caa a22 4500 445390093 CHVBK 20180317143044.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00710-011-0149-7 doi (NATIONALLICENCE)springer-10.1007/s00710-011-0149-7 Geochemistry of microgranular enclaves in Aligoodarz Jurassic arc pluton, western Iran: implications for enclave generation by rapid crystallization of cogenetic granitoid magma [Elektronische Daten] [Amir Esna-Ashari, Jamshid Hassanzadeh, Mohammad-Vali Valizadeh] Microgranular enclaves are common in the Jurassic Aligoodarz granitoids of western Iran. Enclaves Enclosed in Granodiorite (EEG) and Enclaves Enclosed in Tonalite (EET) are different but they overlap their hosts on variation diagrams. The EEG is compositionally intermediate between tonalite and granodiorite. Mixing between tonalitic and granodioritic magmas and fractional crystallization are two models examined as the origin of the EEG. Field, textural, mineralogical and chemical observations suggest that chemical equilibration, common in magma mixing, was not attained between the EEG and its host. This, together with other observations does not support magma mixing as a mechanism for forming the EEG. Alternatively, excessive nucleation of biotite ± Fe-Ti-oxides ± amphibole by rapid cooling at borders of a shallow magma chamber and later fragmentation and dispersal by dynamic arc plutonism best explains the EEG. However, channeling of a new magma into the nearly solid tonalitic host explains formation of the EET. Springer-Verlag, 2011 Esna-Ashari Amir School of Geology, College of Science, University of Tehran, Tehran, Iran aut Hassanzadeh Jamshid Tectonics Observatory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA aut Valizadeh Mohammad-Vali School of Geology, College of Science, University of Tehran, Tehran, Iran aut Mineralogy and Petrology Springer Vienna 101/3-4(2011-03-01), 195-216 0930-0708 101:3-4<195 2011 101 710 https://doi.org/10.1007/s00710-011-0149-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-011-0149-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Esna-Ashari Amir School of Geology, College of Science, University of Tehran, Tehran, Iran aut NATIONALLICENCE 700 1- Hassanzadeh Jamshid Tectonics Observatory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA aut NATIONALLICENCE 700 1- Valizadeh Mohammad-Vali School of Geology, College of Science, University of Tehran, Tehran, Iran aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer Vienna 101/3-4(2011-03-01), 195-216 0930-0708 101:3-4<195 2011 101 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer