Geomechanics of the South Furious field. An integrated approach towards solving complex structural geological problems, including analogue and finite-element modelling

Nieuwland, D.A.; Walters, John Victor

doi:10.1016/0040-1951(93)90115-z

Cited by 12 publications

(4 citation statements)

References 7 publications

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“…Though the development of normal faulting on the rear of an active thrust [e.g., Migliorini , 1948] is relatively uncommon, this structural association has been documented in some areas worldwide [e.g., Fox , 1983; Liu , 1993; Nieuwland and Walters , 1993], as well as in other sectors of the buried external northern Apennines [ Pieri and Groppi , 1981] where it has been interpreted as expulsion wedges [ Castellarin et al , 1985]. Possibly, such a configuration is also favored by a marked vertical fold uplift, which may be triggered by pseudodiapiric processes [e.g., Fox , 1983; Nieuwland and Walters , 1993] in which shales (or evaporites) are intruded vertically above the tips of nominal blind ductile thrusts in the anticlinal cores. Moreover, in antiformal stack settings such as the Pede‐Apennine thrust system, the uplift localized by a deep thrust may also contribute to the development of normal faulting on the rear of a shallower thrust fold.…”

Section: External Northern Apennines Beltmentioning

confidence: 99%

“…Thus thrust folds of the type described in the Regnano area may be interpreted as being associated with a local extensional regime, which implies the occurrence of a severe stress field compartmentalization. The σ 1 axis is inferred to be subvertical over the backlimb and fold crest region and subhorizontal in the forelimb area [e.g., Nieuwland and Walters , 1993]. Consequently, the vertical σ 1 may promote the development, or the reactivation, of steep extensional brittle features that are expected to favor a vertical fluid escape.…”

Section: Structural and Rheological Controls On Fluid Ventingmentioning

confidence: 99%

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Interrelations of mud volcanism, fluid venting, and thrust‐anticline folding: Examples from the external northern Apennines (Emilia‐Romagna, Italy)

Bonini

2007

J. Geophys. Res.

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[1] The present work aims to provide an example of connection between fluid seepage and fault/fracture zones associated with compressional thrust folds. Surface fluid seepage along the Pede-Apennine margin consists of mud volcanism and methane-rich emissions showing an intimate link with thrust-related folds. Dominant gaseous or CH 4 -bearing fluid emissions characterize thrust fold settings in which fluid escape from the main reservoir and source rock (i.e., the Marnoso Arenacea flysch) is not impeded by a seal layer. Conversely, remarkable mud volcanism is closely linked to the presence of the impermeable Ligurian units sealing the Marnoso Arenacea reservoir. Structural analyses focused on selected thrust folds exhibiting clear relations between surface seepage and brittle elements associated with the fold. Various scenarios potentially explaining mud volcanism and venting over the crestal region of the thrust-related folds are discussed with respect to fluid pressure state and the development of second-order fault and fracture sets that are observed to control surface fluid expulsion. It is proposed that mud volcanism can be potentially triggered by first-order fault failure cycles during which the overpressured fluid is released during faulting events. Past anomalous eruptions associated with strong earthquakes seem to support this hypothesis. The relatively quiescent but continuous activity of the current Pede-Apennine mud volcanoes could instead reflect a short-lived leakage of overpressured fluids along permeable fractures/faults. Expansion of methane contained in the rising mud may assist this process fundamentally.

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Section: External Northern Apennines Beltmentioning

confidence: 99%

Section: Structural and Rheological Controls On Fluid Ventingmentioning

confidence: 99%

Interrelations of mud volcanism, fluid venting, and thrust‐anticline folding: Examples from the external northern Apennines (Emilia‐Romagna, Italy)

Bonini

2007

J. Geophys. Res.

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“…Understanding the kinematics of folded structures in sedimentary basins from 2D cross-sections based on the area balance assumption (Suppe, 1985;Mercier et al, 1997), has been a prerequisite for the improvement of predicted fracture networks despite the complete absence of any stress prediction. A fundamentally different approach consists of proposing a mechanical model of the folding and of using a numerical scheme such as the finite-element method (Nieuwland and Walters, 1993;Sassi and Faure, 1997). The advantages of the kinematic and the mechanical approaches can be combined as follows.…”

Section: Introductionmentioning

confidence: 99%

Mechanical constraints on the chronology of fracture activation in folded Devonian sandstone of the western Moroccan Anti-Atlas

Guiton

Sassi

Leroy

et al. 2003

Journal of Structural Geology

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The three-dimensional meter-scale fracture networks, observed on exposed folds between the towns of Tata and Akka, western Moroccan Anti-Atlas, consist mostly of planar discontinuities, which are sub-perpendicular to the bedding and partitioned in three main sets. The chronology of their activation is proposed in five stages since the Hercynian orogeny. Stage 1 predates folding and involves the horizontal compression of the Emsian sandstone. It involves fracture set I, composed of systematic joints parallel to the direction of compression. Stages 2-4 correspond to the folding and are marked in the outer-arc by the activation of fracture set II, composed mainly of joints parallel to the fold axial plane. Stage 5 is a regional shear event during which sets I and III, separated by an angle close to 608, are activated in a conjugate manner. To throw light on the recurrent difficulty in discriminating between activation of inherited and new fractures, an elasto-plastic model is used to construct a stress path in the pervasively fractured medium idealized as a continuum. Each fracture set obeys the Mohr-Coulomb criterion truncated in tension to describe both sliding and opening activations. Finite-element simulations of a simple buckling event accounting for the field fracture sets are presented. It is shown that set I cannot be generated by folding and thus does belong to stage 1. Set II is activated at a later stage of folding than expected from the field interpretation. Set III cannot be activated during stage 2, confirming its role in stage 5. The advantages and limitations of the proposed modeling are finally discussed.

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“…Thi s tear fault is a crestal collapse fault which develop in the crest of the anticline and accomadate extension in the hinge region [39,40,48,49]. This fault is normal which both folding and collapse fault develop synchronously [50). Morphometry study of a drainage basin (figure 13) indicates that active erosion of the transverse fault scarp is associated with a valley floor width to height index (Vf, table 1) as high as 2.06, but, in the inactive Changhua thrust area, the Vf is as low as 0.22 ( figure 13C).…”

Section: Geomorphic Response To Active Tectonics Of Oblique Fault Scarpsmentioning

confidence: 99%

Geomorphic response to growing fault-related folds: example from the foothills of central Taiwan

Delcaillau

2001

Geodinamica Acta

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-In thi s paper we concentrate particul arly on the geoOrphological indicators left by active tectonics. In the central foo tllls of Taiwan, we used topography, drainage pattern and structural data to perform qu antitati ve morphometric analysis and to determine relati ve age of fault-related anticlines. The Tiehchen, Tatu ~d Pak:ua ridge belt is a fa ult-related anticline system located in f e hanging wall of the Changhua fault along the western thrust rant of the foothill s. Geomorphic systems are analysed with intent to detect the various responses of landforms and drainage pattern ~0 late Quaternary deform ation. Topography and drainage basin regI~ter uplift and are valuable tool s to discriminate lateral propagation.of an active frontal fold. Geomorphic field evidence and quantt~attve morphometri c parameters are used to define the evolution 0 ~he ri sing anticline ridges and to infer tectoni sm style along an active front. Geometry of alluvial fans, formed along the frontal Side of the anticlines, and weathered terrace deposits provide relevant information on neotectonics. Knowledge concerning these yo~nger anticline ridges, makes thi s area a good example of an ~cl! vely formin g mountain front. We di scuss in detai l the origin of

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Geomechanics of the South Furious field. An integrated approach towards solving complex structural geological problems, including analogue and finite-element modelling

Cited by 12 publications

References 7 publications

Interrelations of mud volcanism, fluid venting, and thrust‐anticline folding: Examples from the external northern Apennines (Emilia‐Romagna, Italy)

Interrelations of mud volcanism, fluid venting, and thrust‐anticline folding: Examples from the external northern Apennines (Emilia‐Romagna, Italy)

Mechanical constraints on the chronology of fracture activation in folded Devonian sandstone of the western Moroccan Anti-Atlas

Geomorphic response to growing fault-related folds: example from the foothills of central Taiwan

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