Architecture of the Southern Marginal Zone of the Upper Jurassic–Valanginian Carbonate Platform of the Northeastern Caucasus (Dagestan, Shakhdag Massif)

Gavrilov, Yu. О.

doi:10.1134/s0024490218060032

Cited by 4 publications

(11 citation statements)

References 18 publications

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“…The presence of decametre-scale allochthonous blocks and submarine landslide deposits throughout the Cretaceous stratigraphy indicates a highly unstable margin ( Figure 12). Interpretations of basin-scale submarine landslide deposits, which partially form the Qizilqaya and Shahdag mountains farther west, further validates this interpretation (Bochud, 2011;Gavrilov, 2018) (Figure 14), with the mega-clasts in the west of the study area possibly forming part of this deposit (Figures 13-15). Similar onlap relationships to those formed as the Cretaceous stratigraphy infilled the irregular surface created by earlier submarine landslide deposits, have been observed elsewhere at outcrop (e.g., Armitage, Romans, Covault, & Graham, 2009;Burbank, Vergés, Munoz, & Bentham, 1992;Kneller et al, 2020) and in the subsurface ( Figure 16) (e.g., Casson et al, 2020;Soutter, Kane, & Huuse, 2018).…”

Section: Nature Of the Late Cretaceous Bathymetrysupporting

confidence: 67%

“…Submarine landslide thicknesses also increase towards this high in the Barremian, suggesting the high influenced deposition from the Early Cretaceous until the Turonian. Previous work has shown the presence of a large c. Early Cretaceous submarine landslide, composed of remobilised Late Jurassic blocks, towards the west (Figure 15) (Bochud, 2011;Gavrilov, 2018). The exact timing of this failure is uncertain, with Gavrilov (2018) suggesting this event may have occurred in the Late Cretaceous.…”

Section: Buduq Synclinementioning

confidence: 94%

“…Previous work has shown the presence of a large c. Early Cretaceous submarine landslide, composed of remobilised Late Jurassic blocks, towards the west (Figure 15) (Bochud, 2011;Gavrilov, 2018). The exact timing of this failure is uncertain, with Gavrilov (2018) suggesting this event may have occurred in the Late Cretaceous. The stratigraphic observations made by this study indicate that this failure occurred prior to the Cenomanian, with this submarine landslide complex, or a related basin-scale mass failure, forming the westerly high and the complex stratigraphic relationships described previously .…”

Section: Buduq Synclinementioning

confidence: 94%

“…Changes in the geometry, exact extent and thus source area of the platform are probably linked to the compositional transition from a terrigenous to a carbonate-dominated platform (Nikishin et al, 1998(Nikishin et al, , 2001) rather than a geographical (Bochud, 2011), which moved up to 20 km without significantly effecting the internal stratigraphy (Gavrilov, 2018). (e) Block with both margins exposed and onlapped by mixed stratigraphy, black box locates C…”

Section: Stratigraphic Evolutionmentioning

confidence: 99%

“…Lobes can be important archives of palaeoclimatic and palaeogeographic information, and upstream changes in the source-to-sink system (e.g., Fildani et al, 2016;2018;Hessler & Fildani, 2019). They may also record the palaeoenvironmental conditions that lead to margin instability and collapse, and thus aid interpretation of submarine landslide genesis (Clift & Gaedicke, 2002;Fildani et al, 2016;2018). Exhumed deep-marine lobes have been studied in great detail, and a wide variety of stacking patterns, depositional processes and facies distributions has been described and interpreted (e.g., Bell, Stevenson, et al, 2018;Fildani et al, 2018;Fonnesu, Felletti, Haughton, Patacci, & McCaffrey, 2018;Kane et al, 2017;Mutti, 1983;Postma, Hilgen, & Zachariasse, 1993;Prélat et al, 2009;Soutter, Kane, Fuhrmann, Cumberpatch, & in non-mixed systems.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of a mixed siliciclastic‐carbonate deep‐marine system on an unstable margin: The Cretaceous of the Eastern Greater Caucasus, Azerbaijan

et al. 2020

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Mixed siliciclastic‐carbonate deep‐marine systems (mixed systems) are less documented in the geological record than pure siliciclastic systems. The similarities and differences between these systems are, therefore, poorly understood. A well‐exposed Late Cretaceous mixed system on the northern side of the Eastern Greater Caucasus, Azerbaijan, provides an opportunity to study the interaction between contemporaneous siliciclastic and carbonate deep‐marine deposition. Facies analysis reveals a Cenomanian–early Turonian siliciclastic submarine channel complex that abruptly transitions into a Mid Turonian–Maastrichtian mixed lobe‐dominated succession. The channels are entrenched in lows on the palaeo‐seafloor but are absent 10 km towards the west where an Early Cretaceous submarine landslide complex acted as a topographic barrier to deposition. By the Campanian, this topography was largely healed allowing extensive deposition of the mixed lobe‐dominated succession. Evidence for irregular bathymetry is recorded by opposing palaeoflow indicators and frequent submarine landslides. The overall sequence is interpreted to represent the abrupt transition from Cenomanian–early Turonian siliciclastic progradation to c. Mid Turonian retrogradation, followed by a gradual return to progradation in the Santonian–Maastrichtian. The siliciclastic systems periodically punctuate a more widely extensive calcareous system from the Mid Turonian onwards, resulting in a mixed deep‐marine system. Mixed lobes differ from their siliciclastic counterparts in that they contain both siliciclastic and calcareous depositional elements making determining distal and proximal environments challenging using conventional terminology and complicate palaeogeographic interpretations. Modulation and remobilisation also occur between the two contemporaneous systems making stacking patterns difficult to decipher. The results provide insight into the behaviour of multiple contemporaneous deep‐marine fans, an aspect that is challenging to decipher in non‐mixed systems. The study area is comparable in terms of facies, architectures and the presence of widespread instability to offshore The Gambia, NW Africa, and could form a suitable analogue for mixed deep‐marine systems observed elsewhere.

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Section: Nature Of the Late Cretaceous Bathymetrysupporting

confidence: 67%

Section: Buduq Synclinementioning

confidence: 94%

Section: Buduq Synclinementioning

confidence: 94%

Section: Stratigraphic Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution of a mixed siliciclastic‐carbonate deep‐marine system on an unstable margin: The Cretaceous of the Eastern Greater Caucasus, Azerbaijan

et al. 2020

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Diverse Deformation Mechanisms and Lithologic Controls in an Active Orogenic Wedge: Structural Geology and Thermochronometry of the Eastern Greater Caucasus

Cowgill

et al. 2022

Tectonics

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Orogenic wedges are common at convergent plate margins and deform internally to maintain a self‐similar geometry during growth. New structural mapping and thermochronometry data illustrate that the eastern Greater Caucasus mountain range of western Asia undergoes deformation via distinct mechanisms that correspond with contrasting lithologies of two sedimentary rock packages within the orogen. The orogen interior comprises a package of Mesozoic thin‐bedded (<10 cm) sandstones and shales. These strata are deformed throughout by short‐wavelength (<1 km) folds that are not fault‐bend or fault‐propagation folds. In contrast, a coeval package of thick‐bedded (up to 5 m) volcaniclastic sandstone and carbonate, known as the Vandam Zone, has been accreted and is deformed via imbrication of coherent thrust sheets forming fault‐related folds of 5–10 km wavelength. Structural reconstructions and thermochronometric data indicate that the Vandam Zone package was accreted between ca. 13 and 3 Ma. Following Vandam Zone accretion, thermal modeling of thermochronometric data indicates rapid exhumation (∼0.3–1 mm/yr) in the wedge interior beginning between ca. 6 and 3 Ma, and a novel thermochronometric paleo‐rotation analysis suggests out‐of‐sequence folding of wedge‐interior strata after ca. 3 Ma. Field relationships suggest that the Vandam Zone underwent syn‐convergent extension following accretion. Together, the data record spatially and temporally variable deformation, dependent on both the mechanical properties of deforming lithologies and perturbations such as accretion of material from the down‐going to the overriding plate. The diverse modes of deformation are consistent with the maintenance of critical taper.

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Exploration Plays in the Caucasus Region

Tari

Blackbourn

Boote³

et al. 2021

Journal of Petroleum Geology

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Exploration efforts around the Greater Caucasus region started towards the end of the 19th century and established a wide range of petroleum play types in various basin segments around the orogen. All these plays are associated with the flanks of the inverted thrust-fold belt and the adjacent foreland basin systems, but display significant variation among the basin segments depending on the tectonostratigraphic units involved and the degree of exploration maturity. Whereas the same main source rocks have generated most of the hydrocarbons in all the basins (namely organic-rich shales in the Oligocene -Lower Miocene Maykop Group and the Eocene Kuma Formation), it is primarily the trapping style, both proven and speculative, which is responsible for the broad spectrum of play types observed. Eleven play type diagrams across six main petroleum provinces of the Greater Caucasus region are presented in this paper and summarize the current exploration understanding of the existing discoveries and potential new play targets. These play cartoons offer a prospect-scale summary of both mature producing and underexplored basin segments in a coherent visual manner, and are therefore intended to promote future exploration efforts in the Caucasus region. The testing of new play types requires the proper risking of the two most critical elements in the region: hydrocarbon kitchen effectiveness, and post-charge trap modification. The de-risking of these factors will require properly designed, fit-for-purpose acquisition of modern geological and geophysical data sets.

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Architecture of the Southern Marginal Zone of the Upper Jurassic–Valanginian Carbonate Platform of the Northeastern Caucasus (Dagestan, Shakhdag Massif)

Cited by 4 publications

References 18 publications

Evolution of a mixed siliciclastic‐carbonate deep‐marine system on an unstable margin: The Cretaceous of the Eastern Greater Caucasus, Azerbaijan

Evolution of a mixed siliciclastic‐carbonate deep‐marine system on an unstable margin: The Cretaceous of the Eastern Greater Caucasus, Azerbaijan

Diverse Deformation Mechanisms and Lithologic Controls in an Active Orogenic Wedge: Structural Geology and Thermochronometry of the Eastern Greater Caucasus

Exploration Plays in the Caucasus Region

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