A5023295824- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geological and Geophysical Studies
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- High-pressure geophysics and materials
- Methane Hydrates and Related Phenomena
- Geological and Geophysical Studies Worldwide
- Seismic Imaging and Inversion Techniques
- Geology and Paleoclimatology Research
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Geological and Tectonic Studies in Latin America
- Seismic Waves and Analysis
- Reservoir Engineering and Simulation Methods
- Geochemistry and Geologic Mapping
- Paleontology and Stratigraphy of Fossils
- Geological Modeling and Analysis
- Seismology and Earthquake Studies
- Geotechnical and Geomechanical Engineering
- Hydraulic Fracturing and Reservoir Analysis
- Rock Mechanics and Modeling
- Geological Formations and Processes Exploration
- Marine and environmental studies
University of Liverpool
2016-2025
Imperial College London
2018
Conference Board
2018
Burlington College
2018
Geological Society of London
2018
TGS (United Kingdom)
2018
Liverpool Hospital
2010
Keele University
1980-1987
Durham University
1977-1979
Institute of Geological Sciences
1976
Summary The response of lithosphere to an applied tectonic tensile force and the resulting stress distribution with depth has been investigated using a mathematical model incorporating elastic, plastic brittle behaviour lithospheric material. Lithospheric strength is shown be primarily controlled by rheology as consequence critically dependent on geothermal gradient composition. rheologies upper crust, lower crust mantle are assumed dislocation creep in quartz, plagioclase olivine...
The Bay of Biscay and the Pyrenees correspond to a Lower Cretaceous rift system including both oceanic hyperextended domains. transition from preserved domains in West their complete inversion East enables us study progressive reactivation system. We use seismic interpretation, gravity inversion, field mapping identify map former subsequent reactivation. propose new sections across illustrating integration into orogen. This aims provide insights on formation systems discuss role during Two...
The Maturín Basin in eastern Venezuela is considered a good example of peripheral foreland basin. Earthquake and tomographic data indicate that affected by the oblique subduction South American Plate underneath Caribbean Plate. New forward flexural isostatic modeling has been carried out order to determine whether was generated purely thrust sheet loading from Serranía Monagas Foreland Thrust Belts. A sequence models middle Miocene Present for 3 profiles across del Interior Belt, Basin....
Abstract Mathematical models have been constructed of the geometric, thermal and flexural-isostatic response lithosphere to extension by faulting (simple-shear) in upper crust plastic, distributed deformation (pure-shear) lower mantle. Models involving upper-crustal both listric planar faults developed. These coupled simple-shear/pure-shear used calculate extensional sedimentary basin geometry, subsidence history crustal structure. Basin geometry are controlled fault (planar or listric),...
Studies conducted in present‐day magma‐poor rifted margins reveal that the transition from weakly thinned continental crust (∼30 km) proximal to hyper‐extended (≤10 distal occurs within a narrow zone, referred as necking zone. We have identified relics of zone and adjacent margin Campo, Grosina Bernina units fossil Alpine Tethys investigated deformation sedimentary processes associated with extreme crustal thinning during rifting. Within basement rocks we show that: (1) represents pre‐rift...
We focus on the Iberian-European plate boundary (IEPB), whose nature, age, and evolution are strongly debated. In contrast to previous interpretations of IEPB as a major lithospheric-scale left-lateral strike-slip fault, we propose more complex deformation history. The mapping rift domains at transition between Iberia Europe emphasizes existence spatially disconnected systems. Based their restoration, suggest that was partitioned set distinct transtensional systems from Late Jurassic Early...
Abstract We focus on the southern North Atlantic rifted margins to investigate partitioning and propagation of deformation in hyperextended rift systems using plate kinematic modeling. The evolution this area is well determined by oceanic magnetic anomalies after Cretaceous normal polarity superchron. However, early seafloor spreading (200–83 Ma) remains highly disputed due contentious interpretations J anomaly Iberia‐Newfoundland conjugate margins. Recent studies highlight that probably...
Abstract Depth-uniform stretching is not the dominant deformation process for thinning continental lithosphere leading to breakup; it cannot explain observed depth-dependent and mantle exhumation at rifted margins. Depth-dependent thinning, in which of lower crust greatly exceeds that upper crust, has been many non-volcanic volcanic margins including conjugate margin pairs. Passive show a paucity brittle during breakup sea-floor spreading initiation. A new model formation developed assumes...
Significance The Iceland hotspot is widely thought to be the surface expression of a deep mantle plume from core–mantle boundary that can traced back in time at least 62 My. However, some lavas contain continental material, which has previously been proposed have recycled through plume. Here, we argue split off sliver continent Greenland Early Eocene. This now located beneath southeast where it locally contaminates plume-derived magmas.
In this contribution, we investigate the role of a mantle plume in genesis Bunbury Basalt using high-precision 40Ar/39Ar geochronology and whole-rock geochemistry, by crustal basement thickness eastern Indian Ocean western Australian continent. The is series lava flows deep intrusive rocks southwestern Australia thought to be earliest igneous products from proto-Kerguelen plume. Nine new plateau ages indicate that erupted three distinct phases, at 136.96±0.43 Ma, 132.71±0.43 Ma 130.45±0.82...
Abstract Rifted margins are commonly defined as magma-poor or magma-rich archetypes based on their morphology. We re-examine the prevailing model inferred from this classification that have excess decompression melting at lithospheric breakup compared with steady-state seafloor spreading, while inhibited melting. investigate magmatic budget related to along two high-resolution long-offset deep reflection seismic profiles across SE Indian (magma-poor) and Uruguayan (magma-rich) rifted...
Abstract The McKenzie model of continental lithosphere extension describes the first-order responses crustal thinning and geothermal gradient increase following rifting, which lead to syn- post-rift basin subsidence. At sub-basin scale, seismic data show fundamental importance major basement faults in controlling geometry subsidence rifted sedimentary basins. Reflection earthquake seismology that these are generally planar extend down 10–15 km mid-crustal level. Below this depth deformation...
Backstripping is a technique employed to analyse the subsidence history of extensional basins, and involves progressive removal sediment loads, incorporating isostatic decompaction responses this unloading. The results backstripping calculations using 1D models employing local (Airy) isostasy 2D "flexural" are compared for three cross-sections North Sea rift basin. commonly used estimate stretching factor (beta ) across basins. At structural highs Airy will overestimate beta by comparison...
The Recôncavo‐Tucano‐Jatobá (RTJ) Rift and many other smaller sedimentary basins in northeast Brazil formed during South Atlantic rifting were subsequently uplifted exhumed so that Albian marine sediments are now located up to 800 m above sea level some 400 km inland from the margin. Local erosion caused by footwall uplift regional erosion, probably resulting magmatic underplating uplift, has removed a large part of thermal sag phase RTJ Rift. flexural cantilever model, incorporating...
This paper describes a method for determining Moho depth, lithosphere thinning factor (γ = 1 − 1/β) and the location of ocean–continent transition at rifted continental margins using 3-D gravity inversion which includes correction large negative thermal anomaly within margin lithosphere. The lateral density changes caused by elevated geotherm in thinned adjacent ocean basin produce significant may be excess −100 mGal, must made order to determine depth accurately from inversion. We describe...
The intraplate deformation of continental lithosphere in response to applied stress has been investigated using a mathematical model which incorporates the elastic, ductile and brittle material. Ductile is assumed be controlled crust by dislocation creep quartz, mantle plasticity olivine. Brittle failure predicted modified Griffith theory. A fundamental feature redistribution within following release both deformation. This produces high levels middle or lower immediately above...
Abstract The mild compressional structures of Cenozoic age on the passive margins bordering Norway, UK, Faroes and Ireland have been subject much discussion in literature. Nevertheless, their origin remains enigmatic. Candidate mechanisms must be able to explain generation sufficient stress cause deformation, episodic nature why they developed where did. We examine these conclude that multiple causes are probable, while favouring body force as potentially most important agent. geometry...