Abstract
The two-phase Ballachulish pluton is composed of a zoned monzodiorite - quartz diorite envelope with distinct flow- and deformation-foliation, surrounding a core of porphyritic granite with hybrid margins. Mesotype members of this suite are constituted of alkaline hypersthene diorites. This provides an unique opportunity to quantify the magmatic crystallization sequence within a relatively “dry” plutonic environment at upper crustal level, in terms of \( T - X - {f_{{o_2}}} \) evolution (Weiss and Troll, Chap. 4, this Vol.). The present chapter starts with a gross megascopic description of the igneous rocks. Section 3.2 deals with contact relationships, xenoliths and foliation structures, followed by a modal classification of the igneous units (Sect. 3.3.1). A detailed petrography of index minerals, their texture and areal distribution (Sect. 3.3.2) precede the synoptical Sect. 3.4 on magma emplacement and intrusion mechanics.
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© 1991 Springer-Verlag Berlin Heidelberg
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Troll, G., Weiss, S. (1991). Structure, Petrography and Emplacement of Plutonic Rocks. In: Voll, G., Töpel, J., Pattison, D.R.M., Seifert, F. (eds) Equilibrium and Kinetics in Contact Metamorphism. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76145-4_3
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DOI: https://doi.org/10.1007/978-3-642-76145-4_3
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-76147-8
Online ISBN: 978-3-642-76145-4
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