Journal
GEOSCIENCE FRONTIERS
Volume 7, Issue 2, Pages 181-196Publisher
CHINA UNIV GEOSCIENCES
DOI: 10.1016/j.gsf.2015.11.007
Keywords
-
Categories
Funding
- 973 Program [2014CB440801]
- NSFC [41230207, 41302167]
- State Key Laboratory of Earthquake Dynamics [LED2013B03]
Ask authors/readers for more resources
The Hongyanjing inter-arc basin, is located at the central part of Beishan Orogenic College (BOC), Gansu Province, northwest China. Thick sequences of Permian sediments were strongly folded, forming extremely spectacular superposed folds. To better understand the thermal history of Hongyanjing inter-arc basin and to potentially constrain the timing of deformation, apatite fission track thermochronology method was applied on two superposed folds in the Hongyanjing Basin. Samples from the basin, yield central AFT ages ranging from similar to 206 to 118 Ma. AFT peak ages were largely consistent between samples and can divided into three groups: 245, 204-170 and 112-131 Ma. Subsequent thermal history modeling of the samples from the Hongyanjing Basin can be summarized as follows: (1) thermal reheating by sedimentary burial at similar to 260 to similar to 220 Ma; (2) major cooling from similar to 220 to similar to 180 Ma; (3) an episode of very slow subsequent cooling from similar to 180 to 65 Ma (similar to 80 degrees C) to present-day outcrop temperatures. Sediments in the Hongyanjing Basin were folded forming F-1 fold during the early to late Triassic (similar to 240-similar to 220 Ma), by regional stress, and at the time that the adjacent Xingxingxia shear zone started to become active. It is further suggested that the F-2 folding occurred at similar to 225-219 Ma. The deformation age of F-2 should be extended to 180 Ma based on our thermal history modeling for the Hongyanjing Basin, which show a rapid exhumation and cooling at the late Triassic to early Jurassic (similar to 220-similar to 180 Ma). In our interpretations, the F-1 folding is therefore thought to be related to the final closure of the Paleo-Asian Ocean, while the F-2 folding occurred at similar to 225-180 Ma associated with a major pulse of orogenesis in the BOC. (C) 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available