The genesis of the stable isotope (O, H) record in arc magmas: the Kamtchatka's case

Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere

“…The oxygen isotopic compositions of the VVP bulk rock xenoliths range from 6.6 to 11.2‰ (Table 4). This δ 18 O range of variation is significantly higher than the normal mantle average (5.6 ± 0.2‰; Javoy, 1980), even in convergent margins (6.0 ± 0.4‰; Taylor, 1968Muehlenbachs and Clayton, 1972;Magaritz et al, 1978;Déruelle et al, 1983;Ito and Stern, 1985;Pineau et al, 1999), and exceeds that of the host basanites (7.0-9.7‰). High δ…”

A petrological and geochemical study on time-series samples from Klyuchevskoy volcano, Kamchatka arc

“…Kayzar et al (2014) reported that middle and lower crustal xenoliths from Bezymianny volcano, which is located 9 km from O values. However, the source of these high δ 18 O values has been a matter of debate; various possible source, such as fluids from subducted sediments, fluids from the subducted Hawaii-Emperor Seamounts, a pyroxenite mantle source, metasomatized lithospheric and/or asthenospheric mantle, and hydrothermally altered crust, have been examined (e.g., Pineau et al 1999;Pokrovsky and Volynets 1999;Dorendorf et al 2000;Bindeman et al 2004;Auer et al 2009). The observed temporal variation of the δ 18 O values (Fig.…”

Deciphering petrogenic processes using Pb isotope ratios from time-series samples at Bezymianny and Klyuchevskoy volcanoes, Central Kamchatka Depression

“…Lead isotope compositions of sediments from the ODP Leg 145 Site 881, 883, and 884 drill cores from the Pacific Ocean off the coast of Kamchatka limit subducted sediment input into the arc to less than 1 % (Kersting and Arculus 1995). In addition, the primitive nature of melts (Mg# 71 at Klyuchevskoy: KLU-16 from Dorendorf et al 2000) suggests limited crustal assimilation (Pineau et al 1999;Dorendorf et al 2000;Ishikawa et al 2001). Oxygen isotope data, however, suggest that large amounts of assimilation may occur beneath the CKD, but the required assimilant is altered lithospheric mantle that would not modify Mg values (Auer et al 2009).…”

“…However, Bezymianny volcano, which erupts the most silicic melts in the Klyuchevskoy Group, has not been as well characterized geochemically. Ozerov et al (1997) suggested that Klyuchevskoy and Bezymianny are genetically related, which is supported by overlapping stable (O) and radiogenic (Pb, Nd) isotope data for the two systems (Kersting and Arculus 1995;Pineau et al 1999;Dorendorf et al 2000;Churikova et al 2001;Bindeman et al 2004;Münker et al 2004), but recent studies show evidence for magma mixing (Almeev et al 2013a;Shcherbakov et al 2011;Turner et al 2013) and an independent link to a mantle velocity anomaly at Bezymianny (Koulakov et al 2013).…”

“…These systems erupt frequently, permitting the investigation of compositional variation on both short temporal and spatial scales. The petrology and chemistry of Klyuchevskoy volcano have been well studied Kersting and Arculus 1994;Khubanaya et al 1994;Ariskin et al 1995;Ozerov et al 1997;Khubanaya and Sobolev 1998;Pineau et al 1999;Dorendorf et al 2000;Ozerov 2000;Volynets et al 2000;Dosseto et al 2003;Mironov et al 2001;Portnyagin et al 2007a, b;Turner et al 2007;Auer et al 2009;Mironov and Portnyagin 2011). However, Bezymianny volcano, which erupts the most silicic melts in the Klyuchevskoy Group, has not been as well characterized geochemically.…”