The formation of mugearitic magma by contamination

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Authors:Le Bas, M. J.
Author Affiliations:Primary:
Leicester Univ., Dep. Geol., Leicester, United Kingdom
Volume Title:Indian Mineralogist
Source:Indian Mineralogist, p.108-123. Publisher: Mineralogical Society of India, Mysore, India. ISSN: 0019-5928
Publication Date:1985
Note:In English. 17 refs.Sukheswala Volume; illus. incl. 5 tables, geol. sketch map
Summary:Mugearite is normally considered to be a basaltic rock produced by the fractionation of alkali basalt in the basalt-hawaiite-mugearite-trachyte differentiation series. The large Tertiary strato-volcanoes of Elgon, Napak and Kisingiri in E Uganda and W Kenya, although predominantly nephelinitic, include some mugearite lavas, particularly near the base of the volcanic piles, but there are no basalts associated with them. It is shown that the geochemistry of the various mugearitic developments in these volcanoes is best explained by a process of contamination of the nephelinitic magma by granitic material during its passage through the continental crust. [J.M.H.]
Subjects:Alkali basalts; Basalts; Cenozoic; Chemical composition; Continental crust; Crust; Dilution; Enrichment; Genesis; Igneous rocks; Magmas; Miocene; Mugearite; Neogene; Petrology; Pollution; Processes; Protoliths; Tertiary; Volcanic rocks; Africa; East Africa; Kenya; Uganda; Eastern Uganda; Elgon; Kisingiri; Lake Victoria Province; Napak; Western Kenya
Abstract Numbers:86M/2393
Record ID:1987042274
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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