central Sichuan(western Hubei)foreland basin,which possesses important advantages for the study of regional tectonic evolution.In this paper,according to the detailed field geological survey and evidences form apatite fission track simulation,five stages of tectonic activities have been identified:(1)tectonic uplift at 187.4 Ma-180.1 Ma that resulted in the parallel unconformity between the Jiuligang Formation and the Tongzhuyuan Formation.(2)tectonic subsidence and deposition of terrestrial sediments at180.1 Ma-115.6 Ma.(3)slowl tectonic uplift once again associated with land erosion during 115.6 Ma-78.8 Ma.(4)subsidence again and the deposition of Cretaceous Paomagang Formation during the period of 78.8 Ma-63.6 Ma.(5)followed by great uplift until a small subsidence at 2.6 Ma of the Quaternary.Based on the tectonic evolution and the application of balanced profile technology,the regional tectonic pattern of extrusion-stretching process was established.