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Geomorphic constraints on active mountain growth by the lateralpropagation of fault-related folding: A case study on Yumu Shan, NETibet
Seong, Yeong Bae
2011
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
Volume41Issue:2Pages:184-194
AbstractThe mountain range of the Yumu Shan in NE Tibet is the topographic expression of actively growing fault-related folds developed in the hanging walls of a system of mostly northeast-vergent blind thrusts. Here we present a Tibetan example on the geomorphic response to lateral fold propagation using both qualitative analysis of the geomorphic characteristics of this region (e.g., wind and water gaps, drainage density, and along-strike topography of the range crest) and quantitative analysis based on cosmogenic Be-10 surface exposure dating and optically stimulated luminescence dating on the rates of uplift and lateral propagation of the anticline. The elevations of the past positions of successively deflected paleo-rivers show a systematic decrease toward the eastern tip of the anticline, in tandem with an eastward decrease in drainage density. Combining the age data obtained by cosmogenic Be-10 and OSL dating methods with the heights of abandoned terraces, we calculated average uplift and lateral propagation rates of similar to 378 mm/ka over the past similar to 185 ka and similar to 40 mm/yr over the past similar to 150 ka, respectively. Our single-site evaluation of the relation between tear faulting and channel deflection suggests that the tear faulting occurs along weakened bedrock already dissected by the former stream. This finding is inconsistent with the conventional hypothesis that the route of the deflecting stream is controlled by the orientation of the tear-faulting zone. Topographic vertical and lateral fold growth of the Yumu Shan were probably driven by the eastward propagation of a blind thrust since the late Neogene following the initial deposition of sediments in the Hexi Corridor, which were transported from the Qilian Shan. (C) 2011 Elsevier Ltd. All rights reserved. The mountain range of the Yumu Shan in NE Tibet is the topographic expression of actively growing fault-related folds developed in the hanging walls of a system of mostly northeast-vergent blind thrusts. Here we present a Tibetan example on the geomorphic response to lateral fold propagation using both qualitative analysis of the geomorphic characteristics of this region (e.g., wind and water gaps, drainage density, and along-strike topography of the range crest) and quantitative analysis based on cosmogenic Be-10 surface exposure dating and optically stimulated luminescence dating on the rates of uplift and lateral propagation of the anticline. The elevations of the past positions of successively deflected paleo-rivers show a systematic decrease toward the eastern tip of the anticline, in tandem with an eastward decrease in drainage density. Combining the age data obtained by cosmogenic Be-10 and OSL dating methods with the heights of abandoned terraces, we calculated average uplift and lateral propagation rates of similar to 378 mm/ka over the past similar to 185 ka and similar to 40 mm/yr over the past similar to 150 ka, respectively. Our single-site evaluation of the relation between tear faulting and channel deflection suggests that the tear faulting occurs along weakened bedrock already dissected by the former stream. This finding is inconsistent with the conventional hypothesis that the route of the deflecting stream is controlled by the orientation of the tear-faulting zone. Topographic vertical and lateral fold growth of the Yumu Shan were probably driven by the eastward propagation of a blind thrust since the late Neogene following the initial deposition of sediments in the Hexi Corridor, which were transported from the Qilian Shan. (C) 2011 Elsevier Ltd. All rights reserved.
KeywordActive Tectonics Blind Thrust Lateral Fold Propagation Channel
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/1873
Collection青海盐湖研究所知识仓储
Recommended Citation
GB/T 7714
Seong, Yeong Bae. Geomorphic constraints on active mountain growth by the lateralpropagation of fault-related folding: A case study on Yumu Shan, NETibet[J]. JOURNAL OF ASIAN EARTH SCIENCES,2011,41(2):184-194.
APA Seong, Yeong Bae.(2011).Geomorphic constraints on active mountain growth by the lateralpropagation of fault-related folding: A case study on Yumu Shan, NETibet.JOURNAL OF ASIAN EARTH SCIENCES,41(2),184-194.
MLA Seong, Yeong Bae."Geomorphic constraints on active mountain growth by the lateralpropagation of fault-related folding: A case study on Yumu Shan, NETibet".JOURNAL OF ASIAN EARTH SCIENCES 41.2(2011):184-194.
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