Papers by Christian Hibsch
HAL (Le Centre pour la Communication Scientifique Directe), Nov 1, 2021
HAL (Le Centre pour la Communication Scientifique Directe), 2005
Enregistrement des événements pyrénéo-provençaux dans les chaînes subalpines méridionales (Baronn... more Enregistrement des événements pyrénéo-provençaux dans les chaînes subalpines méridionales (Baronnies, France) Sédimentation continentale et tectonique éocènes Recording of "pyrenean-provençal" events in the southern subalpine domain (Baronnies, France). Eocene continental sedimentation and tectonism Christian MONTENAT (1,*) Pascal BARRIER (1) Christian HIBSCH (2)
Sedimentological analysis in the Griesheim quarries shows the evolution from a fluvial to a perig... more Sedimentological analysis in the Griesheim quarries shows the evolution from a fluvial to a periglacial fluvial-eolian environment (coarse sands and loess). Several deformed horizons were evidenced from these series, some of them probably related to periglacial disturbances (cryoturbation) while others clearly indicate paleoliquefaction of fine to medium sands. Unconformities suggest that these deformation occurred underwater and were subsequently buried by the ongoing sedimentation. The deformed horizons can be traced along the quarry faces. They appear at the same vertical position but the kind of deformation features varies from place to place according to the lithological interbedding which is affected. This suggests that the deformation was not due to local sedimentological influence. At least four (and possibly 6) disturbing events were identified and considered as co-seismic events.
Ce manuscrit conclut trois ans de travail, je tiens en ces quelques lignes à exprimer ma reconnai... more Ce manuscrit conclut trois ans de travail, je tiens en ces quelques lignes à exprimer ma reconnaissance envers tous ceux qui de près ou de loin y ont contribué. Ces travaux de thèse ont été financés trois années consécutives par le programme CNRS ST-INSU-CT5. A mon co-directeur de thèse, Christian Hibsch, Merci Christian, pour m'avoir fait confiance, pour m'avoir transmis ta passion, pour m'avoir intégrée à ce projet, mais également pour le temps conséquent que tu m'as consacrée au laboratoire et sur le terrain. J'ai beaucoup appris à tes côtés, tes qualités pédagogiques et scientifiques m'ont permis de développer mon esprit critique et scientifique. Je profite de l'occasion pour t'exprimer ici ma plus profonde gratitude, je suis très honorée d'avoir été ton jeune Padawan! A Alexandre Tarantola, Pour ta grande patience, ta gentillesse et ta disponibilité ainsi que de ton grand intérêt pour le sujet, ton expérience des fluides m'a été très bénéfique. A Michel Cathelineau, mon Directeur de thèse Pour avoir accepté de diriger ce travail et pour le temps que vous m'avez accordé, malgré votre planning chargé, pour les observations microscopiques et les discussions sur les minéralisations, veuillez trouver ici mes sincères remerciements. A Jacques Pironon, directeur de ce laboratoire Pour m'avoir acceptée au sein de l'unité et d'avoir été attentif à mon travail.
Sedimentary Geology, 2020
Unlike most Neogene basins of the Betic Cordillera where the Salinity Crisis is dated to the Mess... more Unlike most Neogene basins of the Betic Cordillera where the Salinity Crisis is dated to the Messinian, a contradictory Tortonian dating was proposed for evaporites of the Lorca Basin. As a consequence, complex structural models have been proposed in the literature to explain this discrepancy in the timing of evaporites. In order to integrate the Lorca Basin into the geological context of the western Mediterranean domain during the Late Miocene, new sedimentological and stratigraphical studies coupled with new dating were performed, which allow us to propose a Messinian age for both diatomite-bearing deposits and evaporites of the Lorca Basin. These new ages challenge the idea of a Tortonian salinity crisis in the Lorca Basin. Three main events of base-level drop were evidenced during the Messinian. Each event is correlated with successive steps of basin restriction. Shallow salina evaporites were deposited after a base-level fall during the Messinian before a final base-level drop, which led to the entire exposure of the basin. This last exposure is interpreted as coeval with the deposition of first evaporites and halite in the deep Mediterranean basins. The reflooding which allowed the deposition of brackish deposits and a short-lived marine incursion occurred at the end of the Messinian. Base-level drops occurred during eustatic falls amplified by the gradual uplift of the Betic Cordillera. The exhumation of the Tercia ridge along the strike-slip Alhama de Murcia fault system during the Messinian probably favoured the gradual restriction of the basin. A discussion on correlations of main unconformities between several Neogene basins of the Betics is proposed, suggesting a similar structural evolution at the regional scale.
Sedimentary Geology, 2020
Unlike most Neogene basins of the Betic Cordillera where the Salinity Crisis is dated to the Mess... more Unlike most Neogene basins of the Betic Cordillera where the Salinity Crisis is dated to the Messinian, a contradictory Tortonian dating was proposed for evaporites of the Lorca Basin. As a consequence, complex structural models have been proposed in the literature to explain this discrepancy in the timing of evaporites. In order to integrate the Lorca Basin into the geological context of the western Mediterranean domain during the Late Miocene, new sedimentological and stratigraphical studies coupled with new dating were performed, which allow us to propose a Messinian age for both diatomite-bearing deposits and evaporites of the Lorca Basin. These new ages challenge the idea of a Tortonian salinity crisis in the Lorca Basin. Three main events of base-level drop were evidenced during the Messinian. Each event is correlated with successive steps of basin restriction. Shallow salina evaporites were deposited after a base-level fall during the Messinian before a final base-level drop, which led to the entire exposure of the basin. This last exposure is interpreted as coeval with the deposition of first evaporites and halite in the deep Mediterranean basins. The reflooding which allowed the deposition of brackish deposits and a short-lived marine incursion occurred at the end of the Messinian. Base-level drops occurred during eustatic falls amplified by the gradual uplift of the Betic Cordillera. The exhumation of the Tercia ridge along the strike-slip Alhama de Murcia fault system during the Messinian probably favoured the gradual restriction of the basin. A discussion on correlations of main unconformities between several Neogene basins of the Betics is proposed, suggesting a similar structural evolution at the regional scale.
tectonic evolution of Naxos Island through a multi-faceted
Mineralium Deposita, 2021
The Djebel El Hamra Pb-Zn-Ba-Sr (Hg) deposits in northern Tunisia are hosted in a post-nappe anti... more The Djebel El Hamra Pb-Zn-Ba-Sr (Hg) deposits in northern Tunisia are hosted in a post-nappe anticline with a core of a Triassic evaporite diapir affected by the NE–SW-trending Ghardimaou-Cap Serrat lineament. Three stages of mineralization occurred in the Triassic dolostone: stages I and II caused alternating deposition of sulfate (Ba, Sr) and sulfide (sphalerite, galena) minerals; stage III formed late-stage calcite-marcasite-cinnabar. Zebra textures record the syntectonic transition from compression to extension in the Late Tortonian-Messinian interval. Two fluid end-members were involved in sulfate deposition: one low-salinity (L1, ~3 wt% eq. NaCl) fluid, probably from a meteoric origin, and a Na-Ca-Cl brine (L2, ~22 wt% eq. NaCl) solution which originated from the Triassic diapiric source. A third end-member fluid (L3) with long residence time in the basement was also involved in the Pb-Zn deposition. The δ34S values from a cluster of sulfates around +16‰, show a Triassic evaporate source. The sulfur in sphalerite resulted from bacterial sulfate reduction (BSR); however, crystallization in a closed system resulted in a range of δ34S between +1.6 and +26.5‰. The δ34S values in galena (−28.4 to +8.2‰) are consistent with a BSR and thermochemical sulfate reduction (TSR) origin of the sulfur. Secondary ion mass spectrometry (SIMS) lead isotope data in galena (207Pb/204Pb: 15.595 to 16.193, 206Pb/204Pb: 18.673 to 18.939, 208Pb/204Pb: 38.330 to 40.572) point to local contributions (sedimentary and Cenozoic magmatic rocks) to the main source from the Precambrian basement. Ore deposition occurred at a depth of about 2 km at temperatures between 80 and 250 °C. A shallow magmatic heat source was the cause of these thermal fluctuations.
L'utilisation privilegiee de l'approche tectonosedimentaire a permis de definir des calen... more L'utilisation privilegiee de l'approche tectonosedimentaire a permis de definir des calendriers de paleocontraintes, tant en domaine de faible deformation (tectonique permo-cenozoique en grande-bretagne) qu'en domaine plisse (tectonique cretacee dans l'arc de castellane, s. E. France). En grande-bretagne, il a ete ainsi definit une extension nnw-sse datee du permien au trias inferieur, une extension e-w a ene-wsw datee du trias superieur a l'oxfordien inferieur, une extension n-s a nne-ssw associee a un regime decrochant e-w a wnw-ese, tous deux dates du malm moyen au cretace inferieur puis enfin, deux regimes decrochants compressifs successifs nw-se puis n-s, respectivement dates du paleocene a l'eocene inferieur et de l'eocene moyen jusqu'a une limite superieure incertaine au cours du cenozoique. Les trois premieres extensions ont pu etre correlees avec l'evolution polyphasee du rifting atlantique, alors que les regimes decrochants compressifs o...
Dans le Boulonnais, les formations argileuses et sableuses de la Pointe aux Oies, pres de Wimereu... more Dans le Boulonnais, les formations argileuses et sableuses de la Pointe aux Oies, pres de Wimereux constituent une butte residuelle. Elles ont ete jadis attribuees au Quaternaire moyen pour raison altitudinale. Elles correspondent en fait a un paleoestuaire du Pliocene moyen preserve sur un platier altere plus ancien. Elles sont posterieures a la formation diestienne (Messinien) des Noires Mottes. Les argiles a «biscuits» appartiennent a la fin du Pliocene ancien (Zancleen) et les sables et graviers au Pliocene moyen (Piacenzien). Cette formation dite de la Slack est anterieure a celle du Fart, a Wissant, rattachee au Cromerien qui y est incisee. L'industrie du paleolithique inferieur de la Pointe aux Oies n'a rien a voir avec la formation de la Slack, mais se retrouve dans la nappe quaternaire qui tronque cette formation a la base de la dune, dans un complexe sableux posterieur et en avant de la falaise; elle se rattache au complexe cromerien de la carriere du Fart.
Journal of the Virtual Explorer, 2007
We propose a reconstruction of the thermal-mechanical evolution of the Aegean orogenic wedge base... more We propose a reconstruction of the thermal-mechanical evolution of the Aegean orogenic wedge based on a synthesis of previously published work and preliminary results of our own multi-disciplinary study on the Naxos island. Naxos is characterized by the juxtaposition of metamorphic rocks and Early Miocene to Upper Pliocene sedimentary basins along a low-angle detachment. The lowest structural level comprises migmatites,
Marine and Petroleum Geology, 2014
Impact of basin burial and exhumation on Jurassic carbonates diagenesis on both sides of a thick ... more Impact of basin burial and exhumation on Jurassic carbonates diagenesis on both sides of a thick clay barrier (Paris Basin, NE France)
ABSTRACT Fluid inclusions trapped in quartz veins hosted by a leucogneiss from the southern part ... more ABSTRACT Fluid inclusions trapped in quartz veins hosted by a leucogneiss from the southern part of the Naxos Metamorphic Core Complex (Attic-Cycladic-Massif, Greece) were studied to determine the evolution of the fluid record of metamorphic rocks during their exhumation across the ductile/brittle transition. Three sets of quartz veins (V-M2, V-BD & V-B) are distinguished. The V-M2 and V-BD are totally or, respectively, partially transposed into the foliation of the leucogneiss. They formed by hydrofracturing alternating with ductile deformation accommodated by crystal-plastic deformation. The V-B is discordant to the foliation and formed by fracturing during exhumation without subsequent ductile transposition. Fluids trapped during crystal–plastic deformation comprise two very distinct fluid types, namely a CO2-rich fluid and a high-salinity brine, that are interpreted to represent immiscible fluids generated from metamorphic reactions and the crystallization of magmas respectively. They were initially trapped at ~625 °C and 400 MPa and then remobilized during subsequent ductile deformation resulting in various degrees of mixing of the two end-members with later trapping conditions of ~350 °C and 140 MPa. In contrast, brittle microcracks contain aqueous fluids trapped at 250 °C and 80 MPa. All veins display a similar δ13C pointing to carbon that was trapped at depth and then preserved in the fluid inclusions throughout the exhumation history. In contrast, the δD signature is marked by a drastic difference between (i) V-M2 and V-BD veins that are dominated by carbonic, aqueous-carbonic and high-salinity fluids of metamorphic and magmatic origin characterized by δD between −56‰ and −66‰, and (ii) V-B veins that are dominated by aqueous fluids of meteoric origin characterized by δD between −40‰ and −46‰. The retrograde P–T pathway implies that the brittle/ductile transition separates two structurally, chemically and thermally distinct fluid reservoirs, namely (i) the ductile crust into which fluids originating from crystallizing magmas and fluids in equilibrium with metamorphic rocks circulate through a geothermal gradient of 30 °C km−1 at lithostatic pressure, and (ii) the brittle upper crust through which meteoric fluids percolate through a high geothermal gradient of 55 °C km−1 at hydrostatic pressure.
Journal of African Earth Sciences
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Papers by Christian Hibsch