Fault plane solutions of intraplate earthquakes in brazil: Some constraints on the regional stress field

1985 ◽  
Vol 113 (3-4) ◽  
pp. 283-293 ◽  
Author(s):  
Marcelo Assumpçao ◽  
Gerardo Suarez ◽  
JoséAlberto Veloso
Keyword(s):  
Stress Field ◽  
Fault Plane ◽  
Intraplate Earthquakes ◽  
Fault Plane Solutions ◽  
Regional Stress ◽  
Regional Stress Field

Two key switches in regional stress field during multi-stage deformation in the Carboniferous−Triassic southernmost Altaids (Beishan, NW China): Response to orocline-related roll-back processes

2021 ◽  
Author(s):  
Zhonghua Tian ◽  
Wenjiao Xiao ◽  
Brian F. Windley ◽  
Peng Huang ◽  
Ji’en Zhang ◽  
...  
Keyword(s):  
Stress Field ◽  
Large Scale ◽  
Electron Backscatter Diffraction ◽  
Volcanic Rocks ◽  
Structural Deformation ◽  
Regional Stress ◽  
Regional Stress Field ◽  
Multi Stage ◽  
Beishan Orogenic Collage ◽  
Roll Back

The orogenic architecture of the Altaids of Central Asia was created by multiple large-scale slab roll-back and oroclinal bending. However, no regional structural deformation related to roll-back processes has been described. In this paper, we report a structural study of the Beishan orogenic collage in the southernmost Altaids, which is located in the southern wing of the Tuva-Mongol Orocline. Our new field mapping and structural analysis integrated with an electron backscatter diffraction study, paleontology, U-Pb dating, 39Ar-40Ar dating, together with published isotopic ages enables us to construct a detailed deformation-time sequence: During D1 times many thrusts were propagated northwards. In D2 there was ductile sinistral shearing at 336−326 Ma. In D3 times there was top-to-W/WNW ductile thrusting at 303−289 Ma. Two phases of folding were defined as D4 and D5. Three stages of extensional events (E1−E3) separately occurred during D1−D5. Two switches of the regional stress field were identified in the Carboniferous to Early Permian (D1-E1-D2-D3-E2) and Late Permian to Early Triassic (D4-E3-D5). These two switches in the stress field were associated with formation of bimodal volcanic rocks, and an extensional interarc basin with deposition of Permian-Triassic sediments, which can be related to two stages of roll-back of the subduction zone on the Paleo-Asian oceanic margin. We demonstrate for the first time that two key stress field switches were responses to the formation of the Tuva-Mongol Orocline.

scholarly journals Recent inversion of the Tyrrhenian Basin

Geology ◽  
2019 ◽  
Vol 48 (2) ◽  
pp. 123-127 ◽  
Author(s):  
Nevio Zitellini ◽  
César R. Ranero ◽  
M. Filomena Loreto ◽  
Marco Ligi ◽  
Marco Pastore ◽  
...  
Keyword(s):  
Stress Field ◽  
Driving Mechanism ◽  
Extensional Tectonics ◽  
Seismic Profiles ◽  
Regional Stress ◽  
Regional Stress Field ◽  
Slab Rollback ◽  
New Finding ◽  
Subduction System ◽  
Tyrrhenian Basin

Abstract The Tyrrhenian Basin is a region created by Neogene extensional tectonics related to slab rollback of the east-southeast–migrating Apennine subduction system, commonly believed to be actively underthrusting the Calabrian arc. A compilation of >12,000 km of multichannel seismic profiles, much of them recently collected or reprocessed, provided closer scrutiny and the mapping of previously undetected large compressive structures along the Tyrrhenian margin. This new finding suggests that Tyrrhenian Basin extension recently ceased. The ongoing compressional reorganization of the basin indicates a change of the regional stress field in the area, confirming that slab rollback is no longer a driving mechanism for regional kinematics, now dominated by the Africa-Eurasia lithospheric collision

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