Journal
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
Volume 81, Issue 12, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10064-022-02997-1
Keywords
Lacustrine sediments; River blocking; Wind transport; OSL dating
Funding
- National Natural Science Foundation of China [41941017, U1702241]
- National Key Research and Development Plan [2018YFC1505301]
Ask authors/readers for more resources
This study discovered a significant amount of lacustrine sediments in the Suwalong reach, indicating river-blocking events and the formation of stable dammed lakes. Analysis revealed high deposition rates and non-local sources of the sediments, suggesting active tectonic activities and wind transport as the main mechanisms for sedimentation in the area.
A large amount of lacustrine sediments was found in the Suwalong reach, which is located upstream of the Jinsha River at the southeastern margin of the Tibetan Plateau. The study area belongs to the alpine valleys, with arid and semiarid climate. The appearance of lacustrine sediments indicates that river-blocking events had occurred in this reach and formed stable dammed lakes. By optically stimulated luminescence (OSL) dating, the burial time of lacustrine sediments was analysed, and the time sequence of river blocking and dam breaking in this reach was obtained. According to the burial time and thickness of lacustrine sediments, the deposition rate of sediments was obtained, and the maximum deposition rate is 170.5 mm/a, indicating that the provenance was abundant during the formation of lacustrine sediments. The results of grain size and SEM analysis show that the lacustrine sediments were mainly transported into lakes by wind, and the results of major element analysis also indicate that lacustrine sediments did not come from local areas. Combined with the above experimental results, we come to the conclusion that during the river-blocking period, the tectonic activities in the Suwalong reach and its vicinity were very active, triggered numerous landslides and rockfalls, and produced abundant silt particles. These silt particles were transported into the dammed lake of the Suwalong reach by wind.
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