Article (Scientific journals)
The crustal tongue melting model and the origin of massive anorthosites
Duchesne, Jean-Clair; Liégeois, Jean-Paul; Vander Auwera, Jacqueline et al.
1999In Terra Nova, 11, p. 100-105
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Keywords :
polybarism; crustal sources; orogenic processes; AMCG plutonism; HAOM
Abstract :
[en] Recent detailed field studies in several anorthosite complexes have shown that anorthosites are frequently linked with weakness zones in the crust which favour their emplacement at mid-crust levels. Recent experimental data have also shown that the parent magma compositions of various anorthosite massifs lie on thermal highs in the relevant phase diagrams, indicating that these magmas cannot be derived by fractionation of peridotitic mantle melts but rather are produced by melting of gabbronoritic sources. In the Sveconorwegian province terrane boundaries have been traced in deep seismic profiles to Moho offsets or to tongues of lower crustal material underthrust to depths of 40-50 km. We therefore suggest that the parent magmas of anorthosite massifs are produced by melting of gabbronoritic rocks from the lower crust that had been thrust into the mantle by collision of terranes.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Duchesne, Jean-Clair ;  Université de Liège - ULiège > Département de géologie > Pétrologie et géochimie endogènes
Liégeois, Jean-Paul ;  Africa Museum, Tervuren > Département de géologie
Vander Auwera, Jacqueline ;  Université de Liège - ULiège > Département de géologie > Pétrologie et géochimie endogènes
Longhi, John;  Lamont-Doherty Earth Observatory, Palisades, USA
Language :
English
Title :
The crustal tongue melting model and the origin of massive anorthosites
Publication date :
1999
Journal title :
Terra Nova
ISSN :
0954-4879
eISSN :
1365-3121
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
11
Pages :
100-105
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 November 2008

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