Bruno Goffé

Centre National de la Recherche Scientifique

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Laurent Jolivet

Sorbonne Université

André Michard

Université Paris-Saclay

Fabrice Brunet

Institut de Recherche pour le Développement

Olivier Beyssac

Institut de minéralogie, de physique des matériaux et de cosmochimie

Omar Saddiqi

University of Hassan II Casablanca

Olivier Vidal

Institut des Sciences de la Terre

Roland Oberhänsli

University of Potsdam

Gaëtan Rimmelé

Total (France)

Romain Bousquet

Sorbonne Université

Nathaniel Findling

Institut des Sciences de la Terre

Cooperative Institutions

Centre National de la Recherche Scientifique

101

Sorbonne Université

Institut des Sciences de la Terre

Université Paris Cité

Institut de Recherche pour le Développement

Laboratoire de Géologie de l’École Normale Supérieure

École Normale Supérieure - PSL

Université Grenoble Alpes

Université Gustave Eiffel

Université Savoie Mont Blanc

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Zeolitization of basalts in subaqueous freshwater settings: Field observations and experimental study

Geochimica et Cosmochimica Acta (1993)

Christian Robert Bruno Goffé

Massif

10.1016/0016-7037(93)90142-j

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Citations (27)

Subduction Tectonics and Exhumation of Metamorphic Rocks In The Mediterranean Region

EGS General Assembly Conference Abstracts (2002)

Laurent Jolivet Claudio Faccenna Bruno Goffé E. Burov Philippe Agard

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Citations (0)

Explanatory notes to the map : metamorphic structure of the Alps transition from the Western to the Central Alps

Romain Bousquet Martin Engi G. Gosso Roland Oberhänsli A. Berger

10.7892/boris.86506

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Citations (36)

Les associations minéralogiques des roches hyperalumineuses du Dogger de Vanoise. Leur signification dans le métamorphisme régional

Bulletin de la Société française de Minéralogie et de Cristallographie (1977)

Bruno Goffé Pierre Saliot

The hyperaluminous rocks from Vanoise occur on the western border of the basement of southern Vanoise (internal part of Briançonnais zone) and on the « zone houillère » (external part of Briançonnais) . The most characteristic assemblages are : 1) Pyrophyllite-diaspore-magnesiocarpholite ± chloritoïd ± paragonite ± chlorite + white mica. 2) Chloritoïd-white mica-paragonite ± chlorite. The cracks with a paragonite filling are abundant in all the hyperaluminous rocks and they suggest a sodic enrichment, the role of which is discussed as for the unstability of some minerals. Due to the coexistence of diaspore-pyrophyllite and the Si⁴ = 3,2 content of phengite the temperature and pressure of metamorphism was around 360° C and 5 kb.

Pyrophyllite

Phengite

10.3406/bulmi.1977.7153

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Citations (9)

Tectonic and metamorphic evolution of the Temsamane units, External Rif (northern Morocco)

F. Negro Philippe Agard Bruno Goffé Omar Saddiqi

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Citations (3)

Contrasted metamorphic evolutions in thrusted cover units of the Briançonnais zone (French Alps): A model for the conservation of HP-LT metamorphic mineral assemblages

Earth and Planetary Science Letters (1984)

Bruno Goffé Bruce Velde

Lawsonite

Greenschist

Blueschist

Pyrophyllite

10.1016/0012-821x(84)90166-3

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Citations (65)

Tectonic and metamorphic evolution of the Temsamane units, External Rif (northern Morocco): implications for the evolution of the Rif and the Betic–Rif arc

Journal of the Geological Society (2007)

F. Negro P. Agard Bruno Goffé Omar Saddiqi

Located at an intermediate position in the External Rif nappe pile, the Temsamane units (northern Morocco) are characterized by an abnormally intense metamorphism and a penetrative ductile deformation. We present new metamorphic data showing that, in spite of their external position in the Rif, part of the Temsamane units underwent medium-pressure low-temperature (MP–LT) metamorphism (at c . 7–9 kbar and 330–430 °C), possibly during the Oligocene. Structural data show that the exhumation of these units, during Middle to Late Miocene times, was characterized by an intense approximately east–west stretching and by top-to-the-west shear senses. We tentatively propose two possible origins for the MP–LT Temsamane units: (1) an internal origin related to the subduction and the HP–LT event recorded in the Internal Rif (Alboran Domain), or (2) an external origin, implying a second subduction system within the External Rif, parallel to and almost contemporaneous with that of the Alboran Domain. This tectonometamorphic evolution of the Temsamane units is set within the context of the External Rif evolution. At a larger scale, we show that the exhumation history of the Temsamane units, which strongly resembles that documented in the core of the internal Betics, is compatible with the westward slab retreat occurring during the Middle to Late Miocene in the Betic–Rif region.

10.1144/0016-76492006-112

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Citations (57)

Late Cretaceous exhumation of the Oman blueschists and eclogites: a two‐stage extensional mechanism

Terra Nova (1994)

André Michard Bruno Goffé Omar Saddiqi Roland Oberhänsli Anke S. Wendt

ABSTRACT The continental material of the Saih Hatat window has been affected by a Late Cretaceous, obduction‐related, HP‐LT metamorphism below the Oman ophiolite. A high‐rate exhumation process is witnessed by the Maastrichtian‐Palaeocene onlap onto the blueschist‐facies rocks. Drastic metamorphic omissions are documented between the lowest, eclogitic units and the overlying, blueschist‐facies ones. Widespread late‐metamorphic shear structures point to a top‐to‐the‐NNE detachment, in opposition to the sense of the Late Cretaceous obduction. The inversion of the shearing sense occurred under similar, low temperature conditions in both the blueschist and eclogite‐facies units. Admitting that these HP‐LT metamorphic rocks formed progressively at various depth in the subducting Arabian margin, a two‐stage extensional mechanism of exhumation is suggested: (i) early uplift of the eclogitic rocks up to the blueschists depth by ductile thinning or squeezing of a ‘blind extensional allochthon'; (ii) exhumation of the whole HP‐LT metamorphic core complex by inversion of the obduction sole‐thrust and isostatic rebound of the lower plate.

Blueschist

Obduction

Metamorphic core complex

10.1111/j.1365-3121.1994.tb00514.x

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Citations (66)

Effects of pressure on thermal evolution of organic matter

AAPG Bulletin (1989)

Bruno Goffé Florent Dominé

In the internal metamorphic zones of the French Alps, organic matter-bearing terrestrial sediments of Dogger age underwent an Eocene high-pressure metamorphic event (607 kbar at 300{degree}-330{degree}C). These metasediments now contain, trapped in metamorphic minerals, low evolved kerogen (small extent of molecular orientation), heavy hydrocarbon compounds (aromatic and aliphatic up to C{sup 30} with traces of pristane and phytane molecules), and gases with low C{sup 1}/C{sup 2}-C{sup 6} ratios. However, the degree of organic maturation (equivalent to catagenesis) is much less than that predicted by classical models. This field example indicates that the oil window opens with increasing pressure. Experimental pyrolysis of supercritical hexane performed in a closed, constant-pressure gold reactor at 210-15,600 bars pressure range and 290{degree}-365{degree}C, clearly demonstrates the important influence of pressure on the product distribution of hexane pyrolysis: as pressure is increased, relative light product yields decrease and heavy products increase. This can be interpreted mainly by considering the activation volumes of the reactions involved. In conclusion, the experimental and natural examples presented here indicate that the rate of thermal maturation decreases with pressure.

Phytane

Degree (music)

Hexane

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Zeolitization of a basaltic flow in a continental environment : an example of mass transfer under thermal control

Bulletin de Minéralogie (1988)

Christian Robert Bruno Goffé Pierre Saliot

The zeolitization of basanite lava flows in the Plateau des Coirons, Ardèche, France, is controlled by the initial location of the flows in paleorivers and by the thermal evolution of the flows during cooling. It predates the development of a well-defined columnar jointing. The zeolites (phillipsite and chabazite) are associated with ferro-magnesian or aluminous smectites (and sometimes carbonates) and crystallize in basalt vesicles and veinlets, showing chemical variations between the top and the deeply altered base of the flow. Their distribution is accounted for by hydrothermal mass transfer driven by the temperature variations within the flow during cooling : — The centre of the flow is at first hotter than the base. Ferro-magnesian smectites crystallize in the median part and aluminous smectites crystallize at the base of the flow. — Then, the base of the flow becomes the hotter zone. Phillipsite crystallizes in the median part and ferro-magnesian smectites in the lower part of the flow. — The end of cooling leads to a more general development of phillipsite and chabazite crystallization at the base.

Chabazite

10.3406/bulmi.1988.8085

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Citations (12)