Analogue models of folds above a wrench fault

Odonne, Francis; Vialon, P.

doi:10.1016/0040-1951(83)90168-3

Cited by 75 publications

(31 citation statements)

References 15 publications

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“…The present-day compressive deformation is restricted to the relay zones of the Oriente Fault. Moreover, the smooth folding that we observed can be explained in the frame of pure strikeslip motion, as shown by analog tectonic models (Odonne and Vialon, 1983;Richard and Cobbold, 1989;Sylvester, 1989). We believe that the amount of convergence predicted by the kinematic models is too large to be attributed to the small amount of compressive deformation observed along the Oriente Fault across the Windward Passage.…”

Section: -' Lo V--s T R I K E -S L I P T E C T O N I C P R O C E S Smentioning

confidence: 64%

Strike-slip tectonic processes in the northern Caribbean between Cuba and Hispaniola (Windward Passage)

Calais

Lépinay

1995

Mar Geophys Res

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Section: -' Lo V--s T R I K E -S L I P T E C T O N I C P R O C E S Smentioning

confidence: 64%

Strike-slip tectonic processes in the northern Caribbean between Cuba and Hispaniola (Windward Passage)

Calais

Lépinay

1995

Mar Geophys Res

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“…However, the fold axes trend north-south, except close to the bounding faults, where they curve and become parallel to the faults. Within individual tectonic strips, the pattern of north-south-trending sets of folds that never straddle the northeast-trending bounding faults results in a right-stepping en echelon style, which is consistent with dextral movement on the bounding faults (Dibblee 1977;Odonne & Vialon 1983).…”

Section: Kinematics Of Faultingmentioning

confidence: 70%

Early Miocene thin‐skinned tectonics and wrench faulting in the Pongaroa district, Hikurangi margin, North Island, New Zealand

Delteil

Morgans

Raine

et al. 1996

New Zealand Journal of Geology and Geophysics

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“…Carbopol is well studied and widely used as rheology modifier in industry 16,31,32 . We hydrate the dry gel resins with deionized water, which leads to a swelling of the resins and the formation of hydrated gels.…”

Section: Materialmentioning

confidence: 99%

Experimental demonstration of a semi-brittle origin for crustal strain transients

2015

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Tectonic motions give rise to destructive earthquakes and transient slip events. These movements are often described by friction laws for stick-slip motion on brittle fault surfaces and gouge-filled zones 1,2 . Yet, many transient slip events, such as slow earthquakes and aseismic creep, occur in rocks that exhibit mixed brittle-ductile rheology, where these friction laws are not clearly applicable 3,4 . Here we describe the flow and evolution of fractures as observed in a semi-brittle rock analogue exposed to shear stress in laboratory experiments. We find that, depending on the strength of the rock-analogue material, and thus the magnitude of yield stress, the material exhibits either creep-like or stick-slip behaviour. At low yield stress, deformation occurs as constant creep along a main fracture, whereas at high yield stress, the material exhibits stick-slip behaviour. However, the deformation does not involve frictional behaviour; it is instead accommodated by the initiation and growth of a system of tensional and shear fractures. The opening and interplay of such fracture systems could generate tectonic tremor and slow slip. Our laboratory experiments thus support a frictionless alternative mechanism for the development of tectonic strain transients.Semi-brittle deformation in geologic systems is generally defined micromechanically 5-7 , wherein fracturing and/or frictional sliding characterizes the deformation of one mineral phase while another flows through viscous deformation mechanisms. In the resulting meso-scale deformation, rather than accommodate strain via a single, brittle shear fracture or continuous, ductile creep, there is a combination of both brittle and ductile deformation. Field observations of semi-brittle rocks show that for a range of composition, temperature and pressure, the formation of fluid-filled brittle fractures and veins accompanies localized ductile flow 3,4,8 . At the scale of the lithosphere, the transition from brittle to ductile deformation is highly temperature-sensitive, and thus such semibrittle deformation is particularly important at a depth interval in the lithosphere near the base of the seismogenic zone referred to as the brittle-to-ductile transition (BDT; refs 6,7). A wide variety of slip behaviours have been geophysically resolved to originate in the BDT, and observations and physical experiments of semibrittle materials show that the coexistence of brittle and viscous behaviour gives emergence to some of the characteristics of strain transients and slow slip events 9-11 . However, most workers explain differences in slip transients with laws that describe how fluid pressure, temperature changes and friction interact 12 . Here, we explore an alternative mechanism where strain transients ranging from stick-slip to creep can be explained by the co-occurrence of brittle and ductile deformation.Semi-brittle deformation has been studied in a variety of rock mechanics experiments 5,13 . Although constraining flow laws under laboratory conditions, these experiments are...

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Analogue models of folds above a wrench fault

Cited by 75 publications

References 15 publications

Strike-slip tectonic processes in the northern Caribbean between Cuba and Hispaniola (Windward Passage)

Strike-slip tectonic processes in the northern Caribbean between Cuba and Hispaniola (Windward Passage)

Early Miocene thin‐skinned tectonics and wrench faulting in the Pongaroa district, Hikurangi margin, North Island, New Zealand

Experimental demonstration of a semi-brittle origin for crustal strain transients

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