The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Gabriel Tobie - One of the best experts on this subject based on the ideXlab platform.
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Tectonics of Enceladus’ South Pole: Block Rotation of the Tiger Stripes
Journal of Geophysical Research. Planets, 2020Co-Authors: Costanza Rossi, Paola Cianfarra, Francesco Salvini, Olivier Bourgeois, Gabriel TobieAbstract:• Tectonic activity at Enceladus' south pole is consistent with clockwise Block Rotation tectonics. • Regional right-lateral strike-slip kinematics induces transtensional and transpressional regimes in the south polar region. • An evolutionary tectonic model is proposed for the past, present and future settings of Enceladus' south polar structures.
Guido Schreurs - One of the best experts on this subject based on the ideXlab platform.
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Experiments on strike-slip faulting and Block Rotation
Geology, 1994Co-Authors: Guido SchreursAbstract:Analogue model experiments investigating strike-slip faulting in zones of distributed shear deformation show that fault orientations and fault evolution indicate modifications of the stress field with increasing bulk shear strain. Dextral bulk shear deformation at low strain is accommodated dominantly by synthetic strike-slip faults (Riedel shears). At higher strain, secondary antithetic and synthetic faults develop mostly between earlier formed major Riedel shears. Closely spaced parallel antithetic faults (cross faults) delimit domains that rotate about vertical axes with continuing shear deformation. Rotation of fault-bounded domains results in sigmoidal antithetic faults that have a dip-slip component and a dip direction that changes along strike. There is good agreement between models and natural examples of distributed shear zones where Block Rotations about vertical axes have been documented.
Drew Mayerson - One of the best experts on this subject based on the ideXlab platform.
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Block Rotation AND TERMINATION OF THE HOSGRI STRIKE-SLIP FAULT, CALIFORNIA, FROM THREE-DIMENSIONAL MAP RESTORATION
Geology, 1999Co-Authors: Christopher C. Sorlien, Marc J. Kamerling, Drew MayersonAbstract:The Hosgri fault is located immediately offshore of south-central California and is part of the transform boundary between the Pacific and North American plates. This fault terminates to the southeast into east-trending folds and reverse-separation faults of the western Transverse Ranges. Our new structure-contour maps of deformed horizons show a spatial relationship between faulting and folding consistent with right-lateral slip. Restoration of these digital maps quantifies post-Miocene right-lateral slip across the southern Hosgri fault to be 3.5 km. This slip is absorbed by folding, thrust overlap, and clockwise vertical-axis Rotation of elongate Blocks between strands of the fault. The restored part of a Block located to the east has rotated 8° clockwise. Extrapolating this restored Rotation to the 50 km Block length produces an estimate of 7 km of dextral shear for a total, including the 3.5 km fault slip, of 10.5 km of post-Miocene displacement. Our three-dimensional approach precludes interpretations for reverse slip on the Hosgri fault, and is not consistent with models for more than 80 km of late Cenozoic right-lateral fault slip.
Costanza Rossi - One of the best experts on this subject based on the ideXlab platform.
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Tectonics of Enceladus’ South Pole: Block Rotation of the Tiger Stripes
Journal of Geophysical Research. Planets, 2020Co-Authors: Costanza Rossi, Paola Cianfarra, Francesco Salvini, Olivier Bourgeois, Gabriel TobieAbstract:• Tectonic activity at Enceladus' south pole is consistent with clockwise Block Rotation tectonics. • Regional right-lateral strike-slip kinematics induces transtensional and transpressional regimes in the south polar region. • An evolutionary tectonic model is proposed for the past, present and future settings of Enceladus' south polar structures.
Joseph F Engeln - One of the best experts on this subject based on the ideXlab platform.
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Block Rotation and continental extension in afar a comparison to oceanic microplate systems
Tectonics, 1991Co-Authors: Gary D Acton, Seth Stein, Joseph F EngelnAbstract:The reorganization of oceanic spreading centers separating major plates often appears to occur by a process in which discrete microplates form and evolve by rift propagation. To see whether such microplate behavior has implications for continental rifting, we investigate the application of a microplate model to the Afar region at the Nubia-Somalia-Arabia triple junction. Studies of marine magnetic anomalies, volcanic ages, bathymetry, and seismicity suggest that the westward propagating Gulf of Aden spreading center has propagated into eastern Afar within the past 2 m.y., causing rifting and extension within the continent. We derive constraints on the extension history from the geometry and timing of rift formation and from paleomagnetic data indicating that Pliocene to Pleistocene age rocks have undergone a clockwise Rotation of ∼11°. We suggest that the history of rifting, the Rotation, and several other features of the regional geology can be described by combining features of an oceanic microplate model and the concept of rift localization previously proposed for Afar. In this scenario, motion occurring on several rifts within an extensional zone preceding the propagating spreading center is gradually transferred to a single rift. While motion is transferred, the overlap region between the growing and dying rifts acts as one or more microplates or Blocks that rotate relative to the surrounding major plates. The rifting history and Rotations in eastern Afar are thus related to the rift propagation and localization that occurs as the plate boundary evolves. Provided the constraints we use are appropriate, our model better describes the regional kinematics than alternative Block models including one based on “bookshelf” faulting. If the tectonics of Afar are typical for continental breakup, they have interesting implications for the geometry of passive margins. In particular, asymmetric rifted margins can be produced if the final location of the rift axis is not at the center of the zone of initially disrupted lithosphere. Additionally, if the rate of rift propagation and the rate and location of rift localization are not uniform, then along-axis structural variations will result.