Braucher Regis
@cerege.fr
CEREGE CNRS
RESEARCH, TEACHING, or OTHER INTERESTS
Earth and Planetary Sciences, Geochemistry and Petrology
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Jean‐Jacques Delannoy, Anita Quiles, Julien Jacquet, Mike Allison, Régis Braucher, Laetitia Léanni, Emmanuel Malet, Jeremy Ash, Johan Berthet, Angela Clyburn,et al.
Wiley
ABSTRACTNew research is being conducted at the Chuchuwayha sacred site (British Columbia, Canada) at the request of the Upper Similkameen Indian Band, who want to pass on the site's history to future generations. The project's aims were to determine when this site in the glacial Similkameen Valley became accessible to human communities, to reconstruct the formation of the surrounding landscape, and to describe the rock shelter's evolution during the period of human frequentation (rock art). To this end, we combined geomorphological, archaeometric, and geochemical (cosmogenic dating) data to construct a robust chronological framework for the site's evolution and human occupations. Results showed that the Similkameen Valley became ice‐free 18,000 years ago, that the site's morphology was shaped by postglacial processes, and that its general topography had formed around 7000 years ago. The site's morphology—a rock shelter behind a mound of rockfall boulders—created a trap for eolian and autochthonous sediments, which have preserved a record of human occupations. Our multidisciplinary approach also enabled us to determine age ranges for the shelter's paintings, to draw up a new time frame for human occupations of the site, which lies on a traditional Syilx trail, and to relate these occupations to changes in the surrounding landscape.
Vincent Jomelli, Patrick Wagnon, Joanna Charton, Régis Braucher, Leo Martin, Irene Schimmelpfennig, Didier Swingedouw, Deborah Verfaillie, Fanny Brun, Stephanie Gairoard,et al.
Elsevier BV
Marc Calvet, Yanni Gunnell, Magali Delmas, Régis Braucher, Stéphane Jaillet, Philipp Häuselmann, Romain Delunel, Patrick Sorriaux, Pierre G. Valla, and Philippe Audra
Elsevier BV
Matěj Roman, Daniel Nývlt, Bethan J. Davies, Régis Braucher, Stephen J.A. Jennings, Michal Břežný, Neil F. Glasser, Michael J. Hambrey, Juan M. Lirio, and Ángel Rodés
Elsevier BV
Kishan Aherwar, Michal Šujan, Alessandro Amorosi, Bruno Campo, Andrej Chyba, Adam Tomašových, Barbara Rózsová, Aster Team, and Régis Braucher
Elsevier BV
Mohammad Tauseef, Ingo Leya, Jérôme Gattacceca, Beda Hofmann, Sönke Szidat, Régis Braucher, and
Wiley
AbstractWe perform a systematic and detailed study of the 14C and 14C‐10Be dating systems for meteorite terrestrial ages. Physical model calculations indicate that neither the 14C production rates nor the 14C/10Be production rate ratios are constant enough to be reasonably approximated by average values. By using simple averages, one introduces a significant size‐dependent bias into the database for meteorite terrestrial ages. By combining modeled 14C production rates and 14C/10Be production rate ratios with (22Ne/21Ne)cos ratios and assuming ~80% ablation losses, relatively easy to use correlations of 14C production rates and 14C/10Be production rate ratios as a function of (22Ne/21Ne)cos are established. The new correlations enable the determination of terrestrial ages that are more accurate than ages based solely on average values for 14C and/or 14C/10Be. We validate the model predictions by measuring 14C activity concentrations, 14C/10Be production rate ratios, 21Necos concentrations, and (22Ne/21Ne)cos ratios in four recently fallen meteorites: Mt. Tazerzait, Boumdeid (2011), Bensour, and SaU 606. The experimental data confirmed the model predictions, although the available data are insufficient to be conclusive. More data from freshly fallen meteorites are needed for validating the model predictions for different chondrite sizes and chondrite types.
Audrey Taillefer, Laurent Truche, Laurence Audin, Frédéric‐Victor Donzé, Delphine Tisserand, Simona Denti, Nelida Manrique Llerena, Pablo Jorge Masías Alvarez, Régis Braucher, Swann Zerathe,et al.
American Geophysical Union (AGU)
AbstractThis study provides a comprehensive characterization of various hydrothermal systems in Southern Peru ranging from the faulted Precordillera's steep topography up to the volcanic High Cordillera (>4,000 m asl). The objective is to investigate thermal anomalies that may potentially serve as new geothermal resources. Our integrated approach combines: (a) geochemistry from 14 hot springs sampled throughout the Tacna region, and (b) 3D numerical modeling of coupled groundwater and heat transfer considering topography and faults embedded in homogeneous permeability. Water and gas analysis indicates that the springs located near volcanoes discharge Na‐K‐Cl waters with high temperatures (>87°C), high Total Dissolved Solid concentrations (TDS >3,452 mg/L), and free gases dominated by CO2 (>90 vol%). Springs located along the regional faults in the Precordillera discharge Ca‐SO4 and Na‐K‐Cl waters with moderate temperatures (27–53°C), intermediate TDS concentrations (464–2,458 mg/L), radiocarbon ages between 1.4 and 7.9 kyr, and free gases dominated by N2 (>95 vol%). The Aruma springs, which are located at the transition between the High and the Precordillera, display intermediate characteristics. Numerical models accurately replicate the locations and temperatures of the fault‐related springs only for permeable faults (>10−14 m2), revealing the creation of 100‐km long thermal plumes along faults, locally rising up the 150°C‐isotherm to about ∼1,000 m below the surface. This approach clearly distinguishes the spring origins, which are volcanic in High Cordillera and tectonic in Precordillera. Moreover, we highlight that steep topographic gradient and permeable reverse faults in the Andean forearc may generate considerable thermal anomalies, opening perspectives for the geothermal exploration.
Michal Šujan, Kishan Aherwar, Rastislav Vojtko, Régis Braucher, Katarína Šarinová, Andrej Chyba, Jozef Hók, Anita Grizelj, Radovan Pipík, Bronislava Lalinská-Voleková,et al.
Elsevier BV
Timothée Jautzy, Gilles Rixhon, Régis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, and Aster Team
Elsevier BV
Michal Šujan, Kishan Aherwar, Andrej Chyba, Barbara Rózsová, Régis Braucher, Martin Šujan, František Šipka, and Aster Team
Central Library of the Slovak Academy of Sciences
Successions deposited under rifting and post-rift settings of an isolated epicontinental basin often exhibit contrasting characteristics. Facies linked to transgression during basin rifting are typically locally sourced fan deltas transporting coarse-grained sediment, whereas the post-rift setup generally involves a normal regression marked by more extensive catchments, sediment sourced from greater distances, and an overall decrease in average grain size compared to the transgressive facies. In this study, we present a specific scenario based on a sedimentological, stratigraphic, and authigenic 10Be/9Be analysis of the Nemčiňany Formation, an Upper Miocene fan deltaic succession in the eastern Danube Basin, Slovakia. Deposition of the Nemčiňany Fm. was initiated shortly after ~11.6 Ma by the fourth rifting phase of the Pannonian Basin System, triggering the transgression of Lake Pannon. The depositional system persisted until ~9.6 Ma, likely balancing the increased accommodation rate with sediment supply in the shallow lake area situated on a basement high. Subsequently, a relative decrease in the accommodation rate prompted the progradation of shelf-slope scale clinoforms, originating from the Nemčiňany depositional system, toward the center of the Komjatice depression at ~9.4 Ma, resulting in a normal regression of Lake Pannon. The persistence of the Nemčiňany fan delta system, unlike common stratigraphic patterns, was associated to the high sediment supply yielded by the paleo-Hron river, which entered the basin in the study area. These observations underscore the need for caution in predicting provenance shifts during changes in geodynamic stages of a basin.
Arthur Ancrenaz, Stéphane Pochat, Emmanuelle Defive, Alexandre Poiraud, Régis Braucher, Vincent Rinterknecht, and Johannes Steiger
Elsevier BV
Michal Šujan, Kishan Aherwar, Rastislav Vojtko, Régis Braucher, Katarína Šarinová, Andrej Chyba, Jozef Hók, Anita Grizelj, Radovan Pipík, Bronislava Lalinská-Voleková,et al.
Elsevier BV
Zdeněk Máčka, Régis Braucher, Piotr Migoń, Oľga Belova, Jaromír Leichmann, G. Aumaître, D. Bourlès, and K. Keddadouche
Elsevier BV
Jan Lenart, Martin Kašing, Tomáš Pánek, Régis Braucher, and František Kuda
Springer Science and Business Media LLC
Abstract Despite significant progress in understanding the stability of rock slopes, little is known about the time scales of the evolution of slow-moving rockslides. The Ledové sluje rockslide in the Thaya River canyon is a unique and infrequent slope failure developed in crystalline rocks of the Variscan orogen in Central Europe. Fresh topography with trenches, rock walls, slided blocks, scree slopes and crevice-type caves has attracted generations of geologists for more than a century, but questions of mechanism and age of the rockslide have remained unresolved. To address this question, we combined geomorphological research with detailed analysis of the geological structure, electrical resistivity profiling and terrestrial cosmogenic nuclide dating (TCN). Our data show that failure developed above the river undercut bank along a planar sliding surface predisposed by NW-oriented gently dipping metamorphic foliation intersected by steep fractures and faults. Although TCN dating does not allow determination of the entire life span of the rockslide, its scarp predisposed by NE- to ENE-striking fault was largely exposed in the Last Glacial during marine isotope stages (MIS) 3 and 2 between ~ 43 and 23 ka, suggesting slow gradual or multievent movement of the rockslide slope rather than a single catastrophic event. We conclude that, although very rare in Central Europe, rockslides in the crystalline rocks of the Palaeozoic orogens may leave a much longer topographic footprint than in the adjacent Alpine mountain belts.
Rosa M. Carrasco, Valentí Turu, Rodrigo L. Soteres, Javier Fernández-Lozano, Theodoros Karampaglidis, Ángel Rodés, Xavier Ros, Nuria Andrés, José Luis Granja-Bruña, Alfonso Muñoz-Martín,et al.
Elsevier BV
Tereza Dlabáčková, Zbyněk Engel, Tomáš Uxa, Régis Braucher, and Aster Team
Elsevier BV
Vincent Jomelli, Patrick Wagnon, Didier Swingedouw, Joanna Charton, Régis Braucher, Adèle Hue, Fanny Brun, Christophe Colin, Stephanie Gairoard, Dibas Shrestha,et al.
Elsevier BV
Michal Šujan, Régis Braucher, Andrej Chyba, Martin Vlačiky, Kishan Aherwar, Barbara Rózsová, Klement Fordinál, Juraj Maglay, Alexander Nagy, Martina Moravcová,et al.
Wiley
ABSTRACTThis study examines the suitability of the authigenic 10Be/9Be dating method to the dating of the deposits of an incising river, taking as an example the Nová Vieska river terrace, which accumulated during the neotectonic inversion of the Danube Basin (western Slovakia). The succession was formed by a wandering river with minor preservation of proximal floodplain muds. The frequent occurrence of mud intraclasts reflects significant input of eroded material from underlying, older successions. The ages of 13 authigenic 10Be/9Be dating samples formed three groups: (1) samples from below the base of the river terrace yielded dates of ~4.13–3.70 Ma (including uncertainties); (2) muddy intraclasts from the river terrace gave an age range of ~2.79–1.96 Ma; and (3) in situ muddy layers had ages in the range of ~1.91–1.39 Ma. The large mammal fossil assemblage from channel thalweg deposits yielded a biostratigraphic age of ~3.6–2.2 Ma, matching the age of intraclasts, and thus emphasising the redeposited origin of those fossils. The relatively wide range of authigenic 10Be/9Be dating ages is interpreted as a result of the redeposition of mud from older strata on three scales: decimetre‐scale intraclasts, millimetre‐scale rip‐up clasts mixed into the newly formed beds, and formation of two authigenic rims with different age and 10Be/9Be records around individual particles. Considering these observations, an age range of in situ layers of ~1.91–1.39 Ma is proposed as the depositional age of the river terrace, with the most probable age falling within the most recent part of this interval. The effect of redeposition is thus shown to be potentially limiting to the application of authigenic 10Be/9Be dating to incising rivers, and stands in marked contrast to aggrading river settings, where redeposition of older sediments is limited and the degree of 10Be/9Be variability is low.
Sergey Arzhannikov, Anastasia Arzhannikova, Regis Braucher, and Goro Komatsu
Elsevier BV
Thibaut Cardinal, Carole Petit, Yann Rolland, Stéphane Schwartz, Pierre Gaston Valla, Bruno Scalabrino, Laurence Audin, Maxime Bertauts, Swann Zerathe, Denis Thiéblemont,et al.
Cellule MathDoc/Centre Mersenne
. Deciphering the impact of short-term or long-term forcing on fluvial incision, as well as understanding the influence of local (channel lithology and morphology) and global (tectonic motions) parameters in the spatial variation of incision e ffi ciency, are ongoing geomorphological research fields. To shed new light on these issues, we chose to study the “Hautes Gorges du Verdon” (High Verdon Gorges or HVG), located in the foreland of the Southwestern Alps. We collected 24 samplesalongthreepolishedsurfacesforCosmicRayExposure(CRE) 36 Cldating,whichallowedusto constrain short-term incision rates ranging from 0.06 to 0.2 mm/yr between 60 and 15 ka. Compared to known regional uplift and denudation rates, incision rates obtained in the HVG suggest tectonic or isostatic uplift as the main driver of Verdon River incision in the Late Quaternary. This comparison allows us to propose that the downcutting of the Verdon Gorges started approximatively 1.5 to 2 Ma
Pierre Rochette, David Baratoux, Regis Braucher, Jean Cornec, Vinciane Debaille, Bertrand Devouard, Jerome Gattacceca, Matthieu Gounelle, Fred Jourdan, Fabien Moustard,et al.
Cellule MathDoc/Centre Mersenne
to tektites
Malgorzata U. Sliz, Beda A. Hofmann, Ingo Leya, Sönke Szidat, Christophe Espic, Jérôme Gattacceca, Régis Braucher, Daniel Borschneck, Edwin Gnos, and
Wiley
AbstractThrough the investigation of terrestrial ages of meteorites from Oman, we aim to better understand the time scales of meteorite accumulation and erosion in Oman and the meteorite flux in the past. Here, we present 14C and 14C‐10Be terrestrial ages of seven ordinary chondrite strewn fields and two unpaired single meteorites from the Sultanate of Oman. After critical evaluation of multiple data for each strewn field, we propose “best estimate terrestrial ages,” typically based on 14C/10Be. For objects for which complex irradiation histories are known or suspected, terrestrial ages were calculated solely using 14C. The best estimate strewn field ages range from 8.1 ± 3.0 ka (SaU 001) to 35.2 ± 5.1 ka (Dho 005). Including two previously dated strewn fields, the mean and median age of nine Oman strewn fields is 15.9 ± 12.3 and 13.6 ka, respectively. The new data show a general good agreement with data previously obtained in a different laboratory, and we observe a similar general correlation between strewn field ages and mean weathering grade as in previous work based on individual meteorites. Weathering degree W4 is reached for dated samples after 20–35 ka. While the age statistics of strewn fields does not show the previously observed lack of young events, the low abundance of young (0–5 ka) individual meteorites as compared with older (~20 ka) meteorites is confirmed by our data and remains unexplained.
Laurent Husson, Tristan Salles, Anne-Elisabeth Lebatard, Swann Zerathe, Régis Braucher, Sofwan Noerwidi, Sonny Aribowo, Claire Mallard, Julien Carcaillet, Danny H. Natawidjaja,et al.
Springer Science and Business Media LLC
AbstractThe migration ofHomo erectusin Southeast Asia during Early Pleistocene is cardinal to our comprehension of the evolution of the genusHomo. However, the limited consideration of the rapidly changing physical environment, together with controversial datings of hominin bearing sites, make it challenging to secure the robust timeline needed to unveil the behavior of early humans. Here, we reappraise the first appearance datum of JavaneseH. erectusby adding the most reliable age constraints based on cosmogenic nuclides$$^{10}$$10Be and$$^{26}$$26Al producedin situto a compilation of earlier estimates. We find thatH. erectusreached Java and dwelled at Sangiran, Java,ca.1.8 Ma. Using this age as a baseline, we develop a probabilistic approach to reconstruct their dispersal routes, coupling ecological movement simulations to landscape evolution models forced by reconstructed geodynamic and climatic histories. We demonstrate that the hospitableterra firmaconditions of Sundaland facilitated the prior dispersal of hominins to the edge of Java, where they conversely could not settle until the Javanese archipelago emerged from the sea and connected to Sundaland. The dispersal ofH. erectusacross Sundaland occurred over at least tens to hundreds kyr, a time scale over which changes in their physical environment, whether climatic or physiographic, may have become primary forcings on their behavior. Our comprehensive reconstruction method to unravel the peopling timeline of SE Asia provides a novel framework to evaluate the evolution of early humans.
Thibaut Cardinal, Carole Petit, Yann Rolland, Laurence Audin, Stéphane Schwartz, Pierre G. Valla, Swann Zerathe, and Régis Braucher
Elsevier BV
V. Jomelli, D. Swingedouw, M. Vuille, V. Favier, B. Goehring, J. Shakun, R. Braucher, I. Schimmelpfennig, L. Menviel, A. Rabatel,et al.
Springer Science and Business Media LLC
AbstractBased on new and published cosmic-ray exposure chronologies, we show that glacier extent in the tropical Andes and the north Atlantic regions (TANAR) varied in-phase on millennial timescales during the Holocene, distinct from other regions. Glaciers experienced an early Holocene maximum extent, followed by a strong mid-Holocene retreat and a re-advance in the late Holocene. We further explore the potential forcing of TANAR glacier variations using transient climate simulations. Since the Atlantic Meridional Overturning Circulation (AMOC) evolution is poorly represented in these transient simulations, we develop a semi-empirical model to estimate the “AMOC-corrected” temperature and precipitation footprint at regional scales. We show that variations in the AMOC strength during the Holocene are consistent with the observed glacier changes. Our findings highlight the need to better constrain past AMOC behavior, as it may be an important driver of TANAR glacier variations during the Holocene, superimposed on other forcing mechanisms.