Geometry and tectonic significance of Albian sedimentary dykes in the Sisteron area, SE France

Huang, Qin

doi:10.1016/0191-8141(88)90033-8

Cited by 28 publications

(25 citation statements)

References 11 publications

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“…15). Consequently, the paleoes 3 direction during sand injection would have been about N140e150 (set 2), which we infer to be related to a regional extensional direction at that time (Huang, 1988). The system of dykes studied on the VieuxeBevons outcrop is commonly observed in other parts of the study area (Fig.…”

Section: Sand Injectites Vs Stress Fieldmentioning

confidence: 96%

“…Because the sand injectites should preserve tensile cracks parallel to the maximum compressive stress s 2, and perpendicular to the minimum compressive stress s 3 (Anderson, 1951), we examined the composite geometry of the injectite network in the study area to infer the principle paleostress directions (Delaney et al, 1986;Huang, 1988;Beacom et al, 1999;Boehm and Moore, 2002;Bureau et al, 2012), assuming s 1 to be vertical for the simple tectonic case. Considering the various dyke orientations, we chose dykes trending N50e60 (set 1) to be those that formed normal to s 3 by tensile failure because the N50e60 dykes are more abundant and usually thicker than the other sets of dykes and they are never associated with preeexisting faults.…”

Section: Sand Injectites Vs Stress Fieldmentioning

confidence: 99%

“…Since the 80's they are attributed to an active sand injection process (Beaudoin and Fri es, 1982;Beaudoin et al, 1985a,b;Parize, 1988;Huang, 1988;Parize and Fri es, 2003;Parize et al, 2007a,b). From the architecture of the sand network, the initial model suggested a downward and/or a lateral injection.…”

Section: Introductionmentioning

confidence: 99%

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Sand injectites network as a marker of the palaeo–stress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France

Monnier

Gay

Imbert

et al. 2015

Journal of Structural Geology

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Sand injectites network as a marker of the palaeoestress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France a b s t r a c t A large sand injectite network is very well exposed in the area of Bevons, Southeast France. The associated sandstone turbiditic channelefill and the host marls are the AptianeAlbian rocks of the Vocontian Basin. The sand injection network is composed of dykes, sills and sedimentary laccoliths ranging in thickness from mm to pluriem. The dykes and sills have vertical and horizontal lengths of up to and over 100 m and 1 km, respectively. Outcrop observations show that the architecture and morphology of the sand injectites in the marls is governed by the local stress field during injection, preeexisting faults, the hosterock lithology, compaction, and distance to the potential sand source(s). The main set of dykes is oriented N50e60 perpendicular to the minimum compressive stress s 3 during sand injection. Two other sets of dykes are intruded along preeexisting synesedimentary faults oriented N140e150 (set 2) and N90 (set 3) during the AptoeCenomanian interval. Sills and dykes thin laterally away from their potential sand sources and thin laterally away from them. The vertical thickness variations of the dykes and wings are more complex, as thinning away from the sand sources is often compensated by thickening toward the palaeoesurface. Based on field observations and measurements, we characterized the 3D architecture of the sand injectites and showed that the injectites probably formed due to a forceful injection from an overpressured sand body sealed by lowepermeability lithologies.

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Section: Sand Injectites Vs Stress Fieldmentioning

confidence: 96%

Section: Sand Injectites Vs Stress Fieldmentioning

confidence: 99%

See 1 more Smart Citation

Sand injectites network as a marker of the palaeo–stress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France

Monnier

Gay

Imbert

et al. 2015

Journal of Structural Geology

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“…The geometry of dykes is often treated as part of a regional geological, a structural, or a more petrologically oriented account (e.g. PARK & CRESS-WELL, 1973;ESCHER et al, 1976;HAGESKOV, 1985;WALKER, 1987;ROGERS & BIRD, 1987;SHELLEY, 1988;RYAN, 1988;HUANG, 1988;FOLEY, 1989). Other papers present theoretical mechanical models based upon specific dyke geometries (e.g.…”

Section: Relation To Other Workmentioning

confidence: 99%

A classification of dyke-fracture geometry with examples from Precambrian dyke swarms in the Vestfold Hills, Antarctica

Hoek

1991

Geol Rundsch

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ZusammenfassungEine Klassifizierung der Geometrie von Dilatationsbrtichen wird vorgeschlagen. Sie wird angewendet auf Strukturen die charakterisiert werden k6nnen als die Kombination eines Bruchsystems und eines Dilatationsvektorfeldes. Die Klassifizierung wird illustriert dutch Beispiele von magmatischen Gfingen, Pegmatitien und Pseudotachyliten. Segmentierung in Form yon Vers~itzen, StoBfugen oder Gabelungen sind hfiufig in vielen Bruchsystemen. Vier Grundtypen von Dilatationsbruchsystemen k6nnen an Hand der Segmentierungsgeometile unterschieden werden, diese sind: Unregelm~i-gige -, verzweigte -, kulissenf6rmige -und zickzack Typen. Die Zickzack-Bruchsysteme werden weiter untergliedert. Sie bestehen aus neu gebildeten sich schief ausdehenden Brtichen, oder aber aus bereits bestehenden Flfichen des Muttergesteins, welche yon der schiefen Erweiterung reaktiviert wurden. Dies ist die erste Ver6ffentlichung, die von magmatischen Zickzack-Gfingen berichtet, die neu geformte Brtiche entwickeln.Die AbstractA classification of dilational fracture geometry is proposed. It applies to structures that can be characterized by the combination of a fracture system and a dilation vector field. The classification is illustrated with examples of igneous dykes, pegmatites, and pseudotachylites. Segmentation in the form of offsets, jogs, or bifurcations is common to most fracture systems. Four basic types of dilational fracture systems are distinguished on the basis of the geometry of segmentation. These are: irregular, braided, en-echelon, and zigzag. Zigzag fracture systems are further differentiated. They consist of newly formed, obliquely dilated fractures or, alternatively, of pre-existing planes in the host-rock that are reactivated by oblique dilation. This paper is the first to actually report an igneous zigzag-dyke involving newly formed fractures.Rotation of the regional stress field in the direction of propagation leads to en-echelon segmentation. Braided fracture systems reflect high local stress-intensities, probably related to propagation rate. Two possibilities exist for the formation of zigzag dykes consisting of newly formed fractures that are obliquely dilated. They may form by extreme interaction of tensile fracture segments in a regional stress field with a low differential stress. Alternatively, they may form in a regional stress field with high differential stress through the propagation of shear fractures.Segmentation of dykes, characterized by offsets, is common. Such segmentation can be the result of protrusions of the fracture termination. Offsets also occur where a dyke cuts an older planar structure. Such offsets are the result of the local inhibition of fracture propagation. The resulting apparent offset can lead to a misinterpretation of relative age.Apophyses form as a result of the dilation of a segmented fracture system. R6sum6Cette note propose une classification des fractures de dilatation, basge sur leur g6om6trie. Elle s'applique aux structures que l'on peut caractdriser par la combinaison d'...

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“…Outcrop studies of injected sandstones have been devoted to geometrical analysis of dykes and sills (e.g. Winslow 1983;Huang 1988;Jolly et al 1998). Outcrop-based studies combined with diagenetic studies are seemingly absent in the literature.…”

mentioning

confidence: 99%

The structural and diagenetic evolution of injected sandstones: examples from the Kimmeridgian of NE Scotland

Jonk

Duranti

Parnell

et al. 2003

JGS

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Injected sandstones occurring in the Kimmeridgian of NE Scotland along the bounding Great Glen and Helmsdale faults formed when basinal fluids moved upward along the fault zones, fluidizing Oxfordian sands encountered at shallow depth and injecting them into overlying Kimmeridgian strata. The orientation of dykes, in addition to coeval faults and fractures, was controlled by a stress state related to dextral strike-slip along the bounding fault zones. Diagenetic studies of cements allow the reconstruction of the fluid flow history. The origin of deformation bands in sandstone dykes and sills was related to the contraction of the host-rocks against dyke and sill walls following the initial stage of fluidized flow, and these deformation bands are the earliest diagenetic imprint. Early non-ferroan calcite precipitated in injection structures at temperatures between 70 and 100 8C, indicating that it precipitated from relatively hot basinal fluids that drove injection. Coeval calcite-filled fractures show similar temperatures, suggesting that relatively hot fluids were responsible for calcite precipitation in any permeable pathway created by dextral simple shear along the faults. During progressive burial, percolating sea water was responsible for completely cementing the still relatively porous injected sandstones with a second generation of ferroan calcite, which contains fluid inclusions with homogenization temperatures below 50 8C. During this phase, depositional host sandstones were also cemented.

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Geometry and tectonic significance of Albian sedimentary dykes in the Sisteron area, SE France

Cited by 28 publications

References 11 publications

Sand injectites network as a marker of the palaeo–stress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France

Sand injectites network as a marker of the palaeo–stress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France

A classification of dyke-fracture geometry with examples from Precambrian dyke swarms in the Vestfold Hills, Antarctica

The structural and diagenetic evolution of injected sandstones: examples from the Kimmeridgian of NE Scotland

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