Lamproites from Gaussberg, Antarctica: Possible Transition Zone Melts of Archaean Subducted Sediments

Importance of water for Archaean granitoid petrology: a comparative study of TTG and potassic granitoids from Barberton Mountain Land, South Africa

“…XRF analyses (major elements) were performed at the University of Fribourg, Switzerland, and followed standard procedures. Trace elements were analysed using a VG Plasma Quad 2+ at the University of Queensland, Australia, following the procedures described in Murphy et al (2002).…”

Chemical and Pb isotope composition of olivine-hosted melt inclusions from the Hannuoba basalts, North China Craton: Implications for petrogenesis and mantle source

“…5, Pb isotopic compositions of olivine-hosted melt inclusions in tholeiites vary significantly and extend toward EM1-type isotopic composition, indicating that a component with high Recycled ancient oceanic crust and sediment isolated for N1 Ga are likely to be the source materials for the EM1-type Pb isotopic component. Oceanic and continental basalts with EM1-like characteristics have been often ascribed to the presence of recycled ancient oceanic crust and sediment in their mantle source (Hofmann, 1997;Rehkamper and Hofmann, 1997;Eisele et al, 2002;Murphy et al, 2002;Ren et al, 2006Ren et al, , 2009Rapp et al, 2008). As illustrated in Fig.…”

“…This suggests that the isotopic composition of mantle source rocks was strongly influenced by the addition of a small amount of a distinct source component while major element compositions were largely unaffected. Previous isotopic modeling showed that even a small amount of sediment incorporated into the mantle source would have a significant impact on isotopic composition (Hofmann, 1997;Rehkamper and Hofmann, 1997;Eisele et al, 2002;Murphy et al, 2002). Therefore, recycled ancient oceanic crust and sediment would be suitable candidates for the EM1-like signature of the Cenozoic basalts in the NCC.…”

Petrogenesis of macrocrystic and aphanitic intrusions in Mesoproterozoic diamondiferous pipe 2 kimberlite, Wajrakarur kimberlite field, eastern Dharwar craton, southern India

“…8d) which is also a characteristic of Group I kimberlites of Kaapvaal craton (e.g., Le Roex et al, 2003) and many EDC kimberlites (e.g., Chalapathi Rao and Srivastava, 2009) and requires a trace element enriched (metasomatised) source region. Metasomatism (enrichment) of mantle source regions can be attributed to source enrichment processes like: 1) Subduction derived melts (e.g., Szabo et al, 1996;Murphy et al, 2002;Gaffney et al, 2007;Coe et al, 2008) and; 2) metasomatizing alkaline fluids or melts derived from the upwelling (asthenospheric) mantle, enriching the overlying sub-continental lithospheric mantle (SCLM) (e.g., Wyllie, 1987;McKenzie, 1989;Foley, 1992;Le Roex et al, 2003;Becker and Le Roex, 2006;Tappe et al, 2012). Furthermore, Tappe et al (2013) recently demonstrated that geochemical affinity between kimberlites and OIB's can be generated by the melting of OIB type material such as seamount chains being transported into subduction zones enriching the overlying asthenosphere with OIB type melts which subsequently sampled by the kimberlites.…”