Banca de DEFESA: MARILIA BARBOSA VENÂNCIO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MARILIA BARBOSA VENÂNCIO
DATE: 21/12/2024
TIME: 14:00
LOCAL: Videoconferência / CCET
TITLE:

Physical Modeling of the Influence of Structural Inheritance on the Formation of New Structures: Application to the Pernambuco Shear Zone, NE Brazil

KEY WORDS:

Structural Inheritance; Physical Structural Modeling; Pernambuco Shear Zone.

PAGES: 160
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geofísica
SUMMARY:

Abstract: Shear zones (SZ) in crystalline basement introduce crustal and lithospheric heterogeneities, acting as zones of weakness that influence the geometry and location of younger structures. This study investigated the influence of preexisting structures on the formation of sedimentary basins and the development of newly formed or reactivated structures during subsequent tectonic events, using the Pernambuco Shear Zone (PSZ) as a natural example. Experimental models, analyzed using Particle Image Velocimetry (PIV), simulated the influence of structural inheritance on the development of a rift basin orthogonal to the preexisting SZ under varying rheological conditions. The effects of the orientation of preexisting structures on subsequent brittle deformation were also examined. The integration of experimental results and field data contributed to a better understanding of brittle deformation within the PSZ. The results showed that preexisting SZs controlled the orientation, location, and geometry of newly formed structures, even without reactivation. Basins associated with these inherited influences are wider and shallower. Rheological variations also influenced the number of structures formed. In strike-slip zones, the orientation of inherited structures controlled the formation of subsidiary fractures in the Riedel system, determining the type of structure generated, whether newly formed or reactivated, and the distribution of on- and off-fault deformation. In the PSZ, the inherited mylonitic fabric acted as a mechanical weakness zone, facilitating brittle reactivation in three structural sets related to: (i) dextral strike-slip reactivation at the end of the Brasiliano Cycle; (ii) sinistral reactivation in the Early Cretaceous, associated with the rifting of the South Atlantic Ocean; and (iii) the formation of N-S normal faults and fractures linked to the same rifting process as (ii) but occurring later The results underscore the potential of analog modeling to predict fault patterns in complex tectonic systems.

COMMITTEE MEMBERS:
Externo à Instituição - BARBARA TRZASKOS - UFPR
Presidente - 1217847 - FERNANDO CESAR ALVES DA SILVA
Externo à Instituição - NOBERTO MORALES - UNESP
Externo à Instituição - Tiago Siqueira de Miranda - UFPE
Interno - ***.785.944-** - VINCENZO LA BRUNA - NÃO INFORMADO