Transient convective uplift of an ancient buried landscape

Hartley, Ross A.; Roberts, G.G.; White, Nicky; Richardson, Chris N.

doi:10.1038/ngeo1191

Cited by 138 publications

(213 citation statements)

References 22 publications

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“…Other proposed linkages between rivers and landscape evolution exist, including the notion (deeply engrained in the 'theoretical geomorphology' literature) that much can be discerned from knickpoints in river long profiles. These short steep reaches are hypothesized to have formed in relation to a fall in base level, such as would occur at the coast in response to sea-level fall, and then propagated upstream over periods as long as millions of years (e.g., Bishop , 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2007; Pritchard et al, 2009;Roberts and White, 2010;Hartley et al, 2011;cf. Bridgland and Westaway, 2012).…”

Section: An Alternative Mechanism: Knick-point Recessionmentioning

confidence: 99%

Quaternary fluvial archives and landscape evolution: a global synthesis

Bridgland

Westaway

2014

Proceedings of the Geologists' Association

119

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract: Late Cenozoic (and especially Quaternary) fluvial deposits and related landforms provide valuable information about landscape evolution, not just in terms of changing drainage patterns but also documenting changes in topography and relief. Recently compiled records from river systems worldwide have shed much light on this subject, particularly records of terrace sequences, although other types of fluvial archive can be equally informative. Terraces are especially valuable if they can be dated with reference to biostratigraphy, geochronology or by other means. The various data accumulated support the hypothesis that the incision observed from river terraces has been a response to progressive uplift during the Late Cenozoic. This has not occurred everywhere, however. Stacked fluvial sequences have formed in subsiding depocentres and have greater potential for surviving to become part of the longer-term geological record. More enigmatic are regions in the ancient cores of continents (cratons), which show little indication of sustained uplift or subsidence, with fluvial deposits of various ages occurring within a restricted range of elevation with respect to the valley floor. In areas of dynamic crust that were glaciated during the Last Glacial Maximum post-glacial river valleys are typically incised and often terraced in a similar way to valleys on post-Precambrian crust elsewhere, although the terraces and gorges in these systems are very much younger (~15 ka) and therefore the processes have been considerably more rapid. This paper is illustrated with various case-study examples of these different types of archives and discusses the implications of each for regional landscape evolution.

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Section: An Alternative Mechanism: Knick-point Recessionmentioning

confidence: 99%

Quaternary fluvial archives and landscape evolution: a global synthesis

Bridgland

Westaway

2014

Proceedings of the Geologists' Association

119

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“…Revisiting poorly understood aspects of the geological record combined with sophisticated modeling of mantle flow has recently led to renewed interest in constraining and quantifying the dynamic contribution to surface topography [Mitrovica et al, 1989;Gurnis et al, 2000;Conrad and Gurnis, 2003;Forte et al, 2007;Hartley et al, 2011]. A summary of recent investigations on the subject can be found in Braun [2010].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the amplitude and timing of dynamic topography might be better constrained by interrogating the past, whether it is through the sedimentary [Mitrovica et al, 1989;Heine et al, 2008], geomorphological [Hartley et al, 2011] or thermochronological record [Flowers and Schoene, 2010], as the time-integrated effect of mantle flow is less sensitive to our knowledge of crustal thickness.…”

Section: Introductionmentioning

confidence: 99%

Eroding dynamic topography

Braun

Robert

Simon‐Labric

2013

Geophysical Research Letters

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[1] Geological observations of mantle flow-driven dynamic topography are numerous, especially in the stratigraphy of sedimentary basins; on the contrary, when it leads to subaerial exposure of rocks, dynamic topography must be substantially eroded to leave a noticeable trace in the geological record. Here, we demonstrate that despite its low amplitude and long wavelength and thus very low slopes, dynamic topography is efficiently eroded by fluvial erosion, providing that drainage is strongly perturbed by the mantle flow driven surface uplift. Using simple scaling arguments, as well as a very efficient surface processes model, we show that dynamic topography erodes in direct proportion to its wavelength. We demonstrate that the recent deep erosion experienced in the Colorado Plateau and in central Patagonia is likely to be related to the passage of a wave of dynamic topography generated by mantle upwelling.

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“…In a related paper, Hartley et al 2 invoke an identical mechanism to explain the formation of an exquisite ancient landscape about 55-57 million years ago. Located west of the Orkney-Shetland Islands, the landscape is today buried beneath about two kilometres of sedimentary rock on the ocean floor.…”

Section: News and Viewsmentioning

confidence: 97%

“…The convective circulation that drives upwellings and downwellings in Earth's mantle can cause the surface of the planet to rise up and subside. Writing in Nature Geoscience, Poore et al 1 and Hartley et al 2 demonstrate an intriguing connection between the ascent and lateral spreading of pulses of hot material in the Iceland mantle plume and patterns of uplift of the North Atlantic Ocean floor.…”

Section: News and Viewsmentioning

confidence: 98%

Surface impact of mantle processes

Allen

2011

Nature Geosci

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Transient convective uplift of an ancient buried landscape

Cited by 138 publications

References 22 publications

Quaternary fluvial archives and landscape evolution: a global synthesis

Quaternary fluvial archives and landscape evolution: a global synthesis

Eroding dynamic topography

Surface impact of mantle processes

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