2024-03-28T21:22:35Zhttp://doidb.wdc-terra.org/oaip/oaioai:doidb.wdc-terra.org:63632020-09-26T13:24:08ZDOIDBDOIDB.FID
10.5880/fidgeo.2018.001
Corti, Giacomo
Giacomo
Corti
Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, Florence, Italy
Sordi, Riccardo
Riccardo
Sordi
Università degli Studi di Firenze, Dipartimento di Scienze della Terra, Florence, Italy
Cucci, Federica
Federica
Cucci
Università degli Studi di Firenze, Dipartimento di Scienze della Terra, Florence, Italy
Centrifuge models investigating the influence of transverse pre-existing weaknesses on continental rifting
GFZ Data Services
2018
analogue modelling
continental rifting
pre-existing structures
normal faulting
analogue models of geologic processes
multi-scale laboratories
EPOS
analogue modelling results
Tectonics Modelling Laboratory (IGG-CNR, Italy)
IGG-CNR, Florence, Italy
eng
Dataset
10.1130/GES00863.1
10.1016/j.tecto.2011.06.010
10.3390/ma10060635
10.1016/j.tecto.2018.02.011
1511988 Bytes
1 Files
application/x-zip-compressed
CC BY 4.0
We present the results of centrifuge experiments investigating the role of preexisting crustal discontinuity on continental rifting. Specifically, we reproduce inherited weaknesses, orthogonal to the rift trend and parallel to the extension direction, and analyze their influence on the evolution and architecture of extensional deformation in the inner part and at the margins of continental rift valleys. Four different models, with variable width of the pre-existing weakness are illustrated.
The models show a significant influence exerted by the pre-existing anisotropy on rifting: specifically, the inherited weakness inhibits the development of large boundary faults at rift margins, which are instead replaced by gentle monoclines dipping toward the rift axis. Axial faults are “captured” by the inherited anisotropy and rotate towards the pre-existing weakness, which therefore produces an unusual structural pattern also in the axial zone. This influence is dependent on the initial width of the pre-rift anisotropy and becomes negligible when its scaled width is 20 km or less.