scholarly journals Stress Field Evolution of the Southernmost Andean Cordillera From Paleostress Analysis (Argentine Tierra del Fuego)

Tectonics ◽  
2019 ◽  
Vol 38 (1) ◽  
pp. 7-25 ◽  
Author(s):  
A. Maestro ◽  
P. Ruano ◽  
P. Torres Carbonell ◽  
F. Bohoyo ◽  
J. Galindo-Zaldívar ◽  
...  
Keyword(s):  
Stress Field ◽  
Tierra Del Fuego ◽  
Andean Cordillera ◽  
Field Evolution ◽  
Paleostress Analysis

Stress Field Evolution in a Ball Bearing Raceway Fatigue Spall

2010 ◽  
pp. 57-57-24 ◽  
Author(s):  
Nathan A. Branch ◽  
Nagaraj K. Arakere ◽  
Vaughn Svendsen ◽  
Nelson H. Forster
Keyword(s):  
Stress Field ◽  
Ball Bearing ◽  
Field Evolution ◽  
Bearing Raceway

The conversion tectonics from spreading to subduction: Paleostress analysis of dike swarms during the subduction initiation in the Oman Ophiolite

2019 ◽  
Vol 132 (5-6) ◽  
pp. 1333-1343 ◽  
Author(s):  
Susumu Umino ◽  
Yuki Kusano ◽  
Atsushi Yamaji ◽  
Takahiro Fudai ◽  
Akihiro Tamura ◽  
...  
Keyword(s):  
Stress Field ◽  
Clockwise Rotation ◽  
Oman Ophiolite ◽  
Subduction Initiation ◽  
Mid Ocean Ridge ◽  
Abrupt Changes ◽  
Rift Zones ◽  
Dike Swarms ◽  
Ocean Ridge ◽  
Paleostress Analysis

Abstract We present paleostress analyses of dike swarms intruded during the subduction initiation in the northern Oman Ophiolite to understand the tectonomagmatic environment. Five swarms of subparallel dikes extending WNW-ESE are 1–5 km in width and are spaced every 5 km N-S. Each swarm has a core of 100% sheeted dikes 1–2 km in width, which emanated from the dunite-wherlite-clinopyroxenite-gabbronorite-diorite-tonalite complexes below and intruded through V1 and into V2 extrusive rocks. Individual dike strikes are varied but generally subparallel to the overall trend of the swarm. Paleostress analyses indicate subvertical σ1, ∼σ2, and subhorizontal σ3 with high magma pressures, resulted in the mutually intrusive, extensional shear dikes and abrupt changes in dike strike at high angles. These occurrences suggest intrusions under a more compressive environment compared to the extensional stress field that formed the N-S–striking sheeted dikes of V1 spreading stage. Most E-W–striking dikes possess both boninitic and tholeiitic geochemistry. The latter resemble the V1 flows and dikes with affinities of mid-ocean ridge basalt. Some tholeiitic dikes strike N-S, which are mutually intrusive to E-W–striking dikes. Tholeiitic dikes are more intensely altered than boninite, suggesting their older ages. Conversion of the stress field from a N-S–running spreading axis to inextensional E-W–running rift zones associated with the change in magma geochemistry agree with the relatively compressive V2 arc above a forced subduction zone, which originated from intraoceanic thrusting caused by the clockwise rotation of a microplate including the future northern ophiolite.

Inversion tectonics, intracontinental fold-and-thrust belts and complex stress fields in central Europe: the history of the Franconian Basin revealed by paleostress analysis, geological maps and field observations.

2020 ◽  
Author(s):  
Saskia Köhler ◽  
Florian Duschl ◽  
Hamed Fazlikhani ◽  
Daniel Köhn
Keyword(s):  
Stress Field ◽  
Late Cretaceous ◽  
Complex Stress ◽  
Strike Slip ◽  
Stress Fields ◽  
Thrust Belt ◽  
Slip Regime ◽  
Geological Maps ◽  
Fold And Thrust Belt ◽  
Paleostress Analysis

<p>The Franconian Basin in SE Germany has seen a complex stress history indicative of several extensional and compressional phases e.g. the Iberia-Europe collision acting on a pre-faulted Variscan basement. Early Cretaceous extension is followed by Late Cretaceous inversion with syntectonic sedimentation and deformation increasing progressively from SW to NE culminating in the Franconian Line where basement rocks are thrusted over the Mesozoic cover. The development of this intracontinental fold-and-thrust belt is followed by Paleogene extension associated with the formation of the Eger Graben, which is then succeeded by a new compressional event as a consequence of the Alpine orogeny.</p><p>We use existing data from literature and geological maps and new field data to construct balanced cross-sections in order to reveal the architecture of the Cretaceous fold-and-thrust belt. In addition, we undertake paleostress analysis using a combination of fault slip information, veins and tectonic and sedimentary stylolites to identify stress events in the study area, as well as their nature and timing. Furthermore, we try to understand how basement faults influence younger faults in the cover sequence.</p><p>Our paleostress data indicates that at least five different stress events existed in Mesozoic to Cenozoic times (from old to young): (1) an N-S directed extensional stress field with E-W striking normal faults, (2) a NNE-SSW directed compressional stress field causing thrusting and folding of the cover sequence, (3) a strike slip regime with NE-SW compression and NW-SE extension, (4) an extensional event with NW-SE extension and the formation of ENE-WSW striking faults according to the formation of the Eger Graben in the E, and finally (5) a strike slip regime with NW-SE compression and NE-SW extension related to Alpine stresses. The geometry of faulting and deformation varies significantly over the regions with respect to the influence of and distance to inherited Variscan structures.</p><p>We argue that the extensional event of stress field (1) provides spacing for Early Cretaceous sedimentation in the Franconian Basin. This is followed by the creation of an intracontinental fold-and-thrust belt during stress fields (2) and (3) with a slight rotation of the main compressive stress during these events in Late Cretaceous. We associate the following extension to the development of the Eger Graben in Miocene time. Finally, a NW-SE directed compression related to Alpine stresses in an intracontinental strike-slip regime is following. Reconstruction of the Cretaceous fold-and-thrust belt reveals mainly fault propagation folding with deep detachments sitting below the cover sequence indicating thick-skinned tectonics. We argue that the Franconian Line is a thrust with a steeply dipping root that belongs to the same fold-and-thrust belt.</p>

Stress Field Evolution under Mechanically Simulated Hull Slamming Conditions

2011 ◽  
Vol 52 (1) ◽  
pp. 107-116 ◽  
Author(s):  
M. L. Silva ◽  
G. Ravichandran
Keyword(s):  
Stress Field ◽  
Field Evolution ◽  
Hull Slamming

scholarly journals Neogene to Quaternary stress field evolution in Lesser Caucasus and adjacent regions using fault kinematics analysis and volcanic cluster data

2005 ◽  
Vol 18 (6) ◽  
pp. 401-416 ◽  
Author(s):  
Ara Avagyan ◽  
Marc Sosson ◽  
Herve Philip ◽  
Arkadi Karakhanian ◽  
Yann Rolland ◽  
...  
Keyword(s):  
Stress Field ◽  
Kinematics Analysis ◽  
Field Evolution ◽  
Cluster Data ◽  
Fault Kinematics ◽  
Lesser Caucasus
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