Paul D. Bons
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View article: Folding due to anisotropy in ice, from drill-core-scale cloudy bands to km-scale internal reflection horizons
Folding due to anisotropy in ice, from drill-core-scale cloudy bands to km-scale internal reflection horizons Open
Upright folds in ice sheets are observed on the cm scale in cloudy bands in drill cores and on the km scale in radargrams. We address the question of the folding mechanism for these folds by analysing the power spectra of fold trains to ob…
View article: Linking crystallographic orientation and ice stream dynamics: evidence from the EastGRIP ice core
Linking crystallographic orientation and ice stream dynamics: evidence from the EastGRIP ice core Open
A better understanding of glacial ice flow and how it is influenced by internal deformation is required to improve the projections of future sea level rise under a warming climate. Large ice streams, the main contributors to solid-ice disc…
View article: Predicting the Three‐Dimensional Stratigraphy of an Ice Rise
Predicting the Three‐Dimensional Stratigraphy of an Ice Rise Open
Ice rises located in ice shelves around Antarctica act as pinning points, impeding the flow of ice in ice shelves and in the upstream ice sheet. Ice rises preserve records of past climate and associated changes in ice flow in their stratig…
View article: Age–depth distribution in western Dronning Maud Land, East Antarctica, and Antarctic-wide comparisons of internal reflection horizons
Age–depth distribution in western Dronning Maud Land, East Antarctica, and Antarctic-wide comparisons of internal reflection horizons Open
Radio-echo sounding provides the opportunity to study the internal architecture of ice sheets through imaging stratified englacial reflections, known as internal reflection horizons (IRHs). They represent consistent time horizons formed at…
View article: How to make an ice stream
How to make an ice stream Open
Fast-flowing ice streams drain most of the inland ice from the Antarctic and Greenland ice sheets. Despite their critical role, the formation mechanisms of ice streams and their shear margins remain controversial. We present a three-dimens…
View article: Granitoid Metasomatism and Giant Quartz Vein Formation by Mineral Replacement: Insights from the Canigó Massif, Eastern Pyrenees
Granitoid Metasomatism and Giant Quartz Vein Formation by Mineral Replacement: Insights from the Canigó Massif, Eastern Pyrenees Open
Metasomatism is a ubiquitous process in the Earth’s crust, exerting major controls on fluid, heat and mass transfer and rock deformation, and is commonly constituted by mineral replacement reactions. Different types of metasomatism may coe…
View article: Stylolites in Carbonate Rocks: Morphological Variability According to the Host Rock Texture
Stylolites in Carbonate Rocks: Morphological Variability According to the Host Rock Texture Open
Stylolites are ubiquitous structures in carbonates that present a variety of morphologies. Besides being important structures in terms of rock compaction and deformation, stylolites control limestone permeability, which is influenced by th…
View article: Folding due to anisotropy in ice, from drill core-scale cloudy bands to km-scale internal reflection horizons
Folding due to anisotropy in ice, from drill core-scale cloudy bands to km-scale internal reflection horizons Open
Upright folds in ice sheets are observed on the cm-scale in cloudy bands in drill cores and on the km-scale in radargrams. We address the question of the folding mechanism for these folds, by analysing the power spectra of fold trains to o…
View article: A review of the granite concept through time
A review of the granite concept through time Open
Granitic rocks are ubiquitous worldwide in ancient and active tectonic settings, representing powerful sources of information about the Earth's past and present geodynamic behaviour. Numerous recent milestones fostering our knowledge of gr…
View article: Investigating the dynamic history of a promontory ice rise using radar data
Investigating the dynamic history of a promontory ice rise using radar data Open
Ice rises hold valuable records revealing the ice dynamics and climatic history of Antarctic coastal areas from the Last Glacial Maximum to today. This history is often reconstructed from isochrone radar stratigraphy and simulations focusi…
View article: EastGRIP ice core reveals the exceptional evolution of crystallographic preferred orientation throughout the Northeast Greenland Ice Stream
EastGRIP ice core reveals the exceptional evolution of crystallographic preferred orientation throughout the Northeast Greenland Ice Stream Open
A better understanding of glacial ice flow and how it is influenced by internal deformation is required to improve the projections of future sea-level rise in a warming climate. Especially large ice streams, the main contributors to solid …
View article: Age-depth distribution in western Dronning Maud Land, East Antarctica, from three decades of radar surveys
Age-depth distribution in western Dronning Maud Land, East Antarctica, from three decades of radar surveys Open
Radio-echo sounding provides the opportunity to study the internal architecture of ice sheets through imaging stratified englacial reflections, known as internal reflection horizons (IRHs). They represent consistent time horizons formed at…
View article: Dynamic Recrystallization of Olivine During Simple Shear: Evolution of Microstructure and Crystallographic Preferred Orientation From Full‐Field Numerical Simulations
Dynamic Recrystallization of Olivine During Simple Shear: Evolution of Microstructure and Crystallographic Preferred Orientation From Full‐Field Numerical Simulations Open
Upper mantle deformation is mainly controlled by the mechanical behavior of olivine. Crystallographic preferred orientations (CPOs) develop in olivine due to crystal‐plastic deformation during mantle flow, where the a‐axes of olivine polyc…
View article: Formation Mechanisms of Large‐Scale Folding in Greenland's Ice Sheet
Formation Mechanisms of Large‐Scale Folding in Greenland's Ice Sheet Open
Radio‐echo sounding (RES) shows large‐scale englacial stratigraphic folds are ubiquitous in Greenland's ice sheet. However, there is no consensus yet on how these folds form. Here, we use the full‐Stokes code Underworld2 to simulate ice mo…
View article: Investigating the Dynamic History of a Promontory Ice Rise using Radar Data
Investigating the Dynamic History of a Promontory Ice Rise using Radar Data Open
Ice rises hold valuable records revealing the ice dynamics and climatic history of Antarctic coastal areas from the Last Glacial Maximum to today. This history is often reconstructed from isochrone radar stratigraphy and simulations focusi…
View article: Sediment Freeze‐On and Transport Near the Onset of a Fast‐Flowing Glacier in East Antarctica
Sediment Freeze‐On and Transport Near the Onset of a Fast‐Flowing Glacier in East Antarctica Open
Understanding the material properties and physical conditions of basal ice is crucial for a comprehensive understanding of Antarctic ice‐sheet dynamics. Yet, direct data are sparse and difficult to acquire. Here, we employ ultra‐wideband r…
View article: Folded ice in the upper North East Greenland Ice Stream reveal timing of the onset of streaming
Folded ice in the upper North East Greenland Ice Stream reveal timing of the onset of streaming Open
Only a few localised ice streams drain most ice from the Greenland Ice Sheet. Thus, understanding ice stream behaviour and their temporal variability is crucially important to predict future sea-level change. The interior trunk of the 700 …
View article: Late Cretaceous reactivation of a Paleo-Tethyan suture zone in Xizang of western China: extensional collapse of the proto-Tibetan plateau?
Late Cretaceous reactivation of a Paleo-Tethyan suture zone in Xizang of western China: extensional collapse of the proto-Tibetan plateau? Open
The deformation of the Himalaya-Tibetan plateau remains one of the hottest examples of Earth's tectonics and dynamic evolution. What drives deformation and growth of the plateau, and how this is partitioned into diverse structural styles a…
View article: Duplex Structures in the EastGRIP Ice Core - the Loss of Stratigraphic Integrity
Duplex Structures in the EastGRIP Ice Core - the Loss of Stratigraphic Integrity Open
The EastGRIP ice core is drilled through the Northeast Greenland Ice Stream, which has a surface velocity of 55 m/yr towards NNE at the drill site. Deriving a better understanding of internal deformation and the rheology within an ice…
View article: A structural geologist's view on the Northeast Greenland Ice Stream
A structural geologist's view on the Northeast Greenland Ice Stream Open
The Northeast Greenland Ice Stream (NEGIS) is a fascinating, over 500 km long structure in the Greenland Ice Sheet. The ice stream shows many features, such as folds and shear zones, that are also common in other ductile rocks. Geological …
View article: Deformation and recrystallization inside the Northeast Greenland Ice Stream – findings from microstructural analysis of the EastGRIP ice core
Deformation and recrystallization inside the Northeast Greenland Ice Stream – findings from microstructural analysis of the EastGRIP ice core Open
Solid ice discharge from land-based ice masses into the ocean raises the global sea level and accelerates due to anthropogenic climate change. Modelling ice flow dynamics aims to provide better projections of future sea level rise. The Ant…
View article: Dynamic recrystallization of olivine during simple shear: evolution of microstructure and crystallographic preferred orientation from full-field numerical simulations
Dynamic recrystallization of olivine during simple shear: evolution of microstructure and crystallographic preferred orientation from full-field numerical simulations Open
The deformation of the upper mantle is predominantly governed by the mechanical behavior of olivine (Karato et al., 1989). During mantle flow, olivine undergoes crystal-plastic deformation, leading to the development of crystallographic pr…
View article: How ice anisotropy contributes to fold and ice stream in large-scale ice-sheet models
How ice anisotropy contributes to fold and ice stream in large-scale ice-sheet models Open
Satellite and airborne sensors have provided detailed data on ice surface flow velocities, englacial structures of ice sheets and bedrock elevations. These data give insight into the flow behaviour of ice sheets and glaciers. One significa…