Geomorphometric features of the alluvial fans around the Chaka-Qinghai Lake in the northeastern Tibetan Plateau

Abstract

This article aims to study the geomorpometric features of alluvial fans since they act as a small-scale geomorphic unit response to tectonics and climate changes around the Chaka-Qinghai Lake area in the northeastern Tibetan Plateau. We quantitatively extracted geomorphic parameters, such as the surface area and slope of alluvial fans adjacent to the Qinghai Nan Shan and Ela Shan. Alluvial fans in the Chaka Lake partition area, south of the Qinghai Nan Shan, are featured by a small area and short length, but the largest slope. Geomorphic parameters of the alluvial fans in Ela Shan area are intermediate in size, and the alluvial fans in the Qinghai Lake partition area north of Qinghai Nan Shan have the gentlest slope. Together with the regional faulting activity analysis, we suggest that the alluvial fans with the high slopes in the south of Qinghai Nan Shan are mainly controlled by the reverse faulting along the Qinghai Nan Shan faults, and the strike-slip movement of the Ela Shan fault zone plays a weak role. In contrast, due to the lack of active faults, the alluvial fans near the Qinghai Lake area north of the Qinghai Nan Shan only respond to regional erosion, transportation, and deposition processes, thereby forming relatively gentle geomorphic units.

Keywords

northeastern Tibetan Plateau / Chaka-Qinghai Lake / alluvial fan / geomorphometric feature / geomorphic process

References

[1] Allen P A, Hovius N. Sediment Supply from Landslide-Dominated Catchments: Implications for Basin-Margin Fans. Basin Research, 1998, 10(1): 19-35.

[2] Ashworth P. Alluvial Fans: Geomorphology, Sedimentology, Dynamics. Area, 2006, 38(2): 225-226.

[3] Bahrami S. Tectonic Controls on the Morphometry of Alluvial Fans around Danehkhoshk Anticline, Zagros, Iran. Geomorphology, 2013, 180–181: 217-230.

[4] Brocklehurst S H. Tectonics and Geomorphology. Progress in Physical Geography, 2010, 34(3): 357-383.

[5] Bull W B. Geomorphology of Segmented Alluvial Fans in Western Fresno County, California. US Geological Survey, Professional Papers, 1964, 352: 89-129.

[6] Calvache M L, Viseras C, Fernandez J. Controls on Fan Development-Evidence from Fan Morphometry and Sedimentology, Sierra Nevada, SE Spain. Geomorphology, 1997, 21(1): 69-84.

[7] Chang H, An Z S, Wu F. Major Element Records from the Qinghai Lake Basin-Gonghe Basin Sediments Indicating the Nashan (Qinghai) Uplift Event. Quaternary Sciences, 2008, 28(5): 822-830.

[8] Chang H, Jin Z, An Z S. Sedimentary Evidences of the Uplift of the Qinghai Nanshan (the Mountains South to the Qinghai Lake) and Its Implication for Structural Evolution of the Lake Qinghai-Gonghe Basin. Geological Review, 2009, 55(1): 49-57.

[9] Clark M K. Continental Collision Slowing due to Viscous Mantle Lithosphere Rather than Topography. Nature, 2012, 483(7387): 74-77.

[10] Clark M K, Royden L H, Whipple K X, . Use of Regional, Relict Landscape to Measure Vertical Deformation of the Eastern Tibetan Plateau. Journal of Geophysical Research, 2006, 111 F3 F03002

[11] Craddock W, Kirby E, Zhang H P. Late Miocene-Pliocene Range Growth in the Interior of the Northeastern Tibetan Plateau. Lithosphere, 2011, 3(6): 420-438.

[12] Dade W B, Verdeyen M E. Tectonic and Climatic Controls of Alluvial-Fan Size and Source-Catchment Relief. Journal of the Geological Society, 2007, 164: 353-358.

[13] de Scally F A, Owens I F. Morphometric Controls and Geomorphic Responses on Fans in the Southern Alps, New Zealand. Earth Surface Processes and Landforms, 2004, 29(3): 311-322.

[14] Fielding E, Isacks B, Barazangi M, . How Flat is Tibet?. Geology, 1994, 22(2): 163-167.

[15] Giaconia F, Booth-Rea G, Martinez-Martinez J M, . Geomorphic Evidence of Active Tectonics in the Sierra Alhamilla (Eastern Betics, SE Spain). Geomorphology, 2012, 145–146: 90-106.

[16] Kirby E, Whipple K. Quantifying Differential Rock-Uplift Rates via Stream Profile Analysis. Geology, 2001, 29(5): 415-418.

[17] Kirby E, Whipple K X, Tang W Q, . Distribution of Active Rock Uplift along the Eastern Margin of the Tibetan Plateau: Inferences from Bedrock Channel Longitudinal Profiles. Journal of Geophysical Research, 2003, 108 B4 2217

[18] Kumar R, Suresh N, Sangode S J, . Evolution of the Quaternary Alluvial Fan System in the Himalayan Foreland Basin: Implications for Tectonic and Climatic Decoupling. Quaternary International, 2007, 159(1): 6-20.

[19] Métivier F, Gaudemer Y, Tapponnier P, . Northeastward Growth of the Tibet Plateau Deduced from Balanced Reconstruction of Two Depositional Areas: The Qaidam and Hexi Corridor Basins, China. Tectonics, 1998, 17(6): 823-842.

[20] Meyer B, Tapponnier P, Bourjot L, . Crustal Thickening in Gansu-Qinghai, Lithospheric Mantle Subduction, and Oblique, Strike-Slip Controlled Growth of the Tibet Plateau. Geophysical Journal International, 1998, 135(1): 1-47.

[21] Molnar P, Stock J M. Slowing of India’s Convergence with Eurasia since 20 Ma and Its Implications for Tibetan Mantle Dynamics. Tectonics, 2009, 28 3 TC3001

[22] Ramsey L A, Walker R T, Jackson J. Geomorphic Constraints on the Active Tectonics of Southern Taiwan. Geophysical Journal International, 2007, 170(3): 1357-1372.

[23] Singh V, Tandon S K. Evidence and Consequences of Tilting of Two Alluvial Fans in the Pinjaur Dun, Northwestern Himalayan Foothills. Quaternary International, 2007, 159(1): 21-31.

[24] Sinha S, Suresh N, Kumar R, . Sedimentologic and Geomorphic Studies on the Quaternary Alluvial Fan and Terrace Deposits along the Ganga Exit. Quaternary International, 2010, 227(2): 87-103.

[25] Tapponnier P, Xu Z Q, Roger F, . Oblique Stepwise Rise and Growth of the Tibet Plateau. Science, 2001, 294(5547): 1671-1677.

[26] van der Woerd J. Kinematic Coupling between Active Strike-Slip and Thrust Faults in Northeast Tibet, 1998 Paris: Universite Paris

[27] Wang E, Burchfiel B C. Late Cenozoic Right-Lateral Movement along the Wenquan Fault and Associated Deformation: Implications for the Kinematic History of the Qaidam Basin, Northeastern Tibetan Plateau. International Geology Review, 2004, 46(10): 861-879.

[28] Whipple K X. Bedrock Rivers and the Geomorphology of Active Orogens. Annual Review of Earth and Planetary Sciences, 2004, 32: 151-185.

[29] Whittaker A C. How do Landscapes Record Tectonics and Climate?. Lithosphere, 2012, 4(2): 160-164.

[30] Willgoose G, Bras R L, Rodriguez-Iturbe I. A Physical Explanation of an Observed Link Area-Slope Relationship. Water Resour. Res., 1991, 27(7): 1697-1702.

[31] Yin A, Harrison T M. Geologic Evolution of the Himalayan-Tibetan Orogen. Annual Review of Earth and Planetary Sciences, 2000, 28(1): 211-280.

[32] Yuan D Y, Champagnac J D, Ge W P, . Late Quaternary Right-Lateral Slip Rates of Faults Adjacent to the Lake Qinghai, Northeastern Margin of the Tibetan Plateau. Geological Society of America Bulletin, 2011, 123(9–10): 2016-2030.

[33] Zhang H P, Craddock W H, Lease R O, . Magnetostratigraphy of the Neogene Chaka Basin and Its Implications for Mountain Building Processes in the North-Eastern Tibetan Plateau. Basin Research, 2012, 24(1): 31-50.