Geochemical evidence for melt migration and reaction in the upper mantle

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

“…Actually, in ultramafic xenoliths MREEenrichment with respect to HREE (e.g., high Tb/Yb ratios; Figs. 5b and c) and, more generally, the variable (from depleted to enriched) contents in highly incompatible trace elements (Nb, Ta, Rb, Ba and U), might be explained as the chromatographic effect induced by plumederived melts percolating through a depleted peridotite and affecting incompatible elements and REE in order of increasing partition coefficient (up to MREE; Bodinier et al, 1990;Takazawa et al, 1992;Bedini et al, 1997).…”

Geochemical and Os isotopic characteristics of a fresh harzburgite in the Hayachine-Miyamori ophiolite: Evidence for melting under influx of carbonate-rich silicate melt in an infant arc environment

“…Normalizing values are from Sun and McDonough (1989). The broken lined area is as the fi elds of peridotites from the Horoman peridotite complex (Takazawa et al, 1992;Yoshikawa and Nakamura, 2000).…”

Steady-state Mantle-Melt Interactions in One Dimension: I. Equilibrium Transport and Melt Focusing

“…difference in the compositions of the dunite residues in columns that differ in the amount of melt focusing. Consequently, as discussed by Kelemen et al (1997), it roman peridotite (Takahashi, 1992;Takazawa et al, is difficult to do more than place a lower bound on the 1992), the Trinity peridotite (Quick, 1981; melt flux required to produce a dunite vein; further melt al., 1992), the Josephine peridotite (Dick, 1976(Dick, , 1977 flux beyond this point may leave no detectable trace. Kelemen & Dick, 1995), and the Oman ophiolite [Kelemen et al (1997) and references therein].…”