Enrique Gomez‐Rivas

Universitat de Barcelona

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Paul D. Bons

University of Tübingen

Albert Griera

Universitat Autònoma de Barcelona

Mária-Gema Llorens

Geociencias Barcelona

Juan Diego Martín‐Martín

Universitat de Barcelona

Anna Travé

Universitat de Barcelona

Ricardo A. Lebensohn

Los Alamos National Laboratory

Eloi González-Esvertit

Universitat de Barcelona

Tamara de Riese

University of Tübingen

Daniel Koehn

Friedrich-Alexander-Universität Erlangen-Nürnberg

Ilka Weikusat

University of Tübingen

Cooperative Institutions

Universitat de Barcelona

Centre National de la Recherche Scientifique

Geociencias Barcelona

University of Tübingen

Universitat Autònoma de Barcelona

University of Aberdeen

China University of Geosciences (Beijing)

Consejo Superior de Investigaciones Científicas

RWTH Aachen University

University of Liverpool

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Geology of giant quartz veins and their host rocks from the Eastern Pyrenees (Southwest Europe)

Journal of Maps (2022)

Eloi González-Esvertit Àngels Canals Paul D. Bons Henrique Murta Josep Maria Casas

Giant Quartz Veins (GQVs) are ubiquitous in different tectonic settings and, besides being often related to hydrothermal ore deposits, also represent large-scale fingerprints of the structural and geochemical history of the rocks in which they are hosted. Here we present detailed geological maps and interpretations of three key areas of the Eastern Pyrenees where GQVs are well exposed. The studied rocks record different styles of deformation and are representative of common settings of the Pyrenees where GQVs are present: pre-Variscan metasedimentary and metavolcanic rocks, late Variscan granitoids, and Mesozoic and Cenozoic sedimentary rocks. GQVs in the study areas formed along pre-existing brittle and ductile structures or at locations with lithological heterogeneities, and have alteration haloes of silicified host rocks. The geological maps and interpretations presented here contribute to gain insights into the formation mechanisms of GQVs and into the structural constraints on fluid flow and mineral reactions at different depths of the Earth's crust.

10.1080/17445647.2022.2133642

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Citations (7)

Fluvial sedimentation and its reservoir potential at foreland basin margins: A case study of the Puig-reig anticline (South-eastern Pyrenees)

EarthArXiv (California Digital Library) (2021)

Xiaolong Sun Juan Alcalde Enrique Gomez‐Rivas A. S. Owen Albert Griera

Fluvial fans represent one of the dominant sedimentary systems at the active margins of non-marine foreland basins. The Puig-reig anticline at the north-eastern margin of the Ebro Foreland Basin (SE Pyrenees, Spain) exposes continuous outcrops of late Eocene-early Oligocene fluvial deposits, from proximal to medial fluvial fan environments. The proximal deposits, located in the northern limb of the anticline, especially in the northwest zone, are characterised by conglomerates with minor interbedded sandstones, which present thick and wide sheet-like geometries with unscoured or scoured basal surfaces. These are interpreted to be the deposits of unconfined flash floods and wide-shallow channel streams. The medial deposits, covering the rest of the anticline, consist of interbedded beds of conglomerates, sandstones and claystones, deposited from braided channel streams and overbanks. Distal deposits are found towards the south, beyond the anticline, and are characterised by sandstone and clay deposits of terminal lobes or lacustrine deltas and interdistributary bays. This study assesses the impact of the primary depositional characteristics, diagenesis and deformation of the most heterolithic portion of the system, with implications for the understanding of folded fluvial reservoirs. Diagenetic processes, mainly mechanical compaction and calcite cementation, resulted in overall low matrix porosity, with limited relatively higher porosity developed in sandstone lithofacies in the medial deposits. Deformation associated with thrusting and fold growth resulted in the formation of abundant fractures, with relatively higher fracture intensities observed in sandstone lithofacies in the anticline crest. This study shows that post depositional processes can both improve and diminish the reservoir potential of basin proximal fluvial deposits, by the development of open fracture networks and by compaction-cementation, respectively. The comparison of the Puig-reig anticline with other similar settings worldwide shows that foreland basin margin locations can be potential areas for effective reservoirs, even in the case of low matrix porosity.

Anticline

Syncline

Arenite

Outcrop

10.31223/x5bg9r

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Relationship between stylolite morphology and the sealing potential of stylolite-bearing carbonate cap rocks

Geological Society of America Bulletin (2022)

Jun Wu Tailiang Fan Enrique Gomez‐Rivas Qian Cao Anna Travé

Abstract We analyzed the sealing effectiveness of cap rocks bearing different types of stylolites using a combination of petrographic, petrophysical, pore structure, and sealing capacity characterization techniques. This study was based on examples of carbonate cap rocks that seal ultradeep hydrocarbon reservoirs of the Tarim Basin (China). Samples from both drill cores and their outcrop analogues were investigated to quantify how morphology influences the sealing capacity of different types of stylolite-bearing rocks. The study cap rocks consisted of mudstone, wackestone to packstone, grainstone, and dolomitic limestone. Four types of stylolites were identified: rectangular layer, seismogram pinning, suture and sharp peak, and simple wave-like types. The difference in the sealing capacity of carbonate cap rocks is attributed to their pore structure connections and the types of stylolites they develop. Samples bearing simple wave-like stylolites showed the best sealing capacity, followed by those with rectangular layer and suture and sharp peak types, whereas carbonates hosting seismogram pinning types had the lowest sealing capacity. The impact of stylolite segments on the rock sealing properties, however, differed from one segment to another. Rectangular layer–type stylolites could be divided into three distinct segments (with good, moderate, and poor sealing, respectively). Both the seismogram pinning and suture and sharp peak stylolite types were divided in two parts, with the former one having moderate and poor sealing and the latter exhibiting good and moderate sealing. The simple wavelike type had a good sealing capacity all along the pressure-solution seam. The most effective sealing barriers for vertical fluid flow form when (1) calcite and siliceous cements are pervasively distributed in the vicinity of stylolites, forming highly cemented zones with lower porosity and permeability than their surrounding host rocks; (2) stylolites are enriched in insoluble residues; and (3) rare microfractures and dissolution vugs are found along the stylolites. This work provides useful examples for the prediction of the sealing potential of stylolite-bearing carbonate rocks according to stylolite morphology in other geologic settings.

Stylolite

10.1130/b36297.1

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Citations (9)

Full-field numerical simulations of temperate ice viscoplastic deformation and dynamic recrystallization [Data set]

Zenodo (CERN European Organization for Nuclear Research) (2020)

Mária-Gema Llorens Albert Griera Paul D. Bons Enrique Gomez‐Rivas Ilka Weikusat

This data set corresponds to the scientific article Llorens, M.-G., Griera, A., Bons, P.D., Gomez-Rivas, E., Weikusat, I., Prior, D., Kerch, J. and Lebensohn, R.A. Seismic anisotropy of temperate ice in polar ice sheets. Journal of Geophysical Research: Earth Surface. This data set contains (i) the output files with the crystal orientation and phase data of each simulation presented in the article (run using the open-source software platform ELLE; Bons et al., 2008; Piazolo et al., 2019), and (ii) a code to plot the crystallographic orientation density function (ODF) using the open-source code MTEX (Mainprice et al., 2015). For the visualization of seismic wave velocities the information contained in these output files can be loaded (in radians) to the software package AEH-EBSD Analysis Toolbox (Naus-Thijseen, 2011; Vel et al., 2016). The output files are provided for time steps 50 (shear strain of 1), 100 (shear strain of 2), 200 (shear strain of 4), 300 (shear strain of 6) and 400 (shear strain of 8). Each file has eight columns and multiple rows. Each row stores the output data for an unode of the model, and the model has 256x256 unodes. The first three columns correspond to the three Euler angles (α, β, γ) in degrees, the fourth and fifth column are the x and y coordinates of each unode, the sixth and seventh columns contain attributes not used in these simulations and column eight shows the phase number corresponding to each unode (1 for solid ice and 2 for water). Three simulations are presented and analyzed in this article, and thus their results stored in this data set: Simulation 1: purely solid ice (melt fraction ϕ=0) Simulation 2: ice including 5% water (melt fraction ϕ=5) Simulation 3: ice including 15% water (melt fraction ϕ=15)

Recrystallization (geology)

Viscoplasticity

Dynamic Recrystallization

10.5281/zenodo.4028549

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From hot to cold - The temperature dependence on rock deformation processes: An introduction

Journal of Structural Geology (2020)

Enrique Gomez‐Rivas Robert W. Butler David Healy G.I. Alsop

Deformation mechanism

Earth materials

10.1016/j.jsg.2020.103977

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Citations (19)

The Upper Aptian to Lower Albian syn-rift carbonate succession of the southern Maestrat Basin (Spain): Facies architecture and fault-controlled stratabound dolostones

Cretaceous Research (2013)

Juan Diego Martín‐Martín Enrique Gomez‐Rivas Telm Bover‐Arnal Anna Travé R. Salas

Dolomitization

Aptian

Siliciclastic

Dolostone

Carbonate platform

Fault block

Basement

Alluvial fan

10.1016/j.cretres.2012.12.008

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Citations (51)

Textural and chemical evolution during dedolomitization: A case study of the Benassal Formation, Maestrat Basin, Spain

Marine and Petroleum Geology (2023)

Stephen Centrella Nicolas Beaudoin Cynthia Trebucq Guilhem Hoareau Enrique Gomez‐Rivas

Dolomitization

10.1016/j.marpetgeo.2023.106290

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Citations (4)

Fracture network evaluation program (FraNEP): A software for analyzing 2D fracture trace-line maps

Computers & Geosciences (2013)

Conny Zeeb Enrique Gomez‐Rivas Paul D. Bons Simon Virgo Philipp Blum

Lineament

Scan line

Line (geometry)

10.1016/j.cageo.2013.04.027

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Citations (46)

Effects of fluvial sedimentary heterogeneity on CO2 geological storage: Integrating storage capacity, injectivity, distribution and CO2 phases

Journal of Hydrology (2022)

Xiaolong Sun Yingchang Cao Keyu Liu Juan Alcalde Patricia Cabello

Caprock

Storage efficiency

10.1016/j.jhydrol.2022.128936

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Citations (15)

Temporal and spatial variations in calcium carbonate deposition in a mixed siliciclastic–carbonate deep marine system: the Ediacaran Deeside Limestone Formation, Aboyne, Scotland

Scottish Journal of Geology (2022)

Stephen J. Drake Enrique Gomez‐Rivas Ryan B. Ickert David I. M. Macdonald

The Deeside Limestone Formation (DLF), outcropping in western Aberdeenshire, comprises the eastern margin of a distinctive Upper Dalradian mixed siliciclastic–carbonate system of Ediacaran age which may be correlated southwestwards for more than 400 km to County Donegal in Ireland. A reconstructed stratigraphic column suggests three broad vertical sequences (S1–S3), each comprising a general upward proportionate increase in calcium carbonate with respect to quartz, locally capped by metalimestones (L1–L3). A simple explanation for this upward change lies in the differing physical response of the two heterolithic components under the same hydrodynamic process, with the heavier quartz grains preferentially enriching the bedload and the finer carbonate mud fraction, the suspended load. The three metalimestone intervals are observed only in central/eastern parts of the field area, suggesting a lateral facies variation. The predominance of calcareous–siliciclastic bed-scale compositional mixing within the DLF suggests sedimentation on the Dalradian shelf comprised contemporaneous mixing of the siliciclastic and carbonate fractions prior to subsequent re-mixing during transportation downslope into the deep water, punctuated by pulses of point-sourced siliciclastic input.

Siliciclastic

Dalradian

Outcrop

10.1144/sjg2021-017

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