Hf–Nd evidence for the origin and distribution of mantle domains in the SW Pacific

Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc

“…This interpretation suggests that patterns in Hf-Nd isotope variability for island arc lavas may generally reflect not only the isotopic composition of local subducted sediment, but also the bulk Nd/Hf of that sediment. This view is consistent with data from Mariana and northern Luzon arcs in the western Pacific, where a strong pelagic clay component with high Nd/Hf is present in the subducting package, and where flat mixing trends on Hf-Nd isotope plots are common (Pearce, et al, 1999, Woodhead, et al, 2001, Marini, et al, 2005, Pearce, et al, 2007, Todd, et al, 2010, Tollstrup, et al, 2010). …”

Evidence for recycled plate material in Pacific upper mantle unrelated to plumes

“…However, the Dupal or EM-1 signature observed along mid-ocean ridges in the northern Atlantic (Schilling et al, 1999;Hanan et al, 2000;Blichert-Toft et al, 2005), Arctic (Goldstein et al, 2008;Liu et al, 2008), and Pacific (Pacific-Antarctic ridge: Vlastélic et al, 1999, Chile ridge: Klein andKarsten, 1995;Sturm et al, 1999), and observed on off-ridge or isolated seamounts in Atlantic (Castillo and Batiza, 1989;Shirey et al, 1987;Geldmacher et al, 2008) and Pacific (Vlastélic et al, 1998) (see also Electronic Annex for detailed review). The Dupal signature is also reported from western pacific marginal basins (Hickey-Vergas, 1998;Shinjo et al, 2000;Flower et al, 2001;Hoang and Uto, 2006;Pearce et al, 2007;Hickey-Vargas et al, 2008), Ontong Java Plateau (Ishikawa et al, 2007), Shiberian Traps (Ivanov, 2007), Tuva-Mongolian massif (Rasskazov et al, 2002), and Columbia River (Chesley and Ruiz, 1998). These observations highlight the heterogeneous nature of the upper mantle, not only southern hemisphere, but also in the Indian and Pacific mantle domains.…”

Boron isotopes reveal multiple metasomatic events in the mantle beneath the eastern North China Craton

“…Pearce et al, 2007;Faccenna et al, 2010;Schmandt et al, 2014;Thomson et al, 2016). The high H 2 O storage capacity (1-3% wt.)…”