Petrology and Geochemistry of the Quaternary Mafic Volcanism to the NE of Lake Van, Eastern Anatolian Collision Zone, Turkey

Long Wavelength Progressive Plateau Uplift in Eastern Anatolia Since 20 Ma: Implications for the Role of Slab Peel‐Back and Break‐Off

“…The surface geology across the East Anatolian Plateau is dominated by widespread Neogene-Quaternary magmatism approximately (40,000 km 2 ), varying in composition from basaltic to granitic (Innocenti et al, 1976(Innocenti et al, , 1980(Innocenti et al, , 1982Pearce et al, 1990;Yılmaz, 1990;Ercan et al, 1990;Notsu et al, 1995;Bigazzi et al, 1997;Keskin et al, 1998;Keskin, 2003Keskin, , 2007Şen et al, 2004;Özdemir et al, 2006;Hubert-Ferrari et al, 2009;Kheirkhah et al, 2009;Çolakoğlu & Arehart, 2010;Lebedev et al, 2010;Lebedev, Volkov, et al, 2013;Lebedev, Chugaev, et al, 2016, Lebedev et al, 2018Özdemir, 2011;Sumita & Schmincke, 2013;Özdemir & Güleç, 2014;Selçuk et al, 2016;Oyan et al, 2016Oyan et al, , 2017Oyan, 2018;Di Giuseppe et al, 2017;Açlan & Altun, 2018;Rabayrol et al, 2019) (Figures 1a and 2a). These petrological studies infer the lava chemistry, the origin, and the depth of melting in Eastern Anatolia.…”

Geochemical and Petrologic Evolution of Otlakbaşi Basaltic Volcanism to the East of Lake Van

“…with fl uids or metasomatisation processes, while Th/ Yb ratios slightly increased compared to Ba/Yb ratios indicates enrichment processes with sediment melts. Situations when both values are low refl ect melting or altered oceanic crust or metasomatisation processes with fl uids released from this (Oyan et al, 2017). As seen in fi gure 10, the Otlakbaşı basaltic lava samples trend towards increasing Th/Yb ratios and refl ect enrichment with dominantly sediment melts and metasomatisation processes.…”

“…As a result, ratios of elements enriched in fl uid phase or sediment (or altered oceanic crust) melts may be used to determine enrichment processes in the source area. With this aim, Ba/Yb and Th/Yb binary variation diagrams recommended by Oyan et al (2017) were produced ( Figure 10). While Th is mobile in sediment or altered oceanic crust melts, Ba is mobile and enriched in the fl uids released from these.…”

“…As a result of this collision east-west oriented folds, reverse faults, and the strike-slip North Anatolian and East Anatolian fault systems (Figure 1a) developed in the region (Yılmaz et al, 1987). The EACZ is characterised by volcanic activity ranging from the Miocene to historical periods (Keskin et al, 2013;Oyan et al, 2016Oyan et al, , 2017. This volcanic activity began in the south of the EACZ before 15 My (Lebedev et al, 2010).…”

Geochemical Characteristics of Anatolian Basalts: Comment on “Neogene Uplift and Magmatism of Anatolia: Insights From Drainage Analysis and Basaltic Geochemistry” by McNab Et Al.

“…Heterogeneous mantle source with various degrees of melting is thought to be responsible for the widespread volcanism around the Karacadağ, and especially they are isotopically (e.g., enriched 87 Sr/ 86 Sr composition) contemporaneous with the other SEAVP volcanics (Ekici et al, 2012;Lustrino et al, 2010). Therefore, we divided this region as a separate group from the EAVP where there is a N-S trending postcollisional volcanism (along the BSZ; Figure 1) initiated at middle Miocene (~13 Ma) and continued to the historical times (e.g., Alıcı-Şen et al, 2004;Innocenti et al, 1976;Keskin, 2003Keskin, , 2007Keskin et al, 1998;Notsu et al, 1995;Oyan et al, 2016Oyan et al, , 2017Özdemir & Güleç, 2014;Pearce et al, 1990). There is a clear younging trend in the EAVP volcanism from the north (e.g., Kars-Erzurum plateau,~11 Ma; Keskin et al, 1998) to the south (Etrüsk volcano, 4.7-3.6 Ma; Oyan et al, 2016;Süphan volcano, 0.76-0.06 Ma;Özdemir & Güleç, 2014).…”