Geochronology and genesis of subalkaline basaltic lava rivers at the Dzhavakheti highland, lesser Caucasus: K-Ar and Sr-Nd isotopic data

Quaternary post-collision alkaline volcanism NW of Ahar (NW Iran): geochemical constraints of fractional crystallization process

“…The isotopic data of the Ahar Quaternary volcanic rocks are similar to the isotopic data reported from the Damavand Quaternary stratovolcano (Liotard et al 2008;Mirnejad et al 2010) in the central part of the Alborz magmatic belt (AMB), Quaternary volcanism from the Iran/Turkey borderlands (Kheirkhah et al 2009) and Quaternary volcanic centers in Eastern Anatolia (Buket & Temel 1998). The isotopic ratio of the Lesser Caucasus alkaline Quaternary volcanic rocks (Lebedev et al 2003(Lebedev et al , 2007, Ararat Quaternary volcano (Gülen 1984) and Neogene volcanic rocks of eastern Turkey (Aydin et al 2008) are different from the study rocks (Fig. 8) …”

“…Locations of depleted mantle (DM) and enriched mantles (EMI, EMII) are from Zindler & Hart (1986). The samples from other Neogene alkaline volcanic suites are also plotted for comparison, including the QVA (alkaline Quaternary volcanic rocks, Ararat volcano; Gülen 1984), QVC (alkaline Quaternary volcanic rocks, Lesser Caucasus; Lebedev et al 2003Lebedev et al , 2007 with trends from low abundances in alkali basalts towards higher abundances in trachyandesites (Fig. 9).…”

Petrology and geochemistry of the Karaj Dam basement sill: Implications for geodynamic evolution of the Alborz magmatic belt

“…(b) Chondrite-normalized REE patterns (values from Nakamura, 1974). (Lebedev et al, 2003(Lebedev et al, , 2007, with which this pluton may share a common mantle source. (Table 4).…”

“…Pb isotopes of the samples are clustered within a field that is close to the EM2 end-member (Fig. 11a) (Karsli et al, 2012), and young volcanics from Lesser Caucasus (Lebedev et al, 2003(Lebedev et al, , 2007 are also plotted for comparison.…”

Intracanyon basalt lavas of the Debed River (northern Armenia), part of a Pliocene–Pleistocene continental flood basalt province in the South Caucasus

“…1,2). Late Pliocene to Early Pleistocene (~3.25-2.05 Ma) basalt lavas (Lebedev et al, 2007), forming sequences 200-400 m thick, are exposed in the canyons of the Debed and Dzoraget Rivers in the Lori Plateau (northern Armenia), in the canyon of the Akhuryan River (Armenia-Turkey), in the adjoining Kars-Erzurum Plateau (northeastern Turkey), and in the Javakheti Plateau (Georgia-Armenia). The same basalts are also found in the Gegham Uplands in central Armenia as well in the Hrazdan River canyon up to the city of Yerevan (Figs.…”