Gérard Gleizes

Centre National de la Recherche Scientifique

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J. L. Bouchez

Géosciences Environnement Toulouse

Philippe Olivier

Institut Clément Ader

Pierre Barbey

Centre National de la Recherche Scientifique

Denis R. LeBlanc

United States Geological Survey

Yoann Denèle

Géosciences Environnement Toulouse

Eric C. Ferré

New Mexico State University

Jean‐Luc Bouchez

Observatoire Midi-Pyrénées

Asfawossen Asrat

Addis Ababa University

Jean‐Louis Paquette

Laboratoire Magmas et Volcans

Anne Nédélec

Géosciences Environnement Toulouse

Cooperative Institutions

Centre National de la Recherche Scientifique

Université Toulouse III - Paul Sabatier

Centre de Recherches Pétrographiques et Géochimiques

Université de Lorraine

Institut de Recherche pour le Développement

Université de Toulouse

Universidad de Zaragoza

University of the Basque Country

Géosciences Environnement Toulouse

Observatoire Midi-Pyrénées

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Sigmoidal structures featuring dextral shear during emplacement of the Hercynian granite complex of Cauterets–Panticosa (Pyrenees)

Journal of Structural Geology (1998)

Gérard Gleizes Denis R. LeBlanc Vicente Santana Philippe Olivier J. L. Bouchez

Transpression

Lineation

10.1016/s0191-8141(98)00060-1

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Citations (79)

Petrology and Isotope Geochemistry of the Pan-African Negash Pluton, Northern Ethiopia: Mafic-Felsic Magma Interactions During the Construction of Shallow-level Calc-alkaline Plutons

Journal of Petrology (2004)

Asfawossen Asrat Pierre Barbey Ludden John N.Laurie Reisberg Gérard Gleizes

The Negash pluton consists of monzogranites, granodiorites, hybrid quartz monzodiorites, quartz monzodiorites and pyroxene monzodiorites, emplaced at 608 ± 7 Ma (zircon U–Pb) in low-grade volcaniclastic sediments. Field relationships between mafic and felsic rocks result from mingling and hybridization at the lower interface of a mafic sheet injected into partially crystallized, phenocryst-laden, granodiorite magma (back-veining), and hybridization during simultaneous ascent of mafic and felsic magmas in the feeder zone located to the NW of the pluton. The rock suite displays low 87Sr/86Sr(608) (0·70260–0·70350) and positive εNd(608) values (+3·9 to +5·9), along with fractionated rare earth element patterns [(La/Yb)N = 9·9–17·7], enrichment in large ion lithophile elements (Ba, U, K, Pb and Sr) and depletion in Nb and Th compared with the primitive mantle. Monzogranites, granodiorites and hybrid quartz monzodiorites define a calc-alkaline differentiation trend, whereas the quartz monzodiorites have higher Fe/Mg ratios. The pyroxene monzodiorites show anomalously high Ti/Zr, Ti/Y and Ti/V ratios, suggesting that they are cumulates. Chemical modelling suggests that pyroxene and quartz monzodiorites could derive from a common gabbrodioritic parent by fractional crystallization. Structural and chemical data suggest that (1) the pluton results from the assembly of several, low-viscosity, melt-rich batches (sheeting/dyking), differentiated in intermediate chambers prior to their emplacement; (2) in situ differentiation is limited to the coarse-grained pyroxene monzodiorites; (3) mafic–felsic magma interactions at the emplacement level were essentially limited to mingling.

Felsic

Pyroxene

Fractional crystallization (geology)

10.1093/petrology/egh009

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Citations (38)

Mechanisms and duration of non-tectonically assisted magma emplacement in the upper crust: The Black Mesa pluton, Henry Mountains, Utah

Tectonophysics (2006)

Michel de Saint Blanquat Guillaume Habert Eric Horsman Sven Morgan Basil Tikoff

Lineation

Magma chamber

Sill

10.1016/j.tecto.2006.07.014

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Citations (170)

Oblique magmatic structures of two epizonal granite plutons, Hoggar, Algeria: late-orogenic emplacement in a transcurrent orogen

Tectonophysics (1997)

Mohamed-Toufik Djouadi Gérard Gleizes Eric C. Ferré J. L. Bouchez Renaud Caby

Lineation

Transpression

Orogeny

10.1016/s0040-1951(97)00123-6

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Citations (42)

The Pan-African Toro Complex (northern Nigeria): magmatic interactions and structures in a bimodal intrusion

Geological Magazine (1996)

J. Déléris Anne Nédélec Eric C. Ferré Gérard Gleizes R.-P. Ménot

Abstract The Toro Complex is one of the Pan-African Older Granites of Nigeria, first described as a reversely zoned pluton made of a central dioritic mass surrounded by a broad granitic rim. It has been thoroughly reinvestigated both from the petrographic and structural points of view, with the help of systematic anisotropy of magnetic susceptibility (AMS) measurements. The granite main body is a hornblende–biotite porphyritic monzogranite characterized by an early submagmatic fabric displaying a concentric pattern of foliations and west plunging lineations (stage 1). This fabric is overprinted by a later one due to solid-state strain along north-south subvertical dextral shear zones (stage 2). In the vicinity of the diorite, an evengrained granite displays magmatic structures that are contemporaneous with this strike-slip event. The diorite–granite contact is a complex zone where field, petrographic and geochemical data enable recognition of the effects of mixing and mingling between a mafic and a felsic magma. Tonalites cropping out within this contact zone are interpreted as hybrid rocks. The reverse zonation of the diorite itself is also the result of some hybridization process. Magmatic interactions mainly resulted from in situ infiltration of granitic liquid into the dioritic mass. The detailed history of this bimodal intrusion began with the emplacement of the granitic magma acquiring a first stage fabric. Before full crystallization of the granitic core, intrusion of the dioritic magma permitted reheating of the granitic magma that then crystallized with specific structural characters. The second stage structures, whether characterized by magmatic fabric near the diorite or by solid-state strain features in north–south shear zones elsewhere in the granite, are related to late Pan-African dextral strike-slip tectonics in the basement of northern Nigeria. The bimodal Toro Complex is therefore considered as a late Pan-African syntectonic pluton.

Diorite

Porphyritic

Felsic

Dike

Igneous differentiation

Lineation

Hornblende

10.1017/s0016756800007822

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Citations (24)

Timing of granite emplacement, crustal flow and gneiss dome formation in the Variscan segment of the Pyrenees

Figshare (2016)

Yoann Denèle Bernard Laumonier Jean‐Louis Paquette Philippe Olivier Gérard Gleizes

The Variscan segment of the Pyrenees is well suited to study the timing of crustal-scale deformations as crustal flow and gneiss dome formation. This has been constrained from a synthesis of available structural and geochronological data of intrusive rocks, as well as new zircon U–Pb age determinations via laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). After a stage of moderate thickening by fold–thrust belt development in the upper crust between 323 and 308 Ma, the Variscan segment of the Pyrenees experienced crustal flow at c. 306 Ma and then gneiss dome formation at c. 304 Ma. Localization of the deformation along reverse-dextral shear zones occurred at c. 300 Ma. The Variscan segment of the Pyrenees recorded a high-temperature regime, which allowed crustal flow of the middle crust, but with limited amounts of heat which induced rapid cooling. The development of this enigmatic orogenic segment of the Variscan belt is closely contemporaneous with the formation of the Cantabrian Orocline and could correspond to a lithospheric-scale shear zone that accommodated buckling of the orocline. Late Variscan lithospheric delamination and asthenospheric upwelling associated with buckling in the core of the Cantabrian Orocline could explain the short-period high-temperature regime in the Variscan segment of the Pyrenees.

Dome (geology)

10.6084/m9.figshare.3453671

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Citations (0)

Discriminating Variscan and Alpine deformation in the Eastern Pyrenees. Insight from an AMS study in the Sant Llorenç-La Jonquera pluton

Geogaceta (2008)

Elena Druguet Gérard Gleizes Phillippe Olivier Montserrat Liesa Lina M. Castaño

Las fabricas anisotropas magmaticas en el pluton de Sant Llorenc-La Jonquera, determinadas mediante la tecnica de la anisotropia de la susceptibilidad magnetica (ASM), presentan una direccion predominante NE-SW y responden al emplazamiento sintectonico de una secuencia de granitoides durante la fase varisca transpresiva F2. La foliacion magmatica se encuentra localmente perturbada por el efecto de dos eventos tectonicos de naturaleza y edades distintas. Un primer tipo de perturbacion es la derivada de la presencia de zonas de cizalla tardi-variscas (F3) de direccion NW-SE, como es el caso de la banda milonitica de El Pertus. El otro tipo de perturbacion consiste en un basculamiento de eje WNW-ESE, localizado en el borde meridional del batolito y atribuible al plegamiento alpino. El presente estudio contribuye a esclarecer cuales son los efectos de la orogenia alpina en el zocalo varisco de los Pirineos.

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Citations (1)

Magnetic susceptibility and AMS of the Bushveld alkaline granites, South Africa

Tectonophysics (1999)

Eric C. Ferré J. C. Wilson Gérard Gleizes

Lineation

Layering

Layered intrusion

Chromite

Batholith

10.1016/s0040-1951(99)00122-5

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Citations (49)

Réponse à l’observation de B. Laumonier

BSGF – Earth Sciences Bulletin (2004)

Jean-Baptiste Auréjac Gérard Gleizes Hervé Diot Jean‐Luc Bouchez

Research Article| November 01, 2004 Réponse à l’observation de B. Laumonier Jean-Baptiste Aurejac; Jean-Baptiste Aurejac 1Equipe Géodynamique/Pétrophysique, UMR 5563 CNRS, Université Paul-Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France. Search for other works by this author on: GSW Google Scholar Gerard Gleizes; Gerard Gleizes 1Equipe Géodynamique/Pétrophysique, UMR 5563 CNRS, Université Paul-Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France. Search for other works by this author on: GSW Google Scholar Herve Diot; Herve Diot 2Centre Littoral de Géophysique, Pôle Science et Technologie, Université de La Rochelle, Avenue Michel Crepeau, 17042 La Rochelle cedex 1, France. Search for other works by this author on: GSW Google Scholar Jean-Luc Bouchez Jean-Luc Bouchez 1Equipe Géodynamique/Pétrophysique, UMR 5563 CNRS, Université Paul-Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France. Search for other works by this author on: GSW Google Scholar Author and Article Information Jean-Baptiste Aurejac 1Equipe Géodynamique/Pétrophysique, UMR 5563 CNRS, Université Paul-Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France. Gerard Gleizes 1Equipe Géodynamique/Pétrophysique, UMR 5563 CNRS, Université Paul-Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France. Herve Diot 2Centre Littoral de Géophysique, Pôle Science et Technologie, Université de La Rochelle, Avenue Michel Crepeau, 17042 La Rochelle cedex 1, France. Jean-Luc Bouchez 1Equipe Géodynamique/Pétrophysique, UMR 5563 CNRS, Université Paul-Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France. Publisher: Société Géologique de France First Online: 07 Mar 2017 Online ISSN: 1777-5817 Print ISSN: 0037-9409 Société géologique de France Éditeur, Paris Bulletin de la Société Géologique de France (2004) 175 (6): 660–661. https://doi.org/10.2113/175.6.660 Article history First Online: 07 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Jean-Baptiste Aurejac, Gerard Gleizes, Herve Diot, Jean-Luc Bouchez; Réponse à l’observation de B. Laumonier. Bulletin de la Société Géologique de France 2004;; 175 (6): 660–661. doi: https://doi.org/10.2113/175.6.660 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin de la Société Géologique de France Search Advanced Search This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

10.2113/175.6.660

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Citations (21)

Internal fabric and strike‐slip emplacement of the Pan‐African granite of Solli Hills, northern Nigeria

Tectonics (1995)

Eric C. Ferré Gérard Gleizes J. L. Bouchez Paulinus N. Nnabo

The Solli Hills pluton (250 km 2 ) in northern Nigeria is an example of a Pan‐African granite emplaced circa 580 Ma ago in the Jos ‐ Adamawa block. Its micro structures and internal fabrics have been studied in order to help constrain the kinematics of the Pan‐African orogeny in this block. We used field observations and measurements, petrographic examinations, and measurements of the magnetic susceptibility and anisotropy of magnetic susceptibility of 124 regularly spaced stations. Most samples are ferromagnetic, i.e., belong to the magnetite‐series granites, and present predominantly magmatic microstructures. Particularly remarkable are the asymmetrical zoning of the petrographic types, the susceptibility magnitudes, and the planar ‐ linear magnetic fabrics. The magnetic foliations and lineations are very consistent in the pluton, around N 20°E, 60°W and N 205°E, 10°, respectively. Field and microscopic observations reveal that deformation occurred everywhere in the pluton and immediate country‐rock envelope during a dextral strike‐slip synplutonic episode. It is suggested that the Solli Hills pluton was emplaced in a late Pan‐African dextral tear‐fault system. The striking fabric asymmetry of the pluton strongly suggests a shear zone termination emplacement model.

Lineation

Dike

Transpression

10.1029/95tc01445

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Citations (56)