Journal
FRONTIERS IN EARTH SCIENCE
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/feart.2022.968386
Keywords
Greater Caucasus orogen; rioni foreland fold-and-thrust belt; seismic reflection profile; balanced and reconstructed cross-sections; fault-propagation fold; duplex; thrust sequence; thrust-top basin
Categories
Funding
- Shota Rustaveli National Science Foundation of Georgia
- [FNF-18-19173]
Ask authors/readers for more resources
This study presents the deformation structural style of the Rioni foreland fold-and-thrust belt, one of the important examples of far-field deformation in the Arabia-Eurasia convergence zone. The main deformation style in this area includes fault-propagation folds, duplexes, and triangle zone. The study also reveals the existence of thrust-top basins controlled by thrust sequences. These findings contribute to a better understanding of collision-driven deformation in the region.
The Rioni foreland fold-and-thrust belt is part of the Greater Caucasus pro-wedge and is one of the most important examples of the collision-driven far-field deformation of the Arabia-Eurasia convergence zone. Here we show the deformation structural style of the Rioni foreland fold-and-thrust belt based on seismic reflection profiles and regional balanced cross-section. The main style of deformation within the Rioni foreland fold-and-thrust belt is represented by a set of fault-propagation folds, duplexes, and triangle zone. The regional balanced cross-section shows that fault-propagation folds above the upper detachment level can develop by piggyback and break-back thrust sequences. Formation of fault-bend fold duplex structures above the lower detachment is related to piggyback thrust sequences. A balanced section restoration of compressional structures across the Rioni foreland fold-and-thrust belt provides a minimum estimate of shortening of -40%, equivalent -42.78 km. The synclines within the Rioni foreland fold-and-thrust belt are filled by the Middle Miocene-Pleistocene shallow marine and continental syn-tectonic sediments, forming a series of typical thrust-top basins. Fault-propagation folds and duplex structures formed the main structure of the thrust-top basin. The evolution of the thrust-top basins was mainly controlled by the kinematics of thrust sequences. Using end-member modes of thrust sequences, the thrust-top basins are divided into: 1) Type I-piggyback basin, 2) Type II-break-back basin, and 3) Type III-formation of thrust-top basin characterized by bi-vergent geometry and related to combined, piggyback and piggyback back thrust sequences.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available