A5046180202- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Geological formations and processes
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Seismic Imaging and Inversion Techniques
- Geomagnetism and Paleomagnetism Studies
- Reservoir Engineering and Simulation Methods
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies Worldwide
- Landslides and related hazards
- Winter Sports Injuries and Performance
- Geotechnical and Geomechanical Engineering
- Marine and environmental studies
- Drilling and Well Engineering
- Earthquake Detection and Analysis
- Geophysical and Geoelectrical Methods
- Seismology and Earthquake Studies
- Oceanographic and Atmospheric Processes
Australian National University
2021-2025
Planetary Science Institute
2018-2022
Harvard University
2018-2022
Lamont-Doherty Earth Observatory
2020-2021
Columbia University
2020-2021
Harvard University Press
2019-2020
University of Cambridge
2014-2018
Abstract Convective circulation of the mantle causes deflections Earth's surface that vary as a function space and time. Accurate measurements this dynamic topography are complicated by need to isolate remove other sources elevation, arising from flexure lithospheric isostasy. The complex architecture continental lithosphere means measurement present‐day is more straightforward in oceanic realm. Here we present an updated methodology for calculating residual bathymetry, which proxy...
Abstract Half‐space cooling and plate models of varying complexity have been proposed to account for changes in basement depth heat flow as a function lithospheric age the oceanic realm. Here, we revisit this well‐known problem by exploiting revised augmented database 2,028 measurements basement, corrected sedimentary loading variable crustal thickness, 3,597 measurements. Joint inverse modeling both databases shows that half‐space model yields mid‐oceanic axial temperature is >100°C...
Abstract It is agreed that mantle dynamics have played a role in generating and maintaining the elevated topography of Anatolia during Neogene times. However, there debate about relative importance subduction zone asthenospheric processes. Key issues concern onset cause regional uplift, thickness lithospheric plate, presence/absence temperature and/or compositional anomalies within convecting mantle. Here, we tackle these interlinked by analyzing modeling two disparate suites observations....
Abstract Oceanic residual depth varies on 5,000 km wavelengths with amplitudes of ± 1 km. A component this short‐wavelength signal is dynamic topography caused by convective flow in the upper ∼ 300 mantle. It exerts a significant influence landscape evolution and sea level change, but its contribution often excluded geodynamic models whole‐mantle flow. Using seismic tomography to resolve buoyancy anomalies oceanic mantle complicated dominant lithospheric cooling velocity structure. Here, we...
Rapid uplift of marine sectors exposed by WAIS collapse amplified GMSL rise in the past and will do so future.
Despite its importance, the spatial and temporal pattern of dynamic topography generated by mantle convective circulation is poorly known. We present accurate estimates from oceanic basins continental margins surrounding Australia. Our starting point measurement residual depth anomalies on oldest floor adjacent to shelf. These were determined a combined dataset ~200 seismic reflection wide‐angle images well‐sedimented crust. They have amplitudes between −1 km +0.5 km, their variation broadly...
Prior to inferring ice sheet stability from past interglacial sea-level records, these records must first be corrected for the contaminating effects of glacial isostatic adjustment (GIA). Typical GIA corrections, however, neglect variability in signal that may introduced by Earth's 3-D rheological structure. We predict changes due a collapse West Antarctic Ice Sheet (WAIS) over an idealized 6 kyr-duration using four viscoelastic Earth models. Two are viscosity models inferred seismic...
Abstract Geodynamic models of mantle convection predict that Mexico and western North America share a history dynamic support. We calculate admittance between gravity topography, which indicates the elastic thickness plate in is 11 km it 12 km. Admittance at wavelengths > 500 these regions suggests topography partly supported by subcrustal processes. These results corroborate estimates residual from isostatic calculations suggest amount American may exceed 1 The Cenozoic magmatism,...
Abstract A multidisciplinary approach is used to analyze the Cenozoic uplift history of South America. Residual depth anomalies oceanic crust abutting this continent help determine pattern present‐day dynamic topography. Admittance analysis and crustal thickness measurements indicate that elastic Borborema Altiplano regions km with evidence for sub‐plate support at longer wavelengths. drainage inventory 1827 river profiles assembled investigate landscape development. Linear inverse modeling...
The mapping between far-field relative sea level (RSL) records and changes in ice volume or global mean (GMSL) involves a correction for glacial isostatic adjustment (GIA). This is thus sensitive to uncertainties inherent GIA modeling, including the spatio-temporal history of mass viscoelastic Earth structure. Here, we investigate effect incorporating lateral variations structure on predicting order determine if this source model uncertainty significantly impacts estimates at Last Glacial...
Abstract Paleoshorelines serve as measures of ancient sea level and ice volume but are affected by solid Earth deformation including processes such glacial isostatic adjustment (GIA) mantle dynamic topography (DT). The early Pliocene Epoch is an important target for sea‐level reconstructions it contains information about the stability sheets during a climate warmer than today. Along southeastern passive margin Argentina, three paleoshorelines date to times (4.8–5.5 Ma), their variable...
It is generally accepted that the Arabian Peninsula has been uplifted by subcrustal processes. Positive residual depth anomalies from oceanic crust in Red Sea and Gulf of Aden suggest a region surrounding this peninsula dynamically supported. Admittance calculations, surface wave tomography studies, receiver function analyses all imply regional topography generated maintained some combination mantle convective circulation lithospheric thickness changes. Despite these significant advances,...
Abstract Peninsular India is a cratonic region with asymmetric relief manifest by eastward tilting from the 1.5 km high Western Ghats escarpment toward floodplains of eastward‐draining rivers. Oceanic residual depth measurements on either side show that this west‐east asymmetry broader scale, occurring over distances > 2000 km. Admittance analysis free‐air gravity and topography shows elastic thickness 10 ± 3 km, suggesting regional uplift not solely caused flexural loading. To...
Abstract African basin‐and‐swell morphology is often attributed to the planform of subplate mantle convection. Across North Africa, coincidence Neogene and Quaternary (i.e., <23 Ma) magmatism, topographic swells, long wavelength gravity anomalies, slow shear wave velocity anomalies within asthenosphere provides observational constraints for this hypothesis. Admittance analysis fields corroborates existence support. To investigate quantitative relationships between intraplate velocity,...
SUMMARY It is generally agreed that the Last Interglacial (LIG; ∼130–115 ka) was a time when global average temperatures and mean sea level were higher than they are today. However, exact timing, magnitude spatial pattern of ice melt much debated. One difficulty in extracting past from local observations their elevations need to be corrected for glacial isostatic adjustment (GIA), which requires knowledge Earth’s internal viscoelastic structure. While this structure assumed radially...
Abstract The North Australian Zinc Belt is the largest zinc-lead province in world, containing three of ten known individual deposits (HYC, Hilton-George Fisher, and Mount Isa). Northern Cordillera America second province, a further two world’s top (Red Dog Howards Pass). Despite this world-class endowment, exploration both mineral provinces during past 2 decades has not been particularly successful, yielding only significant discoveries (Teena, Australia, Boundary, Canada). One most...
Abstract The concept that oceanic lithosphere mechanically limits upwelling and decompression melting of mantle plumes is known as the lid effect backed up by observations ocean island basalt (OIB) geochemistry. Nevertheless, in a recent companion study on OIB geochemistry, several additional factors were identified further influence compositions including melt‐flux filter , whereby with small melt fluxes progressively fail to be sampled regions thicker lithosphere. Here, we use 3‐D coupled...