Formation, deformation and chertification of systematic clastic dykes in a differentially lithified carbonate multilayer. SW Iberia, Algarve Basin, Lower Jurassic

Ribeiro, Carlos; Terrinha, Pedro

doi:10.1016/j.sedgeo.2006.06.001

Cited by 18 publications

(13 citation statements)

References 27 publications

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“…Smyers and Peterson, 1971;Truswell, 1972;Hiscott, 1979;Hillier and Cosgrove, 2002;Hubbard et al, 2007;Cartwright et al, 2008;Monnier et al, 2014), sometimes downward (e.g. Gottis, 1953;Parize, 1988;Huang, 1988;Scholz, 2009Scholz, , 2010, and rarely in all directions (Philips and Alsop, 2000;Surlyk, 2001Surlyk, , 2007Rowe et al, 2002;Ribeiro et Terrinha, 2007). Based on the precise 3D architecture of the sand injectite network, we propose a new model of upward and lateral sand injection in the Vocontian basin consistent with other similar studies of sand injectites (Truswell, 1972;Hiscott, 1979;Levi, 2006;Hubbard et al, 2007;Jackson, 2007;Cartwright et al, 2008;Andresen et al, 2009;V etel and Cartwright, 2009;Kane, 2010).…”

Section: Models Of Sand Injectionmentioning

confidence: 99%

“…(b) Subtrusive injection occurs where rapid infill of unlithified sediments occurs into meter to kilometerescale deep fractures/faults suddenly opened or reeopened (mode I), either in an extensional regime (e.g. Vitanage, 1954;Harms, 1965;Rowe et al, 2002;Wall and Jenkyns, 2004;Ribeiro and Terrinha, 2007;Scholz et al, 2009Scholz et al, , 2010, or a compressional regime (Winslow, 1983;Philips and Alsop, 2000). The material is sucked into the fractures/faults as the opening of the fractures locally leads to underpressuring (Scholz et al, 2009).…”

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: Models Of Sand Injectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Rocha (1977) provides accurate descriptions and some photographic illustrations of ammonites properly situated in the Early Jurassic successions of the Algarve Basin. Since that work, only a few studies of the Early Jurassic of the Algarve Basin have been published and those are mainly about its structural and/or sedimentological features (e.g., Terrinha et al 2002;Ribeiro and Terrinha 2007). The present work is the first palaeontological publication about the Pliensbachian of the Algarve since Rocha's monograph (1977).…”

Section: Geographical and Geological Settingmentioning

confidence: 88%

The Pliensbachian ammonites of the Algarve Basin (Portugal) and their palaeobiogeographical significance for the “Iberia-Newfoundland” conjugate margins

2011

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A review of the Pliensbachian ammonite faunas of the Algarve Basin is given covering their taxonomy, stratigraphy and palaeobiogeography (palaeobiodiversity). This review is based on both an extensive revision of the previously collected and/or published material and on new finds precisely located within the ammonite succession. This new material allows us to clarify the variations within the most abundant species-a new species Reynesocoeloceras elmii nov. sp. is described-and to improve our understanding (palaeobiodiversity, palaeobiogeography and bio-or chrono-stratigraphy) of the two single known Pliensbachian fossiliferous assemblages in the Algarve Basin. The first of these assemblages is relatively diverse and is ascribed to the upper half of the Luridum Subchronozone. The second assemblage is less diversified and probably partly condensed. It is broadly attributed to the upper half of the Stokesi Subchronozone. Despite the newly collected ammonites and extensive prospecting, our knowledge of the Pliensbachian ammonite faunas of the Algarve remains fragmentary. Therefore, it is difficult to propose an incontrovertible extensive palaeobiogeographical interpretation for these faunas, but it seems that Tethyan (Mediterranean) affinities were of major importance whereas there were probably no NW European influences via the Lusitanian Basin.

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“…Silica leached from the Albian quartz sands might have migrated along the joints and faults (cf. Bukowy 1960;Caine et al 1996;Ribeiro and Terrinha 2007) and might have precipitated on the silicified limestones and on the early diagenetic cherts (cf. Matyszkiewicz 1987), both acting as crystallization nuclei.…”

Section: Discussionmentioning

confidence: 99%

Epigenetic silicification of the Upper Oxfordian limestones in the Sokole Hills (Kraków-Częstochowa Upland): relationship to facies development and tectonics

Matyszkiewicz¹,

Kochman²,

Rzepa³

et al. 2015

Acta Geologica Polonica

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ABSTRACT:Matyszkiewicz, J., Kochman, A., Rzepa, G., Gołębiowska, B., Krajewski, M., Gajdzik, K. and Żaba, J. 2015. Epigenetic silicification of the Upper Oxfordian limestones in the Sokole Hills (Kraków-Częstochowa Upland): relationship to facies development and tectonics. Acta Geologica Polonica, 65 (2), 181-203. Warszawa.A spectacular epigenetic silicification was encountered in the Oxfordian bedded limestones exposed in the Sokole Hills situated in the Kraków-Częstochowa Upland. The main epigenetic mineral is microcrystalline quartz accompanied by minor goethite, hematite, barite, galena and sphalerite. Locally, the mineralized limestones reveal Pb and Cu contents exceeding over 150 times the background values of these metals in unmineralized limestones.The epigenetic mineralization of the bedded limestones was probably a two-stage process. During the first, Early Cretaceous stage, silicified limestones formed at the erosional surface of a denuded carbonate complex. Such silicification greatly limited the progress of the first karstification phase of the Upper Jurassic carbonates initiated in the Hauterivian. The sources of silica accumulated in the limestones were descending solutions enriched in silica derived from the weathering zone. This silicification affected the topmost part of the Upper Jurassic massive limestones and the deeper portions of the bedded limestones along the fracture systems and stylolites.Early Cretaceous tectonic activity generated new dislocations and re-opened the existing faults, which were subsequently filled with permeable Albian quartz sands. These openings became the migration pathways for ascending, warm, relict, sulphide-carrying hydrothermal solutions at the second formation stage of the epigenetic mineralization. The newly supplied silica from the Albian sands precipitated on the silicified limestones and, as concentric rims, on brecciated, early diagenetic cherts. The second-stage mineralization proceeded under phreatic conditions, presumably close to a fluctuating mixing zone of ascending, warm hydrothermal solutions and descending cold groundwaters. The brecciated cherts acting as silica crystallization nuclei indicate that the last mineralization stage probably followed the final phase of Cenozoic faulting.

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Formation, deformation and chertification of systematic clastic dykes in a differentially lithified carbonate multilayer. SW Iberia, Algarve Basin, Lower Jurassic

Cited by 18 publications

References 27 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

The Pliensbachian ammonites of the Algarve Basin (Portugal) and their palaeobiogeographical significance for the “Iberia-Newfoundland” conjugate margins

Epigenetic silicification of the Upper Oxfordian limestones in the Sokole Hills (Kraków-Częstochowa Upland): relationship to facies development and tectonics

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