Journal article

Igneous and metamorphic enclaves in the S-type Deddick Granodiorite, Lachlan fold Belt, SE Australia: Petrographic, geochemical and Nd-Sr isotopic evidence for crustal melting and magma mixing

R Maas, IA Nicholls, C Legg

Journal of Petrology | Published : 1997


The Deddick Granodiorite, a mafic S-type pluton in the Lachlan Fold Belt, contains abundant enclaves. Most are derived from high-grade metasediments of pelitic-psammitic composition, and migmatites are common. Among these, discrete fragments of melanosomes rich in cordierite and garnet are restites from partial melting. However, compositional and Nd-Sr isotopic data indicate they are not restite in equilibrium with the melt component of the host magma, but may have formed part of a spectrum of diverse magma source lithologies. Alternatively, they may be accidental xenoliths. Regardless of their origin, data for these enclaves suggest their precursors could represent deeply buried age equival..

View full abstract

Citation metrics