[en] Deeply buried 1.5 Ga Polish anorthosites, accessible only by bore holes, reveal diagnostic features of some massif-type anorthosites (polybarism, jotunitic parent magma), diapirically emplaced in the mid crust together with the rapakivi granites of the EW-trending Mazury complex, intruded along a major crustal discontinuity. Geochemical modelling and isotope data corroborate recent experimental work on the basaltic system in dry conditions: the source rock of the parental magma is a gabbronorite, necessarily lying in the lower crust. Since no Archaean crust is known in the region, high initial Os-188/Os-187 ratios for sulphide-oxide isochrons and negative epsilon(Nd) values are best accounted for by melting a similar to 2.0 Ga mafic crust.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Wiszniewska, Janina; Polish Geological Institute (Poland)
Claesson, Stefan; Swedish Museum of Natural Sciences
Stein, Holly; Colorado State University > AIRIE Program
Vander Auwera, Jacqueline ; Université de Liège - ULiège > Département de géologie > Pétrologie et géochimie endogènes
Duchesne, Jean-Clair ; Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
Language :
English
Title :
The north-eastern Polish anorthosite massifs: petrological, geochemical and isotopic evidence for a crustal derivation
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