Post-Early Cretaceous Denudation History of the Northeastern Sichuan Basin: Constraints from Low-Temperature Thermochronology Profiles

详细信息   

• 责任者：Tian Yuntao (State Key Lab. of Lithosphere Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China） ; Zhu Chuanqing
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54（3）
• 关键词：热史 ; thermal history ; 热年代学 ; thermochronology ; 四川 ; Sichuan Province
• 页码：p.807-816
• 图表：5 illus., 61 refs.
• 分类号：0400
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

 Previously reported apatite fission track (AFT) data from surface samples of the northeastern Sichuan Basin yield apparent ages range between 60~80 Ma, which as is often the case, cannot be linked directly to any obvious geological events.  To address these issues, the authors acquired new borehole AFT and apatite (U-Th)/He (AHe) data, which when combined with previously reported AFT surface and borehole data, allows synthetic AFT and AHe age and AFT length profiles for the basin to be constructed, and improves thermal history modeling to be carried out.  The results suggest that the most likely post-Early Cretaceous cooling history for the basin is cooling at a rate of ~0.57 ℃/Ma between ~100 and 30 Ma, followed by a rate of ~1.67 ℃/Ma since ~30 Ma.