Petrography of the Ambela granitic complex, NW Pakistan

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Authors:Rafiq, Mohammad; Jan, M. Qasim
Author Affiliations:Primary:
University of Peshawar, National Centre of Excellence and Department of Geology, Peshawar, Pakistan
Volume Title:Geological Bulletin, University of Peshawar
Source:Geological Bulletin, University of Peshawar, Vol.21, p.27-48. Publisher: University of Peshawar, Department of Geology, Peshawar, Pakistan. ISSN: 0367-4045
Publication Date:1988
Note:In English. 30 refs.; illus., incl. 7 tables, geol. sketch map
Summary:The Ambela granitic complex occupies the southeastern part of the Buner subdivision of Swat. It is a composite batholith consisting of a variety of oversaturated (70%), saturated (20%), and undersaturated rocks (50%). The batholith may have formed over a considerable length of time, spanning from middle to late Paleozoic. Petrographic studies (800 thin section) allow a three fold grouping of the rocks. Group I includes granites, alkali granites and microporphyrites; these appear to represent the early magmatic episode of the complex. Group II includes quartz syenites, alkali quartz syenites, syenites, feldspathoidal syenites, carbonatite, ijolite, lamprophyre, and associated pegmatites and fenites. Considerable metasomatic changes were associated with successive alkali rich intrusive phases of this group of rocks. Basic dykes (Group III), intruding both Group I and II rocks, represent the last magmatic episode and constitute about 5% of the complex. This paper presents petrographic details of the various types of rocks in the complex.
Subjects:Batholiths; Carbonatites; Dikes; Fenite; Folds; Granites; Igneous rocks; Ijolite; Intrusions; Lamprophyres; Mafic composition; Magmatism; Metamorphic rocks; Metasomatic rocks; Metasomatism; Middle Paleozoic; Paleozoic; Pegmatite; Plutonic rocks; Syenites; Upper Paleozoic; Asia; Indian Peninsula; North-West Frontier Pakistan; Pakistan; Swat Pakistan; Ambela Complex; Buner Pakistan; Microporhyrites
Coordinates:N340500 N343000 E0725500 E0721500
Abstract Numbers:94M/2416
Record ID:2000013766
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute.
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