ORCID Profile
0000-0002-4399-1903
Current Organisation
CNRS Délégation Languedoc-Roussillon
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Publisher: Elsevier BV
Date: 05-2011
Publisher: Cellule MathDoc/CEDRAM
Date: 20-01-2023
DOI: 10.5802/CRGEOS.184
Publisher: Elsevier BV
Date: 09-2006
Publisher: Springer Science and Business Media LLC
Date: 14-09-2011
Publisher: Cambridge University Press (CUP)
Date: 13-02-2007
DOI: 10.1017/S001675680700310X
Abstract: In NW Turkey, the medium-grade Kemer micaschists of the Biga Peninsula record NE-directed extension related to ductile to brittle–ductile shearing during the Palaeogene period: a lower limit for their exhumation is given by the Late Maastrichtian age of the HP–LT metamorphism of a similar nearby area (Çamlıca micaschists) an upper limit is given by the Early Eocene intrusion age of the post-kinematic Karabiga granitoid, dated as 52.7 ± 1.9 Ma using the U–Pb LA–ICP–MS method on xenotime. Correlations with the northeasterly Rhodope region and integration into the geodynamic regional frame indicate that the Kemer micaschists experienced an extensional deformation connected to a collisional context in latest Cretaceous–early Tertiary times. The Kemer micaschists therefore represent a new area (the first in Turkey), which suffered synorogenic extension in the north Aegean domain at the very beginning of Tertiary times.
Publisher: Elsevier BV
Date: 08-2013
Publisher: Springer Science and Business Media LLC
Date: 19-11-2012
Publisher: Inter-Research Science Center
Date: 10-01-2012
DOI: 10.3354/MEPS09444
Publisher: Wiley
Date: 08-03-2004
Publisher: Elsevier BV
Date: 2016
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 09-2007
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 09-2011
Publisher: GeoScienceWorld
Date: 12-08-2022
DOI: 10.2113/2022/3808313
Abstract: ~3.5-2.8 Ga granitoids from the Pilbara Craton in Western Australia are one of the most ancient and best-preserved records of early processes of continental crust generation. A number of recent studies have focused on the nature of the mantle source from which Pilbara granitoids derived, yet no consensus has been reached on whether the mantle was chondritic or depleted in the Eo/Palaeoarchaean. Here we present integrated whole-rock (major and trace elements) and zircon (U-Pb and Lu-Hf isotopes) data for 10 granitoids s led across the Mount Edgar Dome, which recorded four main magmatic events between 3.47 and 3.23 Ga. Whole-rock major and trace element analyses suggest that the s les belong to two distinct petrogenetic groups. The first group is akin to the tonalite-trondhjemite-granodiorite (TTG) suite, representing highly fractionated magmas initially formed by partial melting of a basaltic crust. The second group, here classified as granites, is best interpreted by the remelting of a basaltic crust and the addition of more evolved material, and it is striking that TTG-like and granitic magmas occurred coevally in time and space. Overall, both groups were formed through intense intracrustal differentiation processes that lead to the loss of significant geochemical information about their original sources. High-precision Lu-Hf analyses in zircon allow to obtain such information and to trace back the isotopic composition of the Palaeoarchaean mantle. A clear change from superchondritic to subchondritic Hf isotope compositions is observed between 3.47 and 3.23 Ga. The superchondritic Hf isotope composition of the 3.47 Ga old granitoids substantiates derivation from a depleted mantle source that separated from the chondritic mantle prior to 3.8 Ga. The presence of ca. 3.5 Ga old inherited zircons in younger magmas suggests that crustal remelting processes were involved in their generation. We propose that all granitoids investigated in this study had their crustal sources originated from a single mantle–crust differentiation event that occurred at 3.50 Ga. This event resulted in the differentiation, from the same original mantle, of two distinct crustal reservoirs, i.e., a mafic reservoir with a 176Lu/177Hf ratio of 0.023, and a reservoir of intermediate/felsic composition ( 176Lu/ 177Hf=0.013). 3.32-3.31 Ga-old granitoids were produced by remelting of the mafic reservoir, whereas 3.43 and 3.23 Ga granitoids derived from the intermediate/felsic reservoir. Overall, our data suggest that protracted intracrustal remelting processes and differentiation have played a key role in the formation, evolution, and maturation of the building blocks of continents during the Palaeoarchaean.
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 11-2003
Publisher: Elsevier BV
Date: 09-2017
Publisher: Wiley
Date: 20-12-2017
DOI: 10.1111/JMG.12295
Publisher: Elsevier BV
Date: 04-2009
Publisher: Elsevier BV
Date: 06-2009
Publisher: Elsevier BV
Date: 07-1994
Publisher: EDP Sciences
Date: 11-2011
DOI: 10.2113/GSSGFBULL.182.6.467
Abstract: The late stages of the Variscan orogeny in western and central Europe are characterized by the emplacement of numerous Carboniferous granitic intrusions. In the southern part of the Armorican massif, volcanic and plutonic rocks occur within the Carboniferous series of the Ancenis basin. Chemical analyses indicate that they belong to the same magmatic high-K calc-alkaline association of peraluminous composition, which likely derives from crustal melting of an igneous source. A LA-ICPMS U-Pb/zircon age of 319.3 ± 3.1 Ma dates, for the first time, this magmatic event and, by there, constrains the maximum age of both the end of the sedimentation and the northward tilting of the sediments in the Ancenis basin. This magmatic event is coeval with the sedimentation of the coal-bearing Namurian basins located along the Nort-sur-Erdre fault. These intrusions are interpreted as the feeding conduits of the volcano-sedimentary layers encountered in these basins. This would imply a minimal dextral displacement of ca. 20–25 km along the Nort-sur-Erdre fault.
Publisher: Elsevier BV
Date: 09-2009
Publisher: Oxford University Press (OUP)
Date: 03-2009
Publisher: Springer Science and Business Media LLC
Date: 26-11-2015
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 02-2019
DOI: 10.1016/J.SCITOTENV.2018.09.222
Abstract: The transfer of metal and metalloid trace elements (MTEs) from contaminated soil to grapevines is a major issue for grape consumption and for the associated health risks. Based on an isotopic approach, we shed light on the concept of MTE bioavailability. The bioavailable fractions are identified by using the Sr-isotope ratio as a proxy for MTEs. This allows us to differentiate three soil reservoirs: the 'current available fraction' in soil water, the 'reserve available fraction' stored in mineral phases of the soil fractions, and the 'non-available fraction'. The reserve available fraction, representing 10 to 60% of bulk soil depending on the MTE, includes the exchangeable, carbonates, humic substance and oxides fractions. The
Publisher: Elsevier BV
Date: 03-2018
Publisher: Geological Society of London
Date: 2014
DOI: 10.1144/SP405.6
Publisher: CPRM
Date: 04-2019
Publisher: Springer Science and Business Media LLC
Date: 07-2003
Publisher: MDPI AG
Date: 25-03-2022
DOI: 10.3390/MIN12040407
Abstract: The Passa Três granite is a 5 km2 intrusion in southern Brazil with an NNE–SSW-elongated shape, hosting gold-bearing quartz veins with fluorite, carbonates, sulphides (pyrite, chalcopyrite, aikinite, molybdenite) and native gold. Orebodies are hosted by the pluton roof zone, which is marked by various textures indicating magmatic–hydrothermal transition processes. Mineralisation formed between 613 and 608 Ma in extensional pull-apart structures controlled by two conjugated N–S and E–W fault systems. We report results from petrography, quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN), scanning electron microscopy (SEM), electron probe microanalyses (EPMA), X-ray fluorescence (XRF), trace element analyses of pyrite by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), sulphur isotope (δ34S) analyses, and fluid inclusion microthermometry. Hydrothermal alteration is dominantly developed as phengite–quartz–carbonate and sericite–carbonate–chlorite assemblages along mineralised structures. Fluid inclusion study indicates mineralising fluids with H2O-CO2-NaCl composition, low to moderate salinity (0.2–12.84 wt % NaCl eq.), and temperatures from 400 to 150 °C. The sulphur isotopic composition of pyrite (−0.1 to 1.1‰) suggests magmatic origin. These data, in conjunction with structurally controlled mineralisation enriched in Au-Bi minerals shortly post-dating the granite emplacement, appoint towards similarities between the Passa Três deposit and intrusion-related gold systems. The specific location of the mineralisation in the core (and in the roof zone, regarding its vertical position) of the Passa Três granitic intrusion defines it as “granite-hosted” thus, it is representative of a specific model that can be used for exploration of other intrusion-related/hosted gold deposits near the studied area or in other locations.
Publisher: Elsevier BV
Date: 12-2015
Publisher: Elsevier BV
Date: 06-2014
Publisher: Elsevier BV
Date: 09-2007
DOI: 10.1016/J.ACA.2007.08.015
Abstract: Ten international laboratories participated in an inter-laboratory comparison of a fossil bone composite with the objective of producing a matrix and structure-matched reference material for studies of the bio-mineralization of ancient fossil bone. We report the major and trace element compositions of the fossil bone composite, using in-situ method as well as various wet chemical digestion techniques. For major element concentrations, the intra-laboratory analytical precision (%RSD(r)) ranges from 7 to 18%, with higher percentages for Ti and K. The %RSD(r) are smaller than the inter-laboratory analytical precision (%RSD(R) <15-30%). Trace element concentrations vary by approximately 5 orders of magnitude (0.1 mg kg(-1) for Th to 10,000 mg kg(-1) for Ba). The intra-laboratory analytical precision %RSD(r) varies between 8 and 45%. The reproducibility values (%RSD(R)) range from 13 to 100% was found for the high field strength elements (Hf, Th, Zr, Nb). The rare earth element (REE) concentrations, which vary over 3 orders of magnitude, have %RSD(r) and %RSD(R) values at 8-15% and 20-32%, respectively. However, the REE patterns (which are very important for paleo-environmental, taphonomic and paleo-oceanographic analyses) are much more consistent. These data suggest that the complex and unpredictable nature of the mineralogical and chemical composition of fossil bone makes it difficult to set-up and calibrate analytical instruments using conventional standards, and may result in non-spectral matrix effects. We propose an analytical protocol that can be employed in future inter-laboratory studies to produce a certified fossil bone geochemical standard.
Publisher: Elsevier BV
Date: 07-2010
Publisher: Elsevier BV
Date: 06-2012
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 05-2016
Publisher: OpenEdition
Date: 31-12-2006
Publisher: Geological Society of America
Date: 2007
DOI: 10.1130/G23675A.1
Publisher: University of Chicago Press
Date: 11-1996
DOI: 10.1086/629863
Publisher: Elsevier BV
Date: 12-2008
Publisher: Springer Science and Business Media LLC
Date: 11-12-2012
Publisher: Elsevier BV
Date: 11-2009
Publisher: Elsevier BV
Date: 04-2016
Publisher: Elsevier BV
Date: 05-2016
Publisher: Geological Society of London
Date: 03-02-2016
DOI: 10.1144/SP428.12
Publisher: IOP Publishing
Date: 02-2017
Publisher: Elsevier BV
Date: 05-2007
Publisher: Geological Society of London
Date: 2008
DOI: 10.1144/SP297.6
Publisher: Springer Science and Business Media LLC
Date: 23-08-2014
Publisher: Oxford University Press (OUP)
Date: 24-03-2008
Publisher: Cellule MathDoc/CEDRAM
Date: 12-2003
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 03-2013
Publisher: American Geophysical Union (AGU)
Date: 12-2021
DOI: 10.1029/2020GC009627
Abstract: A new data set combining thermobarometry, geo‐thermochronology, chronostratigraphic, and structural analyses highlights the tectono‐thermal evolution of the St. Martin granodiorite from its emplacement to its surface exposure. The described vertical motions in this part of the upper plate of the Lesser Antilles subduction zone since 30 Myrs are linked to the migration of the Lesser Antilles volcanic arc toward the plate interior. Results suggest that the St. Martin granodioritic pluton emplaced at 4–5 km depth and underwent a four‐step history: (a) 30–27 Ma, emplacement along N20–40° transtensive structures oblique to the trench followed by, (b) 27–24 Ma, rapid post‐emplacement cooling and exhumation (∼0.6 mm/yr) controlled by perpendicular to the trench N45° trending structures, (c) 24–9 Ma, slow subsidence (0.01 mm/yr) and development of carbonate platforms associated to tectonic quiescence, westward migration of the arc, and subsequent cooling of the crust, (d) 9 Ma to present‐day, exhumation (∼0.25 mm/yr) and uplift of Neogene carbonate platforms mainly along N45° faults that likely accommodate the progressive trench curvature since 30 Ma. Pecube forward modeling using this scenario reproduces both the observed present‐day geometry and thermochronometric ages. A similar sequence of events is observed in the Virgin Islands. Along with our new data, this suggests a southward migration of the deformation associated with the opening of the Anegada Trough.
Publisher: Informa UK Limited
Date: 16-06-2023
Publisher: Society of Economic Geologists
Date: 2017
Publisher: Elsevier BV
Date: 12-2014
Publisher: Elsevier BV
Date: 07-2014
Publisher: Elsevier BV
Date: 05-2008
Publisher: EDP Sciences
Date: 2022
DOI: 10.1051/BSGF/2022008
Abstract: Based on new structural, petrological and U-Th-Pb geochronological data, a reappraisal of the Variscan tectono-metamorphic history of the Pelvoux Massif (External Crystalline Massif, French Alps) is proposed with the aim to understand the flow pattern and kinematics of the Variscan partially molten crust and the Eastern Variscan Shear Zone. The Pelvoux Massif consists of high-grade metamorphic rocks of middle to lower crust, mostly migmatites, that record a prominent syn-metamorphic deformation event (D 2 ) characterized by a pervasive NE-SW striking, steeply dipping, S 2 foliation, and a network of anastomosed NS and NW-SE trending shear zones, the kinematics of which indicates a sinistral transpression. Relics of an early syn-metamorphic event (D 1 /M 1 ) related to crustal thickening and top-to-the-east nappe stacking are also reported. Both the D 1 and D 2 features are interpreted as reflecting a NW-SE shortening event, firstly marked by dominant nappe stacking, and secondly overprinted by a sinistral transpression that started at peak metamorphism with the onset of crustal partial melting at ca. 650 °C during the late Visean (ca. 335–330 Ma). Ongoing sinistral D 2 transpression in the partially molten middle-lower crust of the Pelvoux involved strain partitioning between C and C’ shear zones and horizontal longitudinal flow in the range 330–300 Ma. Along the anatectic front, vertical shortening and top-to-the-NW shearing (D 3 ) is coeval with D 2 and argue for southeastward motion of the partially molten crust. The contemporaneity between NW-SE directed transpressional flow and vertical shortening is supported by our radiometric data of D 2 and D 3 and attests for strain partitioning between the suprastructure and infrastructure during horizontal crustal flow under transpressive regime. The exhumation of deep-seated rocks during sinistral transpression followed a near isothermal (ca. 700 °C) evolution down to pressure of ca. 0.5 GPa in the period 325–306 Ma. The sinistral transpression recorded in the Pelvoux Massif might corresponds to an antithetic shear zone coeval with the dextral East-Variscan Shear Zone, proposed for this part of the Variscan orogen.
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 10-2012
Publisher: Elsevier BV
Date: 10-2006
Publisher: Elsevier BV
Date: 09-2018
Publisher: Wiley
Date: 20-02-2012
Publisher: Elsevier BV
Date: 07-2007
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 12-2009
Publisher: Elsevier BV
Date: 03-2002
Publisher: Wiley
Date: 14-10-2019
DOI: 10.1111/TER.12429
Publisher: Geological Society of London
Date: 22-07-2017
DOI: 10.1144/SP427.4
Publisher: Elsevier BV
Date: 08-2010
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 04-2017
Publisher: Springer Science and Business Media LLC
Date: 16-08-1999
Publisher: Geological Society of London
Date: 2006
Publisher: Elsevier BV
Date: 2017
Publisher: Wiley
Date: 09-1998
Publisher: Informa UK Limited
Date: 13-07-2018
Publisher: Wiley
Date: 31-07-2006
Publisher: EDP Sciences
Date: 2008
DOI: 10.2113/GSSGFBULL.179.1.29
Abstract: U-Pb ages obtained from detrital zircon from terrigenous sediments are used to determine the sources. Present fluvial sand-bars of the Ogooué river yield age spectra of detrital zircons in agreement with Archean and Early Proterozoic sources found in the drainage. The large proportion of Late Proterozoic zircons cannot be derived from primary erosion of the watershed basement rocks, since there is no formation of that age in the area. This later group of zircons is in good agreement with reworking of the aeolian Paleogene Batéké Sands, by regressive erosion in the upper reaches of the Ogooué river, as they contain a majority of Late Proterozoic age zircons. The sources of Late Proterozoic zircons in the Batéké Sand are very distant, and transported and reworked – at least in part – by aeolian processes. Our results, together with the widely distributed Paleogene sediments over continental Africa, suggests that Paleogene was a time of subdued erosion of the cratonic areas and extensive reworking, transport and deposition within continental Africa. In contrast, our results from the Ogooué river indicate active present incision of the cratonic area, erosion of the previous continental sediments, and export of the river bed-load to the continental margin. This temporal evolution of erosion-transport-deposition is correlated with the drastic climate change that occurred during the Cenozoic, leading to a more efficient mechanical erosion, and it correlates with the increase of terrigenous flux to the margin, observed during the Neogene.
Publisher: Elsevier BV
Date: 06-1996
Location: France
No related grants have been discovered for Olivier Bruguier.