The Geometry of the Two Orogens Convergence and Collision Zones in Central Georgia: New Data from Seismic Reflection Profiles

Alania, Victor; Beridze, Tamar; Enukidze, Onise; Chagelishvili, Rusudan; Lebanidze, Zurab; Maqadze, Davit; Razmadze, A.; Sadradze, Nino; Tevzadze, Niko

doi:10.1007/978-94-024-2046-3_6

Cited by 11 publications

(16 citation statements)

References 29 publications

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“…More precise timing of the initiation of, and the detailed patterns of propagation and rates of shortening within these fold-thrust belts could further clarify this hypothesis. Alternatively, or perhaps in concert, this reorganization could reflect a response of the GC to collision with the northern margin of the LC thickened crust and structural systems (e.g., Alania, Beridze, et al, 2021;Banks et al, 1997;Forte et al, 2014;Nemčok et al, 2013).…”

Section: Implication For the Tectonics Of The Greater Caucasusmentioning

confidence: 99%

“…The majority of modern LC motion appears to be accommodated via shortening along the southern flank of the GC, but with noticeable departures near the center of the range, where significant fractions of shortening are accommodated in the interior or along the northern edge (Figure 1; Forte et al., 2014). This shift in locus of shortening within the range may relate to the ongoing collision of the LC and GC structural systems in the center of the range (e.g., Alania, Beridze, et al., 2021; Banks et al., 1997; Forte et al., 2014; Nemčok et al., 2013; Sokhadze et al., 2018). It is unclear how far back in time these convergence gradients, either the broad counter‐clockwise LC motion or the partitioning between shortening on the southern versus northern flank of the GC, can be extrapolated.…”

Section: Introductionmentioning

confidence: 99%

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Building a Young Mountain Range: Insight Into the Growth of the Greater Caucasus Mountains From Detrital Zircon (U‐Th)/He Thermochronology and ¹⁰Be Erosion Rates

et al. 2022

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The Greater Caucasus (GC) Mountains within the central Arabia‐Eurasia collision zone are an archetypal example of a young collisional orogen. However, the mechanisms driving rock uplift and forming the topography of the range are controversial, with recent provocative suggestions that uplift of the western GC is strongly influenced by an isostatic response to slab detachment, whereas the eastern half has grown through shortening and crustal thickening. Testing this hypothesis is challenging because records of exhumation rates mostly come from the western GC, where slab detachment may have occurred. To address this data gap, we report 623 new, paired zircon U‐Pb and (U‐Th)/He ages from seven different modern river sediments, spanning a ∼400 km long gap in bedrock thermochronometer data. We synthesize these with prior bedrock thermochronometer data, recent catchment averaged 10Be cosmogenic exhumation rates, topographic analyses, structural observations, and plate reconstructions to evaluate the mechanisms growing the GC topography. We find no evidence of major differences in rates, timing of onset of cooling, or total amounts of exhumation across the possible slab edge, inconsistent with previous suggestions of heterogeneous drivers for exhumation along‐strike. Comparison of exhumation across timescales highlight a potential acceleration, but one that appears to suggest a consistent northward shift of the locus of more rapid exhumation. Integration of these new datasets with simple models of orogenic growth suggest that the gross topography of the GC is explainable with traditional models of accretion, thickening, and uplift and does not require any additional slab‐related mechanisms.

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Section: Implication For the Tectonics Of The Greater Caucasusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Building a Young Mountain Range: Insight Into the Growth of the Greater Caucasus Mountains From Detrital Zircon (U‐Th)/He Thermochronology and ¹⁰Be Erosion Rates

et al. 2022

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“…The majority of modern LC motion appears to be accommodated via shortening along the southern flank of the GC, but with noticeable departures near the center of the range, where significant fractions of shortening are accommodated in the interior or along the northern edge (Figure 1; Forte et al, 2014). This shift in locus of shortening within the range may relate to the ongoing collision of the LC and GC structural systems in the center of the range (e.g., Alania, Beridze, et al, 2021;Banks et al, 1997;Forte et al, 2014;Nemčok et al, 2013;Sokhadze et al, 2018). It is unclear how far back in time these convergence gradients, either the broad counter-clockwise LC motion or the partitioning between shortening on the southern versus northern flank of the GC, can be extrapolated.…”

Section: Convergence and Shortening In The Greater Caucasusmentioning

confidence: 99%

Building a Young Mountain Range: Insight into the Growth of the Greater Caucasus Mountains from Detrital Zircon (U-Th)/He Thermochronology and 10Be Erosion Rates

Forte

Gutterman

Soest

et al. 2022

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Deformation of the Rioni double flexural foreland basin (Banks et al, 1997) was controlled by the action of two opposing orogenic fronts, the LC retro-wedge to the south and the GC pro-wedge to the north (Alania et al, 2021a). The tectonic evolution of LC and GC is the result of the Arabia-Eurasia collision during Alpine times, which led to the inversion of back-arc basins and the formation of two orogens with the Rioni and Kura foreland basins in between (Figure 1B) (e.g., Adamia et al, 1981;Sobornov, 1996;Banks et al, 1997;Mosar et al, 2010;Nemcok et al, 2013;Cowgill et al, 2016;Sosson et al, 2016;Tari et al, 2018;Alania et al, 2021a;Alania et al, 2021b;Alania et al, 2021c;Corrado et al, 2021;Gusmeo et al, 2021;Gusmeo et al, 2022;Tari et al, 2021;Cowgill et al, 2022;Mosar et al, 2022). The Rioni and Kura foreland basins in turn are divided from each other by the Imereti Uplift Zone (IUZ) (Figure 1B).…”

Section: Geological Settingmentioning

confidence: 99%

Deformation structural style of the rioni foreland fold-and-thrust belt, western greater caucasus: Insight from the balanced cross-section

et al. 2022

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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.

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The Geometry of the Two Orogens Convergence and Collision Zones in Central Georgia: New Data from Seismic Reflection Profiles

Cited by 11 publications

References 29 publications

Building a Young Mountain Range: Insight Into the Growth of the Greater Caucasus Mountains From Detrital Zircon (U‐Th)/He Thermochronology and ¹⁰Be Erosion Rates

Building a Young Mountain Range: Insight Into the Growth of the Greater Caucasus Mountains From Detrital Zircon (U‐Th)/He Thermochronology and ¹⁰Be Erosion Rates

Building a Young Mountain Range: Insight into the Growth of the Greater Caucasus Mountains from Detrital Zircon (U-Th)/He Thermochronology and 10Be Erosion Rates

Deformation structural style of the rioni foreland fold-and-thrust belt, western greater caucasus: Insight from the balanced cross-section

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The Geometry of the Two Orogens Convergence and Collision Zones in Central Georgia: New Data from Seismic Reflection Profiles

Cited by 11 publications

References 29 publications

Building a Young Mountain Range: Insight Into the Growth of the Greater Caucasus Mountains From Detrital Zircon (U‐Th)/He Thermochronology and 10Be Erosion Rates

Building a Young Mountain Range: Insight Into the Growth of the Greater Caucasus Mountains From Detrital Zircon (U‐Th)/He Thermochronology and 10Be Erosion Rates

Building a Young Mountain Range: Insight into the Growth of the Greater Caucasus Mountains from Detrital Zircon (U-Th)/He Thermochronology and 10Be Erosion Rates

Deformation structural style of the rioni foreland fold-and-thrust belt, western greater caucasus: Insight from the balanced cross-section

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Building a Young Mountain Range: Insight Into the Growth of the Greater Caucasus Mountains From Detrital Zircon (U‐Th)/He Thermochronology and ¹⁰Be Erosion Rates

Building a Young Mountain Range: Insight Into the Growth of the Greater Caucasus Mountains From Detrital Zircon (U‐Th)/He Thermochronology and ¹⁰Be Erosion Rates