ORCID Profile
0000-0002-1767-8593
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Geology | Earth Sciences Not Elsewhere Classified | Basin Analysis | Geodynamics | Tectonics | Simulation And Modelling | Geophysics | Geochemistry | Artificial Intelligence and Image Processing | Geochronology And Isotope Geochemistry | Inorganic Geochemistry | Exploration Geochemistry | Structural Geology | Geotectonics | Instruments And Techniques | Electrical and Electromagnetic Methods in Geophysics | Inorganic Geochemistry Not Elsewhere Classified | Data Structures | Other Physical Sciences | Simulation and Modelling | Geochemistry Not Elsewhere Classified
ANZSRC Socio-Economic Objective (SEO)
Earth sciences | Mineral Exploration not elsewhere classified | Copper Ore Exploration | Information processing services | Application packages | Atmospheric composition | Oil and Gas Exploration | Oil Shale and Tar Sands Exploration | Expanding Knowledge in the Earth Sciences | Titanium Minerals, Zircon, and Rare Earth Metal Ore (e.g. Monazite) Exploration |
Related Links
Publications
Age of metamorphism and deformation in the Montagne Noire dome (French Massif Central): Tapping into the memory of fine-grained gneisses using monazite U-Th-Pb geochronology
Publisher: Elsevier BV
Date: 02-2020
Extension rates, crustal melting, and core complex dynamics
Publisher: Geological Society of America
Date: 05-2009
DOI: 10.1130/G25460A.1
Mapping landscape connectivity under tectonic and climatic forcing
Publisher: Copernicus GmbH
Date: 26-06-2019
Abstract: Abstract. Species distribution and richness ultimately result from complex interactions between biological, physical and environmental factors. It has been recently shown for a static natural landscape that the elevational connectivity, which measures the proximity of a site to others with similar habitats, is a key physical driver of local species richness. Here we examine changes in elevational connectivity during mountain building using a landscape evolution model. We find that under uniform tectonic and variable climatic forcing, connectivity peaks at mid-elevations when the landscape reaches its geomorphic steady-state and that orographic effect on geomorphic evolution tends to favour low connectivity on leeward facing catchments. Statistical comparisons between connectivity distribution and results from a metacommunity model confirm that landscape elevation connectivity explains to the first order species richness in simulated mountainous regions. Our results also predict that low connectivity areas which favour isolation, a driver for in-situ speciation, are distributed across the entire elevational range for simulated orogenic cycles. Rapid adjustments of catchment morphology after cessation of tectonic activity should reduce speciation by decreasing the number of isolated regions.
South China Sea documents the transition from wide continental rift to continental break up
Publisher: Springer Science and Business Media LLC
Date: 11-09-2020
DOI: 10.1038/S41467-020-18448-Y
Abstract: During extension, the continental lithosphere thins and breaks up, forming either wide or narrow rifts depending on the thermo-mechanical state of the extending lithosphere. Wide continental rifts, which can reach 1,000 km across, have been extensively studied in the North American Cordillera and in the Aegean domain. Yet, the evolutionary process from wide continental rift to continental breakup remains enigmatic due to the lack of seismically resolvable data on the distal passive margin and an absence of onshore natural exposures. Here, we show that Eocene extension across the northern margin of the South China Sea records the transition between a wide continental rift and highly extended ( km) continental margin. On the basis of high-resolution seismic data, we document the presence of dome structures, a corrugated and grooved detachment fault, and subdetachment deformation involving crustal-scale nappe folds and magmatic intrusions, which are coeval with supradetachment basins. The thermal and mechanical weakening of this broad continental domain allowed for the formation of metamorphic core complexes, boudinage of the upper crust and exhumation of middle/lower crust through detachment faulting. The structural architecture of the northern South China Sea continental margin is strikingly similar to the broad continental rifts in the North American Cordillera and in the Aegean domain, and reflects the transition from wide rift to continental breakup.
The role of asthenospheric flow during rift propagation and breakup
Publisher: Geological Society of America
Date: 08-12-2018
DOI: 10.1130/G39674.1
Single-phase vs two-phase rifting: Numerical perspectives on the accommodation of extension during continental break-up
Publisher: Elsevier BV
Date: 2021
Continental and oceanic core complexes
Publisher: Geological Society of America
Date: 21-12-2013
DOI: 10.1130/B30754.1
Brief immersion of southern Australia by change in relative plate speed
Publisher: Wiley
Date: 14-12-2022
DOI: 10.1111/TER.12637
Abstract: Dynamic subsidence and uplift of plates are often explained by the vertical motion of density anomalies in the mantle. Such models predict surface vertical motion rates of less than 100 m Myr −1 at long‐wavelengths with a timespan of tens of Myr. However, during periods of relative sea‐level stability, some of the phases of vertical motion on stable portions of plates have occurred at rates greater than 100 m Myr −1 during episodes that may last only a few Myr. Here, we show that vertical surface motions, with rates greater than 100 m Myr −1 and durations less than a few Myr, can be explained by changes in basal shear stress caused by variation in horizontal motion of a viscous plate relative to the asthenosphere. We apply our physical model to the short‐lived mid‐Eocene immersion of the southern margin of Australia.
Opalisation of the Great Artesian Basin (central Australia): An Australian story with a Martian twist
Publisher: Informa UK Limited
Date: 04-2013
Global warming of the mantle at the origin of flood basalts over supercontinents
Publisher: Geological Society of America
Date: 2007
DOI: 10.1130/G23240A.1
Statistical petrology reveals a link between supercontinents cycle and mantle global climate
Publisher: Mineralogical Society of America
Date: 12-2016
DOI: 10.2138/AM-2016-5868
Timing of formation and exhumation of the Montagne Noire double dome, French Massif Central
Publisher: Elsevier BV
Date: 2015
From lithospheric thickening and divergent collapse to active continental rifting
Publisher: Geological Society of London
Date: 2001
Supplemental Material: The role of surface processes in basin inversion and breakup unconformity
Publisher: Geological Society of America
Date: 29-11-2022
Abstract: Additional detail concerning the numerical method, internal and boundary conditions, and numerical parameters, and access to outputs of the entire suite of the numerical experiments.
Lithospheric scale gravitational flow: The impact of body forces on orogenic processes from Archaean to Phanerozoic
Publisher: Geological Society of London
Date: 2006
Isostatic constraints on the central Victorian lower crust: Implications for the tectonic evolution of the Lachlan Fold Belt
Publisher: Informa UK Limited
Date: 08-1999
The origin of contractional structures in extensional gneiss domes: Reply to comment
Publisher: Geological Society of America
Date: 09-01-2017
DOI: 10.1130/G38595.1
辽东半岛新房变质核杂岩形成机制及成矿指示意义
Publisher: Editorial Office of Earth Science
Date: 2020
Effects of initial weakness on rift architecture
Publisher: Geological Society of London
Date: 2007
DOI: 10.1144/SP282.18
Eclogite-facies shear zones-deep crustal reflectors?
Publisher: Elsevier BV
Date: 04-1994
Superimposed Neoarchaean and Paleoproterozoic tectonics in the Terre Adélie Craton (East Antarctica): Evidence from Th-U-Pb ages on monazite and 40Ar/39Ar ages
Publisher: Elsevier BV
Date: 12-2008
Lithospheric gravitational potential energy and past orogenesis: Implications for conditions of initial Basin and Range and Laramide deformation: Comment and Reply
Publisher: Geological Society of America
Date: 1999
Syn-collapse eclogite metamorphism and exhumation of deep crust in a migmatite dome: The P-T-t record of the youngest Variscan eclogite (Montagne Noire, French Massif Central)
Publisher: Elsevier BV
Date: 11-2015
The role of surface processes in basin inversion and breakup unconformity
Publisher: Geological Society of America
Date: 03-01-2023
DOI: 10.1130/G50833.1
Abstract: In the context of continental extension, transient compressional episodes (stress inversion) and phases of uplift (depth inversion) are commonly recorded with no corresponding change in plate motion. Changes in gravitational potential energy during the rifting process have been invoked as a possible source of compressional stresses, but their magnitude, timing, and relationship with depth inversions remain unclear. Using high-resolution two-dimensional numerical experiments of the full rifting process, we track the dynamic interplay between the far-field tectonic forces, loading and unloading of the surface via surface processes, and gravitational body forces. Our results show that rift basins tend to localize compressive stresses they record transient phases of compressional stresses as high as 30 MPa and experience a profound depth inversion, 2 km in magnitude, when sediment supply ceases, providing an additional driver for the breakup unconformity, a well-documented phase of regional uplift typically associated with continental breakup.
Protracted fluid–rock interaction in the Mesoarchaean and implication for gold mineralization: Example from the Warrawoona syncline (Pilbara, Western Australia)
Publisher: Elsevier BV
Date: 08-2008
The Scandinavian Caledonides and their relationship to the Variscan belt
Publisher: Geological Society of London
Date: 1997
A graphical user interface for particle-in-cell finite element analysis of lithospheric deformation and mantle convection in two dimensions
Publisher: Elsevier BV
Date: 08-2007
Fragmentation of active continental plate margins owing to the buoyancy of the mantle wedge
Publisher: Springer Science and Business Media LLC
Date: 21-03-2010
DOI: 10.1038/NGEO825
Lower crustal flow kept Archean continental flood basalts at sea level
Publisher: Geological Society of America
Date: 12-2011
DOI: 10.1130/G32231.1
The nature and origin of pigments in black opal from Lightning Ridge, New South Wales, Australia
Publisher: Informa UK Limited
Date: 04-2019
Deep crustal source of gneiss dome revealed by eclogite in migmatite (Montagne Noire, French Massif Central)
Publisher: Wiley
Date: 19-02-2020
DOI: 10.1111/JMG.12523
Burial and exhumation during Archean sagduction in the East Pilbara Granite-Greenstone Terrane
Publisher: Elsevier BV
Date: 06-2014
A case for late-Archaean continental emergence from thermal evolution models and hypsometry
Publisher: Elsevier BV
Date: 11-2008
Composition and origin of fluids associated with lode gold deposits in a Mesoarchean greenstone belt (Warrawoona Syncline, Pilbara Craton, Western Australia) using synchrotron radiation X-ray fluorescence
Publisher: Springer Science and Business Media LLC
Date: 18-07-2006
Viscous collision in channel explains double domes in metamorphic core complexes: REPLY
Publisher: Geological Society of America
Date: 10-2012
DOI: 10.1130/G33202Y.1
Increasing the usability and accessibility of geodynamic modelling tools to the geoscience community: UnderworldGUI
Publisher: Springer Science and Business Media LLC
Date: 23-06-2008
Drainage and Sedimentary Responses to Dynamic Topography
Publisher: American Geophysical Union (AGU)
Date: 19-12-2019
DOI: 10.1029/2019GL084400
Timing of partial melting and granulite formation during the genesis of high to ultra‐high temperature terranes: Insight from numerical experiments
Publisher: Wiley
Date: 14-01-2022
DOI: 10.1111/TER.12577
Abstract: Long‐lived high to ultra‐high temperature (HT‐UHT) granulitic terranes formed throughout Earth's history. Yet, the detailed processes involved in their formation remain unresolved and notably the sequence of appearance and duration of migmatisation and granulites conditions in the orogenic cycle. These processes can be evaluated by analytical and numerical models. First, solving the steady‐state heat equation allows underlining the interdependency of the parameters controlling the crustal geotherm at thermal equilibrium. Second, performing two‐dimensional thermo‐mechanical experiments of an orogenic cycle, from shortening to gravitational collapse, allows to consider non‐steady‐state geotherms and understand how deformation velocity may affect the relative timing of migmatite and granulite formation. These numerical experiments with elevated radiogenic heat production and slow shortening rates allow the formation of large volumes of prograde migmatites and granulites going through the sillimanite field as observed in many HT‐UHT terranes. Finally, the interplay between these parameters can explain the difference in predicted pressure‐temperature‐time paths that can be compared with the natural rock archive.
Supplemental Material: The role of surface processes in basin inversion and breakup unconformity
Publisher: Geological Society of America
Date: 29-11-2022
DOI: 10.1130/GEOL.S.21644681.V1
Abstract: Additional detail concerning the numerical method, internal and boundary conditions, and numerical parameters, and access to outputs of the entire suite of the numerical experiments.
The Role of Isostasy in the Evolution and Architecture of Fold and Thrust Belts
Publisher: GeoScienceWorld
Date: 04-02-2023
DOI: 10.2113/2023/8503619
Abstract: Warmer conditions prevalent in the hinterland of orogenic systems facilitate local ductile flow underneath the surface load, making Airy-like local isostasy more prevalent in these domains. In contrast, flexural isostasy better describes the regional response to surface loading of more rigid lithospheres. Here, we explore how the interaction between horizontal tectonic mass transfer and vertical isostatic mass transfer, through either elastic flexure or viscous flow, impacts the overall architecture of fold and thrust belts. We compare numerical models of fold and thrust belts under either an Airy-like ductile isostasy boundary condition or a flexural-like regional isostasy boundary condition. Our experiments suggest that when ductile flow is involved in accommodating isostatic adjustment, subsidence is rather local, larger, and results in narrower, less elevated fold-thrust belts with a complex internal architecture consisting of prominent steeply dipping faults. When isostatic subsidence is controlled by lithospheric flexure, the tilting of the basement on 10 s of km scale facilitates the outward propagation of fold-thrust belts. The internal architecture is simpler and involves prominent basement-parallel décollements. The outcome is wider fold and thrust belts with higher topographies. A change in lithospheric elastic thickness does not significantly affect fold-thrust belt structural styles. Our results are compared to natural ex les from the Subandean zone.
Global warming of the mantle beneath continents back to the Archaean
Publisher: Elsevier BV
Date: 06-2009
The geodynamics of mantle melting
Publisher: Geological Society of America
Date: 04-2015
Neoarchean lithospheric strengthening and the coupling of Earth's geochemical reservoirs
Publisher: Geological Society of America
Date: 2008
DOI: 10.1130/G25031A.1;
Limit of channel flow in orogenic plateaux
Publisher: GeoScienceWorld
Date: 10-2010
DOI: 10.1130/L114.1
A deep subaqueous fan depositional model for the Palaeoarchaean (3.46 Ga) Marble Bar Cherts, Warrawoona Group, Western Australia
Publisher: Cambridge University Press (CUP)
Date: 02-04-2012
DOI: 10.1017/S0016756812000131
Abstract: The 3.46 Ga Marble Bar Chert Member of the East Pilbara Craton, Western Australia, is one of the earliest and best-preserved sedimentary successions on Earth. Here, we interpret the finely laminated thin-bedded cherts, mixed conglomeratic beds, chert breccia beds and chert folded beds of the Marble Bar Chert Member as the product of low-density turbidity currents, high-density turbidity currents, mass transport complexes and slumps, respectively. Integrated into a channel-levee depositional model, the Marble Bar Chert Member constitutes the oldest documented deep-sea fan on Earth, with thin-bedded cherts, breccia beds and slumps composing the outer levee facies tracts, and scours and conglomeratic beds representing the channel systems.
Orogen-parallel flow during continental convergence: Numerical experiments and archean field examples
Publisher: Geological Society of America
Date: 2007
DOI: 10.1130/G23540A.1
Australian paleo-stress fields and tectonic reactivation over the past 100 Ma
Publisher: Informa UK Limited
Date: 02-2012
Hundred million years of landscape dynamics from catchment to global scale
Publisher: American Association for the Advancement of Science (AAAS)
Date: 03-03-2023
Abstract: Our capability to reconstruct past landscapes and the processes that shape them underpins our understanding of paleo-Earth. We take advantage of a global-scale landscape evolution model assimilating paleoelevation and paleoclimate reconstructions over the past 100 million years. This model provides continuous quantifications of metrics critical to the understanding of the Earth system, from global physiography to sediment flux and stratigraphic architectures. We reappraise the role played by surface processes in controlling sediment delivery to the oceans and find stable sedimentation rates throughout the Cenozoic with distinct phases of sediment transfer from terrestrial to marine basins. Our simulation provides a tool for identifying inconsistencies in previous interpretations of the geological record as preserved in sedimentary strata, and in available paleoelevation and paleoclimatic reconstructions.
The origin of contractional structures in extensional gneiss domes
Publisher: Geological Society of America
Date: 12-05-2017
DOI: 10.1130/G39229Y.1
Numerical investigation of deep-crust behavior under lithospheric extension
Publisher: Elsevier BV
Date: 02-2018
Quantitative stratigraphic analysis in a source-to-sink numerical framework
Publisher: Copernicus GmbH
Date: 28-06-2019
Abstract: Abstract. The sedimentary architecture at continental margins reflects the interplay between the rate of change of accommodation creation (δA) and the rate of change of sediment supply (δS). Stratigraphic interpretation increasingly focuses on understanding the link between deposition patterns and changes in δA∕δS, with an attempt to reconstruct the contributing factors. Here, we use the landscape modelling code pyBadlands to (1) investigate the development of stratigraphic sequences in a source-to-sink context (2) assess the respective performance of two well-established stratigraphic interpretation techniques: the trajectory analysis method and the accommodation succession method and (3) propose quantitative stratigraphic interpretations based on those two techniques. In contrast to most stratigraphic forward models (SFMs), pyBadlands provides self-consistent sediment supply to basin margins as it simulates erosion, sediment transport and deposition in a source-to-sink context. We present a generic case of landscape evolution that takes into account periodic sea level variations and passive margin thermal subsidence over 30 million years, under uniform rainfall. A set of post-processing tools are provided to analyse the predicted stratigraphic architecture. We first reconstruct the temporal evolution of the depositional cycles and identify key stratigraphic surfaces based on observations of stratal geometries and facies relationships, which we use for comparison to stratigraphic interpretations. We then apply both the trajectory analysis and the accommodation succession methods to manually map key stratigraphic surfaces and define sequence units on the final model output. Finally, we calculate shoreline and shelf-edge trajectories, the temporal evolution of changes in relative sea level (proxy for δA) and sedimentation rate (proxy for δS) at the shoreline, and automatically produce stratigraphic interpretations. Our results suggest that the analysis of the presented model is more robust with the accommodation succession method than with the trajectory analysis method. Stratigraphic analysis based on manually extracted shoreline and shelf-edge trajectory requires calibrations of time-dependent processes such as thermal subsidence or additional constraints from stratal terminations to obtain reliable interpretations. The 3-D stratigraphic analysis of the presented model reveals small lateral variations of sequence formations. Our work provides an efficient and flexible quantitative sequence stratigraphic framework to evaluate the main drivers (climate, sea level and tectonics) controlling sedimentary architectures and investigate their respective roles in sedimentary basin development.
Viscous collision in channel explains double domes in metamorphic core complexes
Publisher: Geological Society of America
Date: 04-2011
DOI: 10.1130/G31587.1
Orogen-parallel flow during continental convergence: Numerical experiments and Archean field examples: Reply
Publisher: Geological Society of America
Date: 2007
DOI: 10.1130/G24480Y.1
Gravitational collapse of the continental crust: Definition, regimes and modes
Publisher: Elsevier BV
Date: 12-2001
Origin of silica and fingerprinting of Australian sedimentary opals
Publisher: Elsevier BV
Date: 02-2015
The role of partial melting and extensional strain rates in the development of metamorphic core complexes
Publisher: Elsevier BV
Date: 11-2009
Strain and retrogression partitioning explain long-term stability of crustal roots in stable continents
Publisher: Geological Society of America
Date: 17-04-2020
DOI: 10.1130/G47301.1
Abstract: Away from tectonically active regions, the continental crust has an average thickness of 40 ± 1 km. Yet, it shows a remarkable variability from 25 to 65 km, comparable to that of the most tectonically active regions. Here, we consider the problem of the formation and preservation of anomalous deep crustal roots in stable intracontinental regions. Using two-dimensional thermomechanical experiments, we show that the interplay between partial melting, the formation of garnet-pyroxene-bearing rocks, and their strain rate–dependent retrogression result in the preservation of thick and strong crustal roots. We argue that it is the partitioning into narrow regions of strain, retrogression, and weakening coupled into a positive feedback loop that explains why strong high-grade crustal roots remain largely immune to gravitational stresses and are able to persist over hundreds of millions of years.
P wave velocity across a noncoaxial ductile shear zone and its associated strain gradient: consequences for upper crustal reflectivity
Publisher: American Geophysical Union (AGU)
Date: 10-03-1994
DOI: 10.1029/93JB03105
UWGeodynamics: A teaching and research tool for numerical geodynamic modelling
Publisher: The Open Journal
Date: 11-04-2019
DOI: 10.21105/JOSS.01136
Two-step Gravity Inversion Reveals Variable Architecture of African Cratons
Publisher: Frontiers Media SA
Date: 20-12-2021
DOI: 10.3389/FEART.2021.696674
Abstract: The lithospheric build-up of the African continent is still to a large extent unexplored. In this contribution, we present a new Moho depth model to discuss the architecture of the three main African cratonic units, which are: West African Craton, Congo Craton, and Kalahari Craton. Our model is based on a two-step gravity inversion approach that allows variable density contrasts across the Moho depth. In the first step, the density contrasts are varied for all non-cratonic units, in the second step for the three cratons in idually. The lateral extension of the tectonic units is defined by a regionalization map, which is calculated from a recent continental seismic tomography model. Our Moho depth is independently constrained by pointwise active seismics and receiver functions. Treating the constraints separately reveals a variable range of density contrasts and different trends in the estimated Moho depth for the three cratons. Some of the estimated density contrasts vary substantially, caused by sparse data coverage of the seismic constraints. With a density contrast of Δ ρ = 200 kg/ m 3 the Congo Craton features a cool and undisturbed lithosphere with smooth density contrasts across the Moho. The estimated Moho depth shows a bimodal pattern with average Moho depth of 39–40 km for the Kalahari and Congo Cratons and 33–34 km for the West African Craton. We link our estimated Moho depth with the cratonic extensions, imaged by seismic tomography, and with topographic patterns. The results indicate that cratonic lithosphere is not necessarily accompanied by thick crust. For the West African Craton, the estimated thin crust, i.e. shallow Moho, contrasts to thick lithosphere. This discrepancy remains enigmatic and requires further studies.
Spreading continents kick-started plate tectonics
Publisher: Springer Science and Business Media LLC
Date: 09-2014
DOI: 10.1038/NATURE13728
Abstract: Stresses acting on cold, thick and negatively buoyant oceanic lithosphere are thought to be crucial to the initiation of subduction and the operation of plate tectonics, which characterizes the present-day geodynamics of the Earth. Because the Earth's interior was hotter in the Archaean eon, the oceanic crust may have been thicker, thereby making the oceanic lithosphere more buoyant than at present, and whether subduction and plate tectonics occurred during this time is ambiguous, both in the geological record and in geodynamic models. Here we show that because the oceanic crust was thick and buoyant, early continents may have produced intra-lithospheric gravitational stresses large enough to drive their gravitational spreading, to initiate subduction at their margins and to trigger episodes of subduction. Our model predicts the co-occurrence of deep to progressively shallower mafic volcanics and arc magmatism within continents in a self-consistent geodynamic framework, explaining the enigmatic multimodal volcanism and tectonic record of Archaean cratons. Moreover, our model predicts a petrological stratification and tectonic structure of the sub-continental lithospheric mantle, two predictions that are consistent with xenolith and seismic studies, respectively, and consistent with the existence of a mid-lithospheric seismic discontinuity. The slow gravitational collapse of early continents could have kick-started transient episodes of plate tectonics until, as the Earth's interior cooled and oceanic lithosphere became heavier, plate tectonics became self-sustaining.
Seismic and tectono‐metamorphic characters of the lower continental crust in Phanerozoic areas: A consequence of post‐thickening extension
Publisher: American Geophysical Union (AGU)
Date: 04-1993
DOI: 10.1029/92TC01568
Biological control of Cl/Br and low sulfate concentration in a 3.5-Gyr-old seawater from North Pole, Western Australia
Publisher: Elsevier BV
Date: 12-2004
Lower crustal rejuvenation and growth during post-thickening collapse: insights from a crustal cross section through a Variscan metamorphic core complex
Publisher: Geological Society of America
Date: 1995
Archean gravity-driven tectonics on hot and flooded continents: Controls on long-lived mineralised hydrothermal systems away from continental margins
Publisher: Elsevier BV
Date: 05-2013
A glimpse into a possible geomorphic future of Tibet
Publisher: Springer Science and Business Media LLC
Date: 28-09-2022
bioLEC: A Python package to measure Landscape Elevational Connectivity
Publisher: The Open Journal
Date: 25-07-2019
DOI: 10.21105/JOSS.01530
Contribution of mantle plumes, crustal thickening and greenstone blanketing to the 2.75-2.65 Ga global crisis
Publisher: Elsevier BV
Date: 11-2003
The impact of rheological uncertainty on dynamic topography predictions
Publisher: Copernicus GmbH
Date: 20-12-2019
Abstract: Abstract. Much effort is being made to extract the dynamic components of the Earth's topography driven by density heterogeneities in the mantle. Seismically mapped density anomalies have been used as an input into mantle convection models to predict the present-day mantle flow and stresses applied on the Earth's surface, resulting in dynamic topography. However, mantle convection models give dynamic topography litudes generally larger by a factor of ∼2, depending on the flow wavelength, compared to dynamic topography litudes obtained by removing the isostatically compensated topography from the Earth's topography. In this paper, we use 3-D numerical experiments to evaluate the extent to which the dynamic topography depends on mantle rheology. We calculate the litude of instantaneous dynamic topography induced by the motion of a small spherical density anomaly (∼100 km radius) embedded into the mantle. Our experiments show that, at relatively short wavelengths ( km), the litude of dynamic topography, in the case of non-Newtonian mantle rheology, is reduced by a factor of ∼2 compared to isoviscous rheology. This is explained by the formation of a low-viscosity channel beneath the lithosphere and a decrease in thickness of the mechanical lithosphere due to induced local reduction in viscosity. The latter is often neglected in global mantle convection models. Although our results are strictly valid for flow wavelengths less than 1000 km, we note that in non-Newtonian rheology all wavelengths are coupled, and the dynamic topography at long wavelengths will be influenced.
Remarks on the age of precious opal in central Australia: reply to comment by Bruce Dickson
Publisher: Informa UK Limited
Date: 12-2013
The evolution of the 87Sr/86Sr of marine carbonates does not constrain continental growth
Publisher: Elsevier BV
Date: 05-2013
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