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Geomorphological consequences of weak lower continental crust, and its significance for studies of uplift, landscape evolution, and the interpretation of river terrace sequences

Published online by Cambridge University Press:  01 April 2016

R. Westaway
R. Westaway*
Affiliation:
16 Neville Square, Durham DH1 3PY, England

Abstract

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Effects of flow in the lower continental crust have often been ignored in the geomorphological literature on the growth of topography during the Quaternary. However, the ability of the lower crust to flow in response to horizontal pressure gradients, caused by lateral variations in the depth of the base of the brittle upper crust, results in two mechanisms for the growth of topography, which can occur either separately or in combination. First, an increase in the rate of erosion in a region will result in a progressive reduction in the depth of the base of the brittle layer, which will drive inflow of lower crust to beneath the region, which will increase the crustal thickness and thus the altitude of the Earth’s surface. It is important to note that this mechanism can increase the mean altitude of the Earth’s surface, not just the altitude of summits formed of erosion-resistant rock or other features that are not eroding, which will rise faster than the surrounding eroding landscape. Second, repeated cyclic surface loading by ice sheets or fluctuations in global sea-level will cause net flow from areas of relatively cool lower crust to beneath areas of warmer crust. This process will thus usually result in net flow of lower crust from beneath offshore areas to beneath land areas, thinning the crust and increasing the bathymetry offshore but adding to the crustal thickness and so uplifting the land surface onshore. Although these two processes have different mechanisms, the time scale over which both operate is governed by the time required for heat diffusion, resulting from lower-crustal flow (which is concentrated near the Moho), to affect the position of the base of the brittle layer. As a result, the uplift responses for both processes can be very similar. This means that to resolve the physical cause of uplift at any locality requires knowledge of the regional conditions before uplift began, not just evidence (such as river terrace sequences) from during the course of uplift. This study illustrates the complexities and practical difficulties that can result from these issues, using case studies of localities that have been modelled in detail. It also points out that, although the ability to carry out quantitative calculations involving lower-crustal flow is new, the idea that such flow provides a general mechanism for the growdi of topography was first suggested in the early 19th century, but was later abandoned - apparently mistakenly. An early Middle Pleistocene increase in uplift rates is widely-recognised from river terrace records, and typically marks a transition from broad valleys in areas of low relief to narrower, more deeply incised gorges. It is suggested that the isostatic response to cyclic surface loading, caused by the growth and decay of continental ice sheets and the associated sea-level fluctuations, is the main cause of this change, following the increase in scale of ice sheet development from oxygen isotope stage 22 (~0.9 Ma) onwards. The less well resolved earlier increase in uplift rates, evident in some river terrace records at ~3 Ma, is more likely to result from the isostatic response to increased rates of erosion linked to the contemporaneous deterioration in climate.

Keywords

Quaternaryriver terracesgeomorphologyuplifterosion
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 81 , Special Issue 3-4: Fluvial Archive Group, FLAG , December 2002 , pp. 283 - 303
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2002

References

Arger, J., Mitchell, J. & Westaway, R., 2000. Neogene and Quaternary volcanism of south-eastern Turkey. In: Bozkurt, E., Winchester, J.A. & Piper, J.D.A. (eds): Tectonics and Magmatism of Turkey and the Surrounding Area. Geological Society of London Special Publication 173: 459–487.Google Scholar
Armijo, R., Meyer, B., King, G.C.P., Rigo, A. & Papanastassiou, D., 1996. Quaternary evolution of the Corinth Rift and its implications for the Late Cenozoic evolution of the Aegean. Geophysical Journal International 126: 11–53.CrossRefGoogle Scholar
Bond, G., 1978. Evidence for Late Tertiary uplift of Africa relative to North America, South America, Australia and Europe. Journal of Geology 86: 47–65.CrossRefGoogle Scholar
Bridgland, D.R., 1994. The Quaternary of the Thames. Nature Conservancy Council (London, England): 441 pp.CrossRefGoogle Scholar
Bridgland, D.R. & Allen, P., 1996. A revised model for terrace formation and its significance for the early Middle Pleistocene terrace aggradations of north-east Essex, England. In: Turner, C. (ed.): The early Middle Pleistocene in Europe. Balkema (Rotterdam): 121–134.Google Scholar
Bridgland, D.R. & Schreve, D.C., 2001. River terrace formation in synchrony with long-term climatic fluctuation: examples from southern Britain. In: Maddy, D., Macklin, M. & Woodward, J. (eds): River Basin Sediment Systems: Archives of Environmental Change. Balkema (Abingdon, England): 229–248.Google Scholar
Buck, W.R., 1988. Flexural rotation of normal faults. Tectonics 7: 959–973.CrossRefGoogle Scholar
Cheremisinoff, N.P., 1993. An Introduction to Polymer Rheology and Processing, CRC Press (Ann Arbor, Michigan).Google Scholar
Cross, M.M., 1966. Rheology of non-newtonian fluids: A new flow equation for pseudoplastic systems. Journal of Colloid Science 20:417–437.CrossRefGoogle Scholar
Damon, P.E., 1971. The relationship between Late Cenozoic volcanism and tectonism and orogenic-epeiorogenic periodicity. In: Turekian, K.E. (ed.), The Late Cenozoic Glacial Ages. Yale University Press (New Haven, Connecticut): 15–35.Google Scholar
De Sitter, L.U., 1952. Pliocene uplift ofTertiary mountain chains. American Journal of Science 250: 297–307.CrossRefGoogle Scholar
England, P. & Molnar, P., 1990. Surface uplift, uplift of rocks, and exhumation of rocks. Geology 18: 1173–1177.2.3.CO;2>CrossRefGoogle Scholar
Evans, C.D.R., 1990. The geology of the western English Channel and its western approaches. British Geological Survey UK Offshore Regional Report. Her Majesty’s Stationary Office (London, England): 93 pp.Google Scholar
Eyles, N., 1996. Passive margin uplift around the North Atlantic region and its role in northern hemisphere late Cenozoic glaciation. Geology 24: 103–106.2.3.CO;2>CrossRefGoogle Scholar
Flint, R.F., 1957. Glacial and Pleistocene Geology. John Wiley & Sons (London, England): 553 pp.Google Scholar
Geyl, W.F., 1960. Geophysical speculations on the origin of stepped erosion surfaces. Journal of Geology 68: 154–176.CrossRefGoogle Scholar
Gilchrist, A.R., Kooi, H. & Beaumont, C. 1994. Post-Gondwana evolution of southwestern Africa: Implications for the controls on landscape development from observations and numerical experiments. Journal of Geophysical Research 99: 12,211–12,228.CrossRefGoogle Scholar
Gilchrist, A.R. & Summerfield, M.A., 1990. Differential denudation and flexural isostasy in the formation of rifted-margin up-warps. Nature 346: 739–742.CrossRefGoogle Scholar
Gilchrist, A.R., Summerfield, M.A. & Cockburn, H.A.P., 1991. Landscape dissection, isostatic uplift, and the morphologic development of orogens. Geology 22: 963–966.2.3.CO;2>CrossRefGoogle Scholar
Greene, M.T., 1982. Geology in the Nineteenth Century: Changing Views of a Changing World. Cornell University Press (Ithaca, New York):324pp.Google Scholar
Haggart, B.A., 1995. A re-examination of some data relating to Holocene sea-level changes in the Thames estuary. In: Bridgland, D.R., Allen, P. & Haggart, B.A. (eds): The Quaternary of the Lower Reaches of the Thames, Field Guide. Quaternary Research Association (Durham, England): 329–337.Google Scholar
Herschel, J.F.W., 1837. Letter to Lyell. In: Babbage, C. (ed.): On the Action of Existing Causes in Producing Elevations and Subsidences in Portions of the Earth’s Crust. The Ninth Bridgewater Treatise, Appendix G. John Murray (London, England): 202–217.Google Scholar
Holmes, A., 1965. Principles of Physical Geology, 2nd edition, Nelson (London, England): 1288 pp.Google Scholar
Jones, D.K.C., 1999. Evolving models of the Tertiary evolutionary geomorphology of southern England, with special reference to the Chalklands. In: Smith, B.J., Whalley, W.B. & Warke, P.A. (eds): Uplift, Erosion, and Stability: Perspectives on Long-term Landscape Development. Geological Society of London Special Publication 162: 1–23.Google Scholar
Kaufman, P.S. & Royden, L.H., 1994. Lower crustal flow in an ex-tensional setting: Constraints from the Halloran Hills region, eastern Mojave Desert, California. Journal of Geophysical Research 99: 15723–15739.CrossRefGoogle Scholar
Keraudren, B., Falguères, C., Bahain, J.-J., Sorel, D. & Yokoyama, Y. 1995. New radiometrie dating from the marine terraces of Corinthia, Greece. Comptes Rendus de l’Académie des Sciences de Paris, Series Па 320: 483–489 (in French with English summary).Google Scholar
Keraudren, B. & Sorel, D., 1987. The terraces of Corinth (Greece) - a detailed record of eustatic sea-level variations during the last 500,000 years. Marine Geology 77: 99–107.CrossRefGoogle Scholar
King, L.C., 1955. Pediplanation and isostacy: An example from South Africa. Quarterly Journal of the Geological Society of London 111:353–359.CrossRefGoogle Scholar
King, G.C.P. & Ellis, M.A., 1990. The origin of large local uplift in extensional regions. Nature 348: 689–693.CrossRefGoogle Scholar
King, G.C.P., Stein, R.S. & Rundle, J.B., 1988. The growth of geological structures by repeated earthquakes, 1. Conceptual framework. Journal of Geophysical Research 93: 13307–13318.CrossRefGoogle Scholar
Klein, A., Jacoby, W. & Smilde, P., 1997. Mining-induced crustal deformation in northwest Germany: modelling the rheological structure of the lithosphère. Earth and Planetary Science Letters 147: 107–123.CrossRefGoogle Scholar
Kooi, H. & Beaumont, C. 1994. Escarpment evolution on high-elevation rifted margins: Insights derived from a surface processes model that combines diffusion, advection, and reaction. Journal of Geophysical Research 99: 12191–12209.CrossRefGoogle Scholar
Kooi, H., Hettema, M. & Cloetingh, S., 1991. Lithospheric dynamics and the rapid Pliocene-Quaternary subsidence phase in the southern North Sea basin. Tectonophysics 192: 245–259.CrossRefGoogle Scholar
Kukla, G.J., 1975. Loess stratigraphy of central Europe. In: Butzer, K.W. & Isaac, G.L. (eds): After the Australopithecines (Mouton, The Hague): 99–188.CrossRefGoogle Scholar
Kukla, G.J., 1978. The classical European glacial stages: correlation with deep-sea sediments. Transactions of the Nebraska Academy of Sciences 6: 57–93.Google Scholar
Kusznir, N.J. & Park, R.G., 1984. Continental lithosphère strength: the critical role of lower crustal deformation. In: Dawson, J.B., Carswell, D.A. & Wedepohl, K.H. (eds): The Nature of the Lower Continental Crust. Geological Society of London Special Publication 24: 79–93.CrossRefGoogle Scholar
Kusznir, N.J., Marsden, G. & Egan, S., 1991. A flexural-cantilever simple-shear / pure-shear model of continental extension: application to the Jeanne d’Arc basin, Grand Banks, and Viking Graben, North Sea. In: Roberts, A.M., Yielding, G. & Freeman, B. (Eds): The Geometry of Normal Faults. Geological Society of London Special Publication 56: 41–60.CrossRefGoogle Scholar
Long, A.J., 1995. Sea-level and crustal movements in the Thames estuary, Essex and east Kent. In: Bridgland, D.R., Allen, P. & Haggart, B.A. (eds) : The Quaternary of the Lower Reaches of the Thames, Field Guide. Quaternary Research Association (Durham, England): 99–105.Google Scholar
Long, A.J. & Tooley, M.J., 1995. Holocene sea-level and crustal movements in Hampshire and Southeast England, United Kingdom. In: Holocene Cycles: Climate, Sea Levels, and Sedimentation. Journal of Coastal Research, Special Issue 17: 299–310.Google Scholar
Long, A.J., Scaife, R.G. & Edwards, R.J., 2000. Stratigraphie architecture, relative sea-level, and models of estuary development in southern England: new data from Southampton Water. In: Pye, K. & Allen, J.R.L. (eds): Coastal and Estuarine Environments: Sedimentology, Geomorphology and Geoarchaeology. Geological Society of London Special Publication 175: 253–279.Google Scholar
Luan, F.C. & Paterson, M.S., 1992. Preparation and deformation of synthetic aggregates of quartz. Journal of Geophysical Research 97: 301–320.CrossRefGoogle Scholar
Lucchitta, I., 1979. Late Cenozoic uplift of the southwestern Colorado Plateau and adjacent lower Colorado River region. Tectonophysics 61: 63–95.CrossRefGoogle Scholar
Maddy, D., 1997. Uplift-driven valley incision and river terrace formation in southern England. Journal of Quaternary Science 12: 539–545.3.0.CO;2-T>CrossRefGoogle Scholar
Maddy, D. & Bridgland, D.R., 2000. Accelerated uplift resulting from Anglian glacioisostatic rebound in the Middle Thames valley, UK?: Evidence from the river terrace record. Quaternary Science Reviews 19: 1581–1588.CrossRefGoogle Scholar
Maddy, D., Bridgland, D.R. & Green, C.P., 2000. Crustal uplift in southern England: Evidence from the river terrace records. Geomorphology 33: 167–181.CrossRefGoogle Scholar
Maddy, D., Bridgland, D.R. & Westaway, R., 2001. Uplift-driven valley incision and climate-controlled river terrace development in the Thames valley, UK. Quaternary International 79: 23–36.CrossRefGoogle Scholar
Maddy, D., Lewis, S.G., Scaife, R.G., Bowen, D.Q., Coope, G.R., Green, C.P., Hardaker, T., Keen, D.H., Rees-Jones, J., Parfitt, S. & Scott, K., 1998. The Upper Pleistocene deposits at Cassington, near Oxford, England. Journal of Quaternary Science 13: 205–231.3.0.CO;2-N>CrossRefGoogle Scholar
McKee, E.D. & McKee, E.H., 1972. Pliocene uplift of the Grand Canyon region - Time of drainage adjustment. Geological Society of America Bulletin 83: 1923–1932.CrossRefGoogle Scholar
Mitchell, J. & Westaway, R., 1999. Chronology of Neogene and Quaternary uplift and magmatism in the Caucasus: Constraints from K-Ar dating of volcanism in Armenia. Tectonophysics 304: 157–186.CrossRefGoogle Scholar
Molnar, P. & England, P., 1990. Late Cenozoic uplift of mountain ranges and global climate change: Chicken or egg? Nature 346: 29–34.CrossRefGoogle Scholar
Mudelsee, M. & Schulz, M., 1997. The Mid-Pleistocene climate transition: onset of 100 ka cycle lags ice volume build-up by 280 ka. Earth and Planetary Science Letters 151: 117–123.CrossRefGoogle Scholar
Pantin, H.M. & Evans, C.D.R., 1984. The Quaternary history of the central and southwestern Celtic Sea. Marine Geology 57: 259–293.CrossRefGoogle Scholar
Partridge, T.C. & R.R., Maud, 1987. Geomorphic evolution of southern Africa since the Mesozoic. South African Journal of Geology 90: 179–208.Google Scholar
Pazzaglia, F.J. & Gardner, T.W. 1994. Late Cenozoic flexural deformation of the middle U.S. Atlantic passive margin. Journal of Geophysical Research 99: 12143–12157.Google Scholar
Perissoratis, C. Piper, D.J.W. & Lykousis, V., 2000. Alternating marine and lacustrine sedimentation during late Quaternary in the Gulf of Corinth rift basin, central Greece. Marine Geology 167: 391–411.CrossRefGoogle Scholar
Preece, R.C., 1995. Mollusca from interglacial sediments at three critical sites in the Lower Thames. In: Bridgland, D.R., Allen, P. & Haggart, B.A. (Eds): The Quaternary of the Lower Reaches of the Thames, Field Guide. Quaternary Research Association (Durham, England): 55–60.Google Scholar
Ranalli, G., 1987. Rheology of the Earth: Deformation and Flow Processes in Geophysics and Geodynamics. Allen & Unwin (London, England): 366 pp.Google Scholar
Shackleton, N.J., Berger, A. & Peltier, W.R., 1990. An alternative astronomical calibration of the lower Pleistocene timescale based on ODP site 677. Transactions of the Royal Society of Edinburgh, Earth Sciences 81: 251–261.CrossRefGoogle Scholar
Shennan, I., 1989. Holocene crustal movements and sea-level changes in Great Britain. Journal of Quaternary Science 4: 77–89.CrossRefGoogle Scholar
Sibrava, V., 1972. The position of Czechoslovakia in the correlation system of the European Pleistocene. Sbornik Geologickych Ved Anthropozoikum, series A 8: 5–218 (in German with English summary).Google Scholar
Sibson, R.H., 1982. Fault zone models, heat flow, and the depth distribution of earthquakes in the continental crust of the United States. Bulletin of the Seismological Society of America 72: 151–163.Google Scholar
Smith, B.J., Whalley, W.B. & Warke, P.A., 1999. Uplift, Erosion, and Stability: Perspectives on Long-term Landscape Development. Geological Society of London Special Publication 162.Google Scholar
Stüwe, K., White, L. & Brown, R., 1994. The influence of eroding topography on steady-state isotherms. Application to fission track analysis. Earth and Planetary Science Letters 124: 63–74.Google Scholar
Sumbler, M.G., 2001. The Moretón Drift: a further clue to glacial chronology in central England. Proceedings of the Geologists’ Association 112:13–27.CrossRefGoogle Scholar
Summerfield, M.A. & Kirkbride, M.P., 1992. Climate and landscape response. Nature 355: 306.CrossRefGoogle Scholar
Tappin, D.R., Chadwick, R.A., Jackson, A.A., Wingfield, R.T.R. & Smith, N.J.P., 1994. The geology of Cardigan Bay and the Bristol Channel. British Geological Survey UK Offshore Regional Report. Her Majesty’s Stationery Office (London, England): 107 pp.Google Scholar
Turcotte, D.L. & Schubert, G., 1982. Geodynamics: Applications of Continuum Physics to Geological Problems. John Wiley & Sons (New York, New York): 450 pp.Google Scholar
Van den Berg, M.W., 1996. Fluvial sequences of the Maas: a 10 Ma record of neotectonics and climate change at various time-scales. Ph.D. Thesis, University of Wageningen, The Netherlands: 181 pp.Google Scholar
Van den Berg, M.W. & Van Hoof, T. 2001. The Maas terrace sequence at Maastricht, SE Netherlands: evidence for 200 m of late Neogene and Quaternary surface uplift. In: Maddy, D., Macklin, M.G. & Woodward, J.C. (eds): River Basin Sediment Systems: Archives of Environmental Change. Balkema (Abingdon, England): 45–86.Google Scholar
Veldkamp, A., 1996. Late Cenozoic landform development in East Africa: The role of near base level planation within the dynamic etchplanation concept. Zeitschrift für Geomorphologie, Neue Folge, Supplement 106: 25–40.Google Scholar
Westaway, R., 1990. Present-day kinematics of the plate boundary zone between Africa and Europe, from the Azores to the Aegean. Earth and Planetary Science Letters 96: 393–406.CrossRefGoogle Scholar
Westaway, R., 1992a. Analysis of tilting near normal faults using calculus of variations: Implications for upper-crustal stress and rheology. Journal of Structural Geology 14: 857–871.CrossRefGoogle Scholar
Westaway, R., 1992b. Seismic moment summation for historical earthquakes in Italy: tectonic implications. Journal of Geophysical Research 97: 15437–15464.CrossRefGoogle Scholar
Westaway, R., 1994a. Reevaluation of extension in the Pearl River Mouth basin, South China Sea: Implications for continental lithosphere deformation mechanisms. Journal of Structural Geology 16: 823–838.CrossRefGoogle Scholar
Westaway, R., 1994b. Evidence for dynamic coupling of surface processes with isostatic compensation in the lower crust during active extension of western Turkey. Journal of Geophysical Research 99: 20203–20223.CrossRefGoogle Scholar
Westaway, R., 1995. Crustal volume balance during the India-Eurasia collision and altitude of the Tibetan plateau: a working hypothesis. Journal of Geophysical Research 100: 15173–15194.CrossRefGoogle Scholar
Westaway, R., 1996. Quaternary elevation change in the Gulf of Corinth of central Greece. Philosophical Transactions of the Royal Society of London, Series A 354: 1125–1164.Google Scholar
Westaway, R., 1998. Dependence of active normal fault dips on lower-crustal flow regimes. Journal of the Geological Society of London 155: 233–253.CrossRefGoogle Scholar
Westaway, R., 1999. The mechanical feasibility of low-angle normal faulting. Tectonophysics 308: 407–443.CrossRefGoogle Scholar
Westaway, R., 2001. Flow in the lower continental crust as a mechanism for the Quaternary uplift of the Rhenish Massif, northwest Europe. In: Maddy, D., Macklin, M.G., Woodward, J.C. (Eds): River Basin Sediment Systems: Archives of Environmental Change. Balkema (Abingdon, England): 87–167.Google Scholar
Westaway, R., 2002a. Long-term river terrace sequences: Evidence for global increases in surface uplift rates in the Late Pliocene and early Middle Pleistocene caused by flow in the lower continental crust induced by surface processes. Netherlands Journal of Geosciences, this volume.CrossRefGoogle Scholar
Westaway, R., 2002b. The Quaternary evolution of the Gulf of Corinth, central Greece: coupling between surface processes and flow in the lower continental crust. Tectonophysics, submitted.CrossRefGoogle Scholar
Westaway, R., 2002c. Seasonal seismicity of northern California ahead of the great 1906 earmquake. Pure and Applied Geophysics, in press.CrossRefGoogle Scholar
Westaway, R., Maddy, D. & Bridgland, D.R., 2002. Flow in the lower continental crust as a mechanism for the Quaternary uplift of southeast England: constraints from the Thames terrace record. Quaternary Science Reviews, 21: 569–603.CrossRefGoogle Scholar
Whorlow, R.W., 1992. Rheological Techniques, 2nd edition, Ellis Horwood (New York, New York).Google Scholar