期刊
QUATERNARY RESEARCH
卷 82, 期 2, 页码 430-440出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1016/j.yqres.2014.06.001
关键词
Glacier-dammed lake; Yarlung-Tsangpo; Zelunglung Glacier; Tibet
资金
- Institute of Geology
- China Earthquake Administration
- Seismological Bureau of Tibet Autonomous Region
- National Science Council Taiwan [96-2116-M-002-001-MY3]
We present a reconstructed lithologic column compiled from a series of lacustrine outcrops along a tributary of the Nyang River, a major tributary of the Yarlung-Tsangpo in southeast Tibet. The deposits were preserved between terraces at altitudes of 2950-3100 m asl. The stratigraphic record features at least two sets of coarsening-upward sequences depicting episodic aggradation and progradation of a glacially dammed lake related delta. Recognized facies changes illustrate the evolution cycles of depositional environments from pro-delta, delta front, to delta plain. Radiocarbon and optically stimulated luminescence dates reveal an aging-downward trend in stratigraphic order and provide an approximate timeline for the formation of glacially dammed lakes in late Pleistocene. This result reflects that the Zelunglung Glacier had progressively advanced to block the Yarlung-Tsangpo river and the dam materials had stepwise stacked up to an altitude of 3095 m asl during Marine Oxygen Isotope Stages 4 to 2. (C) 2014 University of Washington. Published by Elsevier Inc. All rights reserved.
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