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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008 190110s1985 ii a 0 0 eng d
040 |a ViAlAGI  |c ViAlAGI 
072 7 |a 05A  |2 georeft 
100 1 |a Le Bas, M. J.  |e analytic author  |u Leicester Univ., Dep. Geol., Leicester 
245 1 4 |a The formation of mugearitic magma by contamination 
300 |a p. 108-123 
500 |a In English. 17 refs.Sukheswala Volume 
500 |a Abstract number: 86M/2393 
500 |a Abstractor: J.M.H. 
500 |a Affiliation: Leicester Univ., Dep. Geol.; Leicester; GBR; United Kingdom 
500 |a Key title: Indian Mineralogist 
500 |a Source note: Indian Mineralogist, p.108-123. Publisher: Mineralogical Society of India, Mysore, India. ISSN: 0019-5928 
500 |a Publication type: journal article 
504 |b 17 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a 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. 
650 7 |a Alkali basalts  |2 georeft 
650 7 |a Basalts  |2 georeft 
650 7 |a Cenozoic  |2 georeft 
650 7 |a Chemical composition  |2 georeft 
650 7 |a Continental crust  |2 georeft 
650 7 |a Crust  |2 georeft 
650 7 |a Dilution  |2 georeft 
650 7 |a Enrichment  |2 georeft 
650 7 |a Genesis  |2 georeft 
650 7 |a Igneous rocks  |2 georeft 
650 7 |a Magmas  |2 georeft 
650 7 |a Miocene  |2 georeft 
650 7 |a Mugearite  |2 georeft 
650 7 |a Neogene  |2 georeft 
650 7 |a Petrology  |2 georeft 
650 7 |a Pollution  |2 georeft 
650 7 |a Processes  |2 georeft 
650 7 |a Protoliths  |2 georeft 
650 7 |a Tertiary  |2 georeft 
650 7 |a Volcanic rocks  |2 georeft 
651 7 |a Africa  |2 georeft 
651 7 |a East Africa  |2 georeft 
651 7 |a Kenya  |2 georeft 
651 7 |a Uganda  |2 georeft 
653 |a Eastern Uganda 
653 |a Elgon 
653 |a Kisingiri 
653 |a Lake Victoria Province 
653 |a Napak 
653 |a Western Kenya 
773 0 |t Indian Mineralogist  |d Mysore : Mineralogical Society of India, 1985  |x 0019-5928  |y INMLA2  |n Indian Mineralogist, p.108-123. Publisher: Mineralogical Society of India, Mysore, India. ISSN: 0019-5928 Publication type: journal article  |h illus. incl. 5 tables, geol. sketch map