Structure, Petrography and Emplacement of Plutonic Rocks

  • G. Troll
  • S. Weiss

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.

Keywords

Crystallization Quartz Recrystallization Fractionation Assimilation 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • G. Troll
  • S. Weiss

There are no affiliations available

Personalised recommendations