caa a22 4500 465790801 CHVBK 20180323112024.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00310645 doi (NATIONALLICENCE)springer-10.1007/BF00310645 Chemical modification of enclave magma by post-emplacement crystal fractionation, diffusion and metasomatism [Elektronische Daten] [Günter Eberz, Ian Nicholls] Hornblende-bearing microgranitoid enclaves from the Swifts Creek Pluton (SCP), SE-Australia display mineralogical and textural variations from their margins to their centers. Margins are fine grained and display quench textures and are enriched in amphibole, biotite and in some cases magnetite relative to their coarser grained centers. Enclaves of this type and their adjacent granitoid host rocks have been sectioned into 0.3 to 1 cm thick slabs in order to determine the chemical variations associated with these mineralogical changes. The fine grained margins are variably enriched in Ti, Al, Mg, Fe, Mg, K, Rb, Ba, Nb, Y, Sc, V, Ni and the REE up to a factor of three relative to the enclave centers. This enrichment is compensated by a depletion of Si and Zr. Elements like Ca, Na and Sr show less coherent variation from margin to center. Host rocks in immediate contact with these enclaves are depleted in Mg, Na, K, Rb and Ba relative to host rocks that are not exposed to enclaves. No one single process can account for all the variations. Instead, we propose that the chemical variations are related to a combination of in situ crystal fractionation of isolated magma globules, mass transfer by diffusion and metasomatic exchange. Springer-Verlag, 1990 Eberz Günter Institut für Petrographie und Geochemie, Universität Karlsruhe, D-7500, Karlsruhe, Federal Republic of Germany aut Nicholls Ian Department of Earth Sciences, Monash University, 3168, Clayton, Australia aut Contributions to Mineralogy and Petrology Springer-Verlag 104/1(1990-01-01), 47-55 0010-7999 104:1<47 1990 104 410 https://doi.org/10.1007/BF00310645 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00310645 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Eberz Günter Institut für Petrographie und Geochemie, Universität Karlsruhe, D-7500, Karlsruhe, Federal Republic of Germany aut NATIONALLICENCE 700 1- Nicholls Ian Department of Earth Sciences, Monash University, 3168, Clayton, Australia aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 104/1(1990-01-01), 47-55 0010-7999 104:1<47 1990 104 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer