1,721,114 research outputs found
Orogenesis and Subduction in Analogue Models: Expressions of lateral subduction polarity change below the Alps
Get PDFCloetingh, S.A.P.L. [Promotor]Willingshofer, E. [Copromotor]Sokoutis, D. [Copromotor
Quaternary volcano-tectonic activity in the Soddo region, western margin of the Southern Main Ethiopian Rift
No full textWe present an analysis of the distribution, timing, and characteristics of the volcano-tectonic activity on the western margin of the Southern Main Ethiopian Rift in the
Soddo area (latitudes between ~7°10'N and ~6°30'N). The margin is characterized by the presence of numerous normal faults, with limited vertical offset and often sigmoidal in shape, which accommodate a gentle transition from the rift floor to the Ethiopian plateau. New radiocarbon dating indicates post-30 ka fault activity, pointing to a significant Late Pleistocene-Holocene tectonic activity of the Soddo margin. Comparison of the fault architecture with analog models suggests that deformation has been controlled by a sub-E-W (roughly N100°E) extension direction, resulting in an oblique extension with respect to the roughly NE-SW-trending rift. This well accords with inversion of fault slip data collected on faults with Pleistocene-Holocene activity and is also in good agreement with recent GPS data from the Southern Main Ethiopian Rift. Our data support a close correlation between the recent volcanic activity and deformation in the study area, with eruptive vents located along the recent border faults; the axial tectono-magmatic activity is subordinate in the area. These findings support a transition from axial tectono-magmatic deformation in the Northern Main
Ethiopian Rift to marginal deformation in the Central and Southern Main Ethiopian Rift, in turn indicating an along-axis, north to south decrease in rift maturity
Dynamics of magma emplacement in centrifuge models of continental extension with implications for flank volcanism
No full textTransition from continental break-up to punctiform seafloor spreading: How fast, symmetric and magmatic
No full textInsights from scaled analogue modelling into the seismotectonics of the Iranian region
No full textWe show how analogue modelling provides insights into complex crustal block kinematics and the seismotectonics of active areas undergoing contraction, such as the Iranian region. The seismotectonic model deriving from this analysis is consistent with partitioning of the N-directed Arabia indentation into a composite system of collision-oblique and collision-parallel seismogenetic belts. These features include (1) two main conjugate transpressive belts (the dextral NW-SE-trending Zagros belt and the NE-SW-trending sinistral Elburz-Aran-Torud (EAT) belt), and (2) a modest lateral escape of Central Iran towards the Lut block along the Nayband belt. This cinematic model fits the seismic activity and the current fault pattern of the region. Also, the velocity field scaled from the model to nature shows a good similarity with previous numerical modelling as well as with deformation rates along the first-order seismogenetic belts determined by plate tectonic models and GPS data. © 2003 Elsevier B.V. All rights reserved
Analogue modelling of continental extension: a review focused on the relations between the patterns of deformation and the presence of magma
No full textContinental rift architecture and pattern of magma migration: A dynamic analysis based on centrifuge models
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