Tectonics

Journal Information
ISSN / EISSN : 02787407 / 19449194
Current Publisher: American Geophysical Union (AGU) (10.1029)
Former Publisher: Wiley (10.1002)
Total articles ≅ 3,524
Google Scholar h5-index: 40
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Lachlan J.M. Wright, James D. Muirhead, Christopher A. Scholz
Published: 25 February 2020
Tectonics; doi:10.1029/2019tc006019

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A. Delorme, R. Grandin, Y. Klinger, M. Pierrot‐Deseilligny, N. Feuillet, E. Jacques, E. Rupnik, Y. Morishita
Published: 23 February 2020
Tectonics, Volume 39; doi:10.1029/2019tc005596

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Haibo Yang, Xiaoping Yang, Dickson Cunningham, Zongkai Hu, Xiongnan Huang, Weiliang Huang, Huili Yang, Shuqing Miao, Ling Zhang
Published: 23 February 2020
Tectonics, Volume 39; doi:10.1029/2019tc005749

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Andrea R. Biedermann, Mike Jackson, Michele D. Stillinger, Dario Bilardello, Joshua M. Feinberg
Published: 22 February 2020
Tectonics, Volume 39; doi:10.1029/2018tc005284

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D. Orr, R. Sutherland, W.R. Stratford
Published: 21 February 2020
Tectonics, Volume 39; doi:10.1029/2019tc005899

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X. P. Yuan, J.‐A. Olive, J. Braun
Published: 21 February 2020
Tectonics, Volume 39; doi:10.1029/2019tc005753

Abstract:It is well established that slip on a frictionally‐weak low‐angle normal fault (LANF) can be more favorable than breaking a steep fault in strong crust. Very few studies, however, have considered the specific effect of crust and fault cohesion on LANF viability. We do so using Limit Analysis, a methodology for predicting the optimal orientation of faults with varying strength subjected to a specific set of boundary conditions. Accounting for crustal cohesion in our models reduces the lowest admissible LANF dip, and even allows slip on high‐friction LANFs if the contrast between crust and fault cohesion is large. Fault cohesion, however, increases the lowest admissible LANF dip, and introduces a locking depth above which LANF slip is not mechanically feasible. This is consistent with observations of steep splay faults rooting onto LANFs in a variety of settings. We further demonstrate that locking depth can help constrain LANF cohesion, friction, and fluid pressure on the Alto Tiberina (Italy) and western Corinth (Greece) LANFs. Specifically, assuming a measured fault friction of 0.2‐‐0.3, we find that the shallow locking depth of the Alto Tiberina fault requires either (1) moderate fluid overpressure (57% of lithostatic) with 8‐‐12 MPa of cohesion, or (2) strong overpressure 77% of lithostatic) with 13‐‐20 MPa of cohesion along the fault. By contrast, the larger locking depth characterizing the western Corinth LANF can reflect greater fault cohesion.
A. G. Petrunin, M. K. Kaban, S. El Khrepy, N. Al-Arifi
Published: 21 February 2020
Tectonics, Volume 39; doi:10.1029/2019tc005829

Abstract:We present a new model of the stress state and present‐day tectonics of the Red Sea Rift (RSR) based on an instantaneous geodynamic mantle flow model. The initial density and viscosity variations in the mantle are derived from a joint inversion of gravity, residual topography and tomography, which provides higher resolution than existing models. The calculated mantle flow shows clear distinctions along the rift axis. The tectonics of the southern part of the Red Sea is mainly controlled by the Afar plume and characterized by divergent mantle flow. The passive rifting along the central part of the RSR can be explained either by asthenospheric upwelling due to the Red Sea floor spreading or by the plume, rising from the transition zone and not directly related to the Afar plume. We also observed ridge‐axis aligned flow in the uppermost mantle in the northern part of the RSR.
Philip Groß, Mark R. Handy, Timm John, Gerhard Pestal, Jan Pleuger
Published: 21 February 2020
Tectonics, Volume 39; doi:10.1029/2019tc005942

Abstract:We investigate a well‐preserved paleo subduction channel that preserves a coherent part of the European continental margin exposed in the central Tauern Window (Eastern Alps), with the aim of testing models of sheath fold nappe formation and exhumation. The subduction zone was active during Paleogene convergence of the European and Adriatic plates, after closure of the Alpine Tethyan ocean. New cross‐sections and structural data together with new petrological data document a recumbent, tens of kilometers‐scale sheath fold in the center of the Tauern Window that formed during pervasive top‐foreland shear while subducted at high‐pressure (HP) conditions (ca. 2.0 GPa, 500 °C) close to maximum burial depth. The fold comprises an isoclinally folded thrust that transported relicts of the former Alpine Tethys onto a distal part of the former European continental margin. The passive margin stratigraphy is still well preserved in the fold and highlights the special character of this segment of the European continental margin. We argue that this segment formed a promontory to the margin which was inherited from Mesozoic rifting. In accordance with classical sheath fold theory, this promontory may have acted as an initial structural perturbation to nucleate a fold that was passively amplified to a sheath fold during top‐foreland shear in the subduction zone. The fold was at least partly exhumed and juxtaposed with the surrounding lower‐pressure units by opposing top‐hinterland and top‐foreland shear zones above and below, respectively, i.e., in the sense of a nappe fold formed during channel‐extrusion exhumation.
Sabrina Metzger, Anatoly Ischuk, Zhiguo Deng, Lothar Ratschbacher, Mason Perry, Sofia‐Katerina Kufner, Rebecca Bendick, Marcos Moreno
Published: 20 February 2020
Tectonics, Volume 39; doi:10.1029/2019tc005797

Abstract:At the northwestern tip of the India‐Asia collision zone, the Pamir orocline overrides the Tajik Depression and the Tarim Basin and collides with the Tian Shan. Currently, the Pamir's northern edge exhibits localized shortening rates of 13‐19 mm/yr. While the eastern Pamir and the Tarim Basin move northward nearly en‐block, north‐south shortening decreases westward along the Pamir front into the Tajik Depression. In the northeastern Tajik Depression, the wedge‐shaped crustal sliver of the Peter the First Range is squeezed between the dextral‐transpressive Vakhsh and the sinistral‐transpressive Darvaz faults. GPS data collected along two densely surveyed profiles detail the kinematics of north‐south shortening and westward lateral extrusion in the northwestern Pamir. 2016 campaign data suggest a short‐duration dextral‐slip activation of the Darvaz fault, which we interpret as a far‐field effect triggered by the 2015, Mw7.2 Sarez, Central Pamir earthquake. 2013‐2015 interseismic GPS velocities and kinematic modeling show that the Darvaz fault zone accommodates ~15 mm/yr sinistral shear and ~10 mm/yr fault‐normal extension below a locking depth of 9.0 +0.4/‐1.1 km. The Vakhsh fault shows shortening rates of 15 +4/‐2 mm/yr and dextral shear rates of 16 +3/‐4 mm/yr. Jointly, these faults accommodate NW‐SE shortening and southwestward material flow out of the Peter the First Range into the Tajik Depression. Together with seismic and geologic data, our and published geodetic surveys showcase the prolonged interaction of shortening and lateral material flow out of a plateau margin.
R. Esmaeili, W. Xiao, W. L. Griffin, H. Shafaii Moghadam, Z. Zhang, M. Ebrahimi, J. Zhang, B. Wan, S. Ao, S. Bhandari
Published: 20 February 2020
Tectonics, Volume 39; doi:10.1029/2019tc005963

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