Quaternary tectonics of recent basins in northwestern Armenia

Трифонов, В. Г.; Шалаева, Е. А.; Saakyan, L. Kh.; Bachmanov, D.M.; Lebedev, V. A.; Trikhunkov, Ya. I.; Симакова, А.Н.; Avagyan, Ara; Tesakov, Alexey S.; Frolov, P. D.; Lyubin, V.P.; Belyaeva, E. V.; Латышев, А. В.; Ozherelyev, D.V.; Колесниченко, А. В.

doi:10.1134/s0016852117030116

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…The Arapi unit is incised into the Ani unit terrace, and the Arapi unit surface is situated ca. 50 m lower than the Ani unit terrace (Trifonov et al, 2017). In the central Shirak Basin, the Karakhach unit thins out, and the Ani unit covers the basaltic trachyandesites with the K/Ar and FIGURE 1.…”

Section: Geological Settingmentioning

confidence: 87%

“…The latter extends to the adjacent part of North-Eastern Turkey. These deposits are differentiated into the Karakhach, Ani, and Arapi sedimentary units (formations) in the Shirak Basin (Sayadyan, 2009;Trifonov et al, 2017). In the northern margin of the Shirak Basin, the Lower Pleistocene Karakhach unit occupies the highest topographic position.…”

Section: Geological Settingmentioning

confidence: 99%

“…In the northern margin of the Shirak Basin, the Lower Pleistocene Karakhach unit occupies the highest topographic position. The 6 m thick analog of Ani and Arapi units (Kurtan unit) is incised into the upper terrace composed by the Karakhach unit near the Kaps village (Trifonov et al, 2017). The surface of the Kurtan unit terrace is 60-70 m lower than the Karakhach unit terrace.…”

Section: Geological Settingmentioning

confidence: 99%

“…The surface of the Kurtan unit terrace is 60-70 m lower than the Karakhach unit terrace. Just to the south, the Ani unit thickness abruptly increases on the W-E-trending Kaps flexure-fault zone (Trifonov et al, 2017) and reaches 137 m in the northern Shirak Basin, in the borehole 6 near the Marmashen village (Sayadyan, 2009). The Arapi unit is incised into the Ani unit terrace, and the Arapi unit surface is situated ca.…”

Section: Geological Settingmentioning

confidence: 99%

“…She also rejected an assignment of these horses by Alexeeva (1977) to caballoid froms (Forsten, 1999). The additional age control was provided by the geochronology of the Leninakan tuffs covering or interfingering with Arapi deposits yielding dates in the range of 0.65-0.7 Ma (Melik-Adamyan, 2016;Shalaeva et al, 2019) and normal polarity (Brunhes Chron) of these deposits (Sayadyan, 2009;Trifonov et al, 2017;Shalaeva et al, 2019). Recently small mammals of the Gyumri appearance were found in the Krasar (bed 2) section in Upper Akhuryan basin of western Armenia (Trifonov et al, 2016;Tesakov, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Early-Middle Pleistocene environmental and biotic transition in NW Armenia, southern Caucasus

Tesakov

Симакова

Frolov

et al. 2019

Palaeontol Electron

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Quaternary biota of north-western Armenia is studied from several localities in the Ani and Arapi fluvial formations of the Shirak and Upper Akhuryan sedimentary basins. Palynology of lacustrine deposits of the Ani Formation indicates cyclic alternation of forest-steppe and steppe coenoses in the Shirak Depression. The patchy pollen record from the sections of the Arapi Formation indicates forest-steppe coenoses. Aquatic molluscs from the Ani Formation are dominated by gastropods and dreissenid bivalves. Molluscs of the Arapi Formation are characterised by limnophilic freshwater species with mostly extant forms. The Arapi deposits yielded remains of fishes, amphibians, and small mammals. The freshwater fish assemblage comprises cyprinid species that derived from the earlier Plio-Pleistocene fish communities of Armenia. The assemblage indicates lacustrine and river habitats with rocky bottoms and the presence of water plants overgrowth. The herpetofauna from the Arapi Formation includes remains of anuran amphibians that indicate aquatic habitats. Small mammals include Sorex cf. runtonensis, Neomys cf. hintoni, Ochotona sp., Mimomys intermedius, Terricola sp., Microtus gr. nutiensis, Prolagurus pannonicus transylvanicus,and Ellobius pomeli. This fauna characterises the Leninakan (Gyumri) faunal assemblage correlated to the late Biharian of the European land mammal biochronology, Tiraspol faunal complex of Eastern Europe, and the Cromerian of NW Europe. The studied record has an important biogeographic significance for the southern rim of the Ponto-Caspian region. It shows the complex history of the biotic exchanges and polygenous origin of the terrestrial communities in the southern Caucasus. Radiometric, paleomagnetic, and biotic control make it possible to date the Ani deposits to late Early and earliest Middle Pleistocene. The age of the Arapi formation is early Middle Pleistocene older than 0.6 Ma. The main trend of landscape evolution in the region between ca. 1.5-0.7 Ma is a transition from forest-steppe to steppe conditions.

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Section: Geological Settingmentioning

confidence: 87%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%