Mineral composition in cognate inclusions in Late Miocene–Early Pliocene potassic lamprophyres with affinities to lamproites from the Denizli region, Western Anatolia, Turkey: Implications for uppermost mantle processes in a back-arc setting

Transport of Volatile-rich Melt from the Mantle Transition Zone via Compaction Pockets: Implications for Mantle Metasomatism and the Origin of Alkaline Lavas in the Turkish–Iranian Plateau

“…Several studies (e.g. Waters, 1987;Grégoire et al, 2003) (Semiz et al, 2012;Saadat et al, 2014;Prelević et al, 2014;Platevoet et al, 2014;Khezerlou et al, 2017, and Fig. 13a).…”

“…Considering mineral phase assemblages and textures, it has been suggested that these cumulate xenoliths have a magmatic origin and begin to crystallize from 2.2 to 0.5 GPa (e.g., Semiz et al, 2012;Khezerlou et al, 2017). Exotic parental melts (i.e., kamafugite, lamproite and lamprophyre) have been proposed as the parental magmas of some of these ultramafic cumulates (Prelević et al 2014;Platevoet et al, 2014;Semiz et al, 2012). Surprisingly the mineral compositions and bulk-rock isotopic ratios of the latter (i.e., 87 Sr/ 86 Sr: 0.7068-0.7095 and 143 Nd/ 144 Nd: 0.5124-0.5126, Fig.…”

“…In addition to this specific group of cumulates, other cumulate xenoliths from the TIP display a wide range of Sr and Nd isotopic ratios (Khezerlou et al, 2017;Prelević et al 2014;Semiz et al, 2012;Saadat et al, 2014). The observation of reverse zoning in clinopyroxenes and of cognate antecrystals and cumulative xenoliths hosted by TK lavas, has been interpreted as evidence of either mixing between melts of different compositions (mostly distinct UK and alkaline, probably sodic) or of the assimilation of solids by liquid phases (Semiz et al, 2012;Platevoet et al, 2014;Prelević et al 2014). It may explain why TK lavas plot in between UK and sodic-LK lavas in terms of alkalis (Na 2 O or K 2 O) versus isotopic ratios ( Fig.…”

40Ar/39Ar geochronology, geochemistry and petrology of volcanic rocks from the Simav Graben, western Turkey

“…Excepting for the Eskigediz and Kestel basalts, which have either ultrapotassic or shoshonitic character, all the other units show a strong ultrapotassic character according to criteria of Foley et al (1987). The Middle Miocene shoshonitic-ultrapotassic (SHO-UK) rocks with high-MgO contents geochemically resemble other orogenic ultrapotassic rocks along the Alpine-Himalayan system (from Spain, Italy, Serbo-Macedonia and the Afyon region in Turkey) (Akal 2008;Altherr et al 2004;Benito et al 1999;Duggen et al 2005;Prelević et al 2005Prelević et al , 2008Prelević et al , 2012Prelević et al , 2013Çoban and Flower 2006;Gao et al 2007;Yanev et al 2008;Conticelli et al 2009;Tommasini et al 2011;Semiz et al 2012;Prelević et al 2015) (Fig. 7).…”

“…Overall, the geochemical data from the magmatic rock groups suggest the following: (1) the HKCA and dominantly peraluminous rhyolitic (and dacitic) volcanics and granitic plutons were emplaced with similar geochemical features during the Lower Miocene; (2) two distinct magma lineages occurred during the late Lower-Middle Page 12 of 24 Miocene, producing (a) mainly HKCA volcanics and (b) high-MgO shoshonitic to ultrapotassic (SHO-UK) volcanics (including lamproites); (3) HKCA basaltic to dacitic volcanics likely evolved from a primitive magma composition that is best represented by the most basic sample of the Güzüngülü volcanics (i.e., sample D8257); and (4) the variable trace element contents of the SHO-UK samples for a given MgO content are comparable with other ultrapotassic volcanic rocks from the Alpine-Himalayan orogenic system, which are generally referred as orogenic ultrapotassic rocks (Benito et al 1999;Altherr et al 2004;Duggen et al 2005;Prelević et al 2005Prelević et al , 2008Prelević et al , 2012Prelević et al , 2013Ersoy and Helvacı 2007;Conticelli et al 2009;Tommasini et al 2011;Semiz et al 2012;Ozpinar et al 2013). …”