Abstract/Details

Millennial slip -rates along the eastern Kunlun fault and rapid evolution of channel morphology in the yellow river headwaters, northeastern Tibet, China


2009 2009

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Abstract (summary)

A mechanical description of the interplay between ongoing crustal deformation and topographic evolution within the Tibetan Plateau remains outstanding, and thus our ability to describe the mechanisms responsible for the creation of this and other continental plateaus is limited. In this work, we employ a multidisciplinary approach to investigate the Quaternary record of active tectonism and coeval topographic evolution in the northeastern Tibetan Plateau. Fluvial channel topographic data paired with geochronologically calibrated measures of erosion rate reveal a headward migrating wave of dramatically accelerated incision rates in the headwaters of the Yellow River, which drains a large portion of northeastern Tibet. This transient increase in incision is likely driven by downstream base-level changes along the plateau margin and is superimposed onto a broad region of higher erosion rates confined to the plateau itself, within the Anyemaqen Shan (mountains). The Kunlun fault, one of the major active strike-slip faults of Tibet, trends through the Anyemaqen Shan. Using a careful approach towards quantifying millennial slip-rates along this fault zone based on the age of offset landforms, we constrain the Pleistocene kinematics of the eastern portion of the Kunlun fault and link this deformation to tectonically-driven erosion in the Anyemaqen Shan. Consideration of the age and morphology of fluvial terraces offset by the fault both highlights uncertainties associated with slip-rate determinations and allow more confident quantification of the allowable range of slip-rates at sites that take advantage of these features. Several new slip-rate determinations from this study at select locations corroborate a small number of previous determinations to identify an eastward decreasing slip-rate gradient and termination of the Kunlun fault within the Anyemaqen Shan. Existing geodetic data reveals a similar pattern of eastward-decreasing distributed shear across the fault zone. The spatial coincidence of tectonically driven erosion in the Anyemaqen Shan with the slip-rate gradient and termination the Kunlun fault implies that the crust of the northeastern plateau has the ability to accumulate regionally distributed permanent strain. Therefore, traditional 'rigid-body' rotation type descriptions of Tibetan Plateau kinematics fail to describe deformation on the northeastern plateau.

Indexing (details)


Subject
Geology;
Hydrologic sciences;
Remote sensing
Classification
0372: Geology
0388: Hydrologic sciences
0799: Remote sensing
Identifier / keyword
Earth sciences; Crustal deformation; Erosion rate; Slip-rates; Topographic evolution
Title
Millennial slip -rates along the eastern Kunlun fault and rapid evolution of channel morphology in the yellow river headwaters, northeastern Tibet, China
Author
Harkins, Nathan W.
Number of pages
194
Publication year
2009
Degree date
2009
School code
0176
Source
DAI-B 70/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781109468854
Advisor
Kirby, Eric
University/institution
The Pennsylvania State University
University location
United States -- Pennsylvania
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3380912
ProQuest document ID
304988483
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304988483
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