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We present major and trace element and Sr–Nd–Pb–Hf–Os isotopic data for the 76–58 Ma Western Cape melilitite province, an age-progressive magmatic lineation in which primitive olivine melilitite intrusives and alkali basalt lavas have been emplaced on the southwestern margin of South...
The dioritic Velfjord plutons (∼448 Ma) were emplaced into regional migmatitic metapelitic and metacarbonate rocks at mid-crustal levels, corresponding to pressures of ∼700 MPa. Exhumation to ∼400 MPa began while the migmatites were in a partly molten state. With increasing proximity to the...
The lower-crustal section exposed in the Serre, southern Italy, consists mainly of Al-rich metasediments, which underwent granulite-facies metamorphism, partial melting and melt extraction. The paper considers the formation of melts in metapelites and metagreywackes. Leucosomes and host rocks...
Mineral and whole-rock chemical data for peridotite xenoliths in basaltic lavas on Spitsbergen are examined to reassess mechanisms of melt–fluid interaction with peridotites and their relative role versus melt composition in mantle metasomatism. The enrichment patterns in the xenoliths on...
Juvenile ejecta from the September and October 1995 eruptions of Ruapehu volcano, New Zealand, indicate that mixing occurred between relatively higher- and lower-temperature (high-T and low-T) andesitic magmas. Compositional zonations in clinopyroxene phenocrysts provide direct evidence for a...
Several spinel peridotite xenoliths from Spitsbergen have Sr–Nd isotopic compositions that plot to the right of the ‘mantle array’ defined by oceanic basalts and the DM end-member (depleted mantle, with low 87 Sr/ 86 Sr and high 143 Nd/ 144 Nd). These xenoliths also show strong...
The role of residual garnet during melting beneath mid-ocean ridges has been the subject of many recent investigations. To address this issue from the perspective of melting residues, we obtained major and trace element mineral chemistry of residual abyssal peridotites from the Central Indian...
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