Xavier M. Pellicer

Geological Survey of Ireland

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Mario Zarroca

Universitat Autònoma de Barcelona

Rogelio Linares

Universitat Autònoma de Barcelona

Jeremy C. Ely

University of Sheffield

Xavier Comas

Florida Atlantic University

Carles Roqué i Pau

University of Girona

J. Paul Gibson

Telecom SudParis

Francisco Gutiérrez

Universidad de Zaragoza

Iestyn Barr

Manchester Metropolitan University

Chris D. Clark

University of Sheffield

Domingo Carbonel

Universidad de Zaragoza

Cooperative Institutions

EuroGeoSurveys

University of Sheffield

United States Geological Survey

Durham University

British Geological Survey

Universitat Autònoma de Barcelona

Geological Survey of Ireland

Centre National de la Recherche Scientifique

Natural Environment Research Council

University of Nottingham

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Geohazards in European Geoparks

Xavier M. Pellicer Ahmet Serdar Aytaç Alessia Amorfini Serge Delaby

10.37609/akya.1159

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Electrical methods (VES and ERT) for identifying, mapping and monitoring different saline domains in a coastal plain region (Alt Empordà, Northern Spain)

Journal of Hydrology (2011)

Mario Zarroca Joan Bach i Plaza Rogelio Linares Xavier M. Pellicer

Electrical Resistivity Tomography

10.1016/j.jhydrol.2011.08.052

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Citations (115)

BRITICE Glacial Map, version 2: a map and GIS database of glacial landforms of the last British–Irish Ice Sheet

Boreas (2017)

Chris D. Clark Jeremy C. Ely Sarah L. Greenwood Anna L.C. Hughes Robert T. Meehan

During the last glaciation, most of the British Isles and the surrounding continental shelf were covered by the British–Irish Ice Sheet ( BIIS ). An earlier compilation from the existing literature ( BRITICE version 1) assembled the relevant glacial geomorphological evidence into a freely available GIS geodatabase and map (Clark et al . 2004: Boreas 33, 359). New high‐resolution digital elevation models, of the land and seabed, have become available casting the glacial landform record of the British Isles in a new light and highlighting the shortcomings of the V.1 BRITICE compilation. Here we present a wholesale revision of the evidence, onshore and offshore, to produce BRITICE version 2, which now also includes Ireland. All published geomorphological evidence pertinent to the behaviour of the ice sheet is included, up to the census date of December 2015. The revised GIS database contains over 170 000 geospatially referenced and attributed elements – an eightfold increase in information from the previous version. The compiled data include: drumlins, ribbed moraine, crag‐and‐tails, mega‐scale glacial lineations, glacially streamlined bedrock (grooves, roches moutonnées, whalebacks), glacial erratics, eskers, meltwater channels (subglacial, lateral, proglacial and tunnel valleys), moraines, trimlines, cirques, trough‐mouth fans and evidence defining ice‐dammed lakes. The increased volume of features necessitates different map/database products with varying levels of data generalization, namely: (i) an unfiltered GIS database containing all mapping; (ii) a filtered GIS database, resolving data conflicts and with edits to improve geo‐locational accuracy (available as GIS data and PDF maps); and (iii) a cartographically generalized map to provide an overview of the distribution and types of features at the ice‐sheet scale that can be printed at A0 paper size at a 1:1 250 000 scale. All GIS data, the maps (as PDFs) and a bibliography of all published sources are available for download from: https://www.sheffield.ac.uk/geography/staff/clark_chris/britice .

Meltwater

Glacial landform

Drumlin

Bedrock

Landform

10.1111/bor.12273

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Citations (144)

Eskers in Ireland, Analogs for Mars Landforms

Lunar and Planetary Science Conference (2014)

Xavier M. Pellicer M. C. Bourke

Landform

Source

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ACME, a GIS tool for Automated Cirque Metric Extraction

Geomorphology (2016)

Matteo Spagnolo Ramón Pellitero Iestyn Barr Jeremy C. Ely Xavier M. Pellicer

Cirque

Landform

10.1016/j.geomorph.2016.11.018

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Citations (35)

Characterising the heterogeneous nature of tufa mounds by integrating petrographic, petrophysical, acoustic and electromagnetic measurements

The Depositional Record (2023)

Stefan Schröder Juan Pablo Corella Xavier M. Pellicer P. Rook Alpagut Kara

Abstract Determination of the physical properties of subsurface geological bodies is essential for georesource management and geotechnical applications. In the absence of direct measurements, this usually passes via geophysical methods such as seismic and ground‐penetrating radar. These require conversion to physical properties, and measurements at different scales to test for consistency. This approach is non‐trivial in geobodies with heterogeneous patterns of properties. Tufa mounds—in‐situ terrestrial carbonate buildups precipitating from geothermal waters—are characterised by high contrasts in facies and petrophysical properties from microscale to macroscale, and are therefore ideally suited to test the ability of non‐invasive geophysical methods to estimate such contrasts, and to develop petrophysical models based on geophysical properties. Here, a laboratory‐based study of a Pleistocene tufa mound in Spain is presented that combines (1) petrography, (2) digital 2D pore network analysis, (3) gas porosity and permeability measurements, (4) acoustic velocity measurements and (5) electromagnetic wave velocity and porosity determination from ground‐penetrating radar, to develop empirical petrophysical models. These results show the consistency of petrophysical properties determined with different methods across various observational scales. Electromagnetically derived porosity positively correlates with gas porosity. Petrophysical properties depend on measurable rock fabric parameters and the degree of cementation, which provide predictive tools for subsurface geobodies. Strongly cemented peloidal‐thrombolitic fabrics with intergranular and intercrystalline pores, and a dominance of small complex pores best transmit acoustic waves. Weak cementation and a significant fraction of large simple pores (framework, vegetation moulds) increase porosity and permeability of shrubby fabrics, while causing lower acoustic velocity. This study demonstrates that ground‐penetrating radar models can be used in combination with direct measurements of physical subsurface properties to capture highly contrasting physical properties associated with different sedimentary facies that would not be achievable with other methods, thus improving the understanding of formational processes.

Petrophysics

Tufa

Cementation (geology)

Microscale chemistry

Ground-Penetrating Radar

10.1002/dep2.259

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Suflé. Una proposta de plats lleugers, dolços o salats, que requereix una precisió de rellotger, però que deixa via lliure a la imaginació per combinar ingredients.

Montse Virgili Xavier M. Pellicer

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Construction of an evolutionary deglaciation model for the Irish midlands based on the integration of morphostratigraphic and geophysical data analyses

Journal of Quaternary Science (2012)

Xavier M. Pellicer William P. Warren J. Paul Gibson Rogelio Linares

Abstract Alternative, established models for the deglaciation of the midlands of Ireland are tested against an interpretation of a suite of deglacial sediments covering an area of 600 km 2 in the east central midland area. Interpretation of the sediments is based on geomorphological mapping, lithostratigraphic characterization of exposures and geotechnical data supported by electrical resistivity tomography (ERT) and ground penetrating radar (GPR). GPR depicted small‐scale sedimentological and deformational structures within low‐conductivity soft sediments, such as cross‐bedding, planar bedding, channel‐like features and faulting planes, and revealed the internal architecture of eskers, glaciodeltas, subaqueous fans and raised bogs. ERT data permitted the detection of depth to bedrock and the lithological characterization of unconsolidated sediments. The ten sites presented were surveyed by traditional mapping methods and/or geophysical techniques. This allowed the construction of a local model of the deglaciation of the area which recognized five main stages. An ice sheet covering most of Ireland withdrew as a single body as far as the midlands. At this stage, two main directions of ice retreat are identified from the spatial distribution of meltwater/overflow channels, esker and morainic ridges, and ice‐marginal glaciolacustrine deposits. A pattern of deglacial sedimentation into an expanding ice‐marginal glacial lake is depicted. The glacial lake was dammed to the west by two ice dome fronts, one decaying to the north‐west and another to the south‐west, and by the Shannon Basin watershed to the east. Glacial lake outlets identified along the watershed and the altitude of the topset/foreset interface zone depicted in glaciodeltaic deposits allowed the identification of three lake water levels. The highest level is at 87–89 m Ordnance Datum (OD), the second lake level at 84 m OD and the third at 78 m OD. Copyright © 2012 John Wiley & Sons, Ltd.

Deglaciation

Bedrock

Electrical Resistivity Tomography

Ground-Penetrating Radar

Meltwater

10.1002/jqs.2570

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Citations (13)

Manual mapping of drumlins in synthetic landscapes to assess operator effectiveness

Journal of Maps (2014)

John K. Hillier Mike J. Smith R. Armugam Iestyn Barr Clare M. Boston

Mapped topographic features are important for understanding processes that sculpt the Earth's surface. This paper presents maps that are the primary product of an exercise that brought together 27 researchers with an interest in landform mapping wherein the efficacy and causes of variation in mapping were tested using novel synthetic DEMs containing drumlins. The variation between interpreters (e.g. mapping philosophy, experience) and across the study region (e.g. woodland prevalence) opens these factors up to assessment. A priori known answers in the synthetics increase the number and strength of conclusions that may be drawn with respect to a traditional comparative study. Initial results suggest that overall detection rates are relatively low (34–40%), but reliability of mapping is higher (72–86%). The maps form a reference dataset.

Landform

Drumlin

Variation (astronomy)

Equifinality

10.1080/17445647.2014.957251

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Citations (40)

Geophysical Characterisation andEvolutionary Model of the Quaternary sedimentsin the North Offaly region of Central Ireland

Xavier M. Pellicer

Data from field mapping of 133 exposures, 57 boreholes and 190 petrographic and particle size analysis samples were used to produce Quaternary geological and depth to bedrock maps for the 600 Km² research area located in the North Offaly region of central Ireland. Based on the mapping, the area was subdivided into four physiographic units with specific landscape characteristics, namely: Shannon Basin esker-dominated landscape; Shannon - East Basin watershed area; East Basin and the Brosna River Basin. The capabilities of geophysical techniques were tested as Quaternary sediments mapping tools and the geophysical results obtained, combined with field mapping, were used in the production of an evolutionary model of deglaciation. The geophysical methods employed were Electrical Resistivity Tomography (ERT), time-lapse resistivity imaging, azimuthal resistivity, Ground Penetrating Radar (GPR) and Very Low Frequency (VLF). Forward modelling with GPRSIM and RES2DMOD software and geophysical ground truth evaluation in three test sites aided in the selection of the most efficient data collection, processing and interpretation methods, evaluation of the potential and limitations of the techniques and inversion models and yielded a better interpretation of the geophysical data. Seventeen sites were geophysically surveyed in association with borehole and exposure data where available. GPR proved to be an excellent technique for the classification and characterisation of sedimentological and deformational structures within low conductivity soft sediments, expressed as esker and morainic ridges, glaciodeltas, sub-aqueous fans or raised bog. A centre antenna frequency of 200MHz gave a better spatial resolution that 100MHz but a lower penetration and also took longer to collect the data. Amplitude analysis of 2D GPR data assisted in the lithological classification of these sediments. ERT data permitted accurate depth to bedrock detection and lithological classification of soft sediments. ERT and GPR data combined yielded the best results. Monthly time-lapse resistivity showed that effective recharge, lithology and depth influenced the observed variation in resistivity. Geophysical data and field mapping suggest that a glacial lake expanded westwards, confined to the east by the Shannon Basin watershed and to the west by two ice-sheets, one retreating northwest and the other south-southwest.

Ground-Penetrating Radar

Electrical Resistivity Tomography

Bedrock

Seismic refraction

Geotechnical investigation

Geophysical survey

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