REE distribution in some layered migmatites

constraints on their petrogenesis

verfasst von: Wilhelm Johannes, Francois Holtz, P. Möller
Abstract: The REE distributions in mesosomes, neosomes, leucosomes and melanosomes of four layered migmatites have been investigated. In one example (Arvika migmatites) the REE patterns in adjacent paragneisses, the presumed parent rock of the migmatites, were also determined. REE patterns of neosomes and mesosomes of Arvika migmatites are similar to the finegrained layers and coarse-grained layers, respectively, observed in the adjacent paragneiss. This is in agreement with the layer-by-layer paragneiss-migmatite transformation model. The REE patterns of mesosomes and neosomes indicate that these lithologies may have been closed systems (for REE) during the formation of the migmatites. No indication of metasomatic reactions, melt segregation or injection could be detected. Within the neosomes, leucosomes are depleted and melanosomes enriched in REE contents. This is interpreted to be due to separation and concentration of accessory minerals (monazite, epidote, allanite, zircon, sphene, apatite, garnet) into the melanosomes. The behaviour of accessory minerals during migmatite formation is closely allied to that of biotite, which is also concentrated in the melanosomes.
Organisationseinheit(en): Institut für Mineralogie
Externe Organisation(en): Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum (GFZ)
Centre national de la recherche scientifique (CNRS)
Typ: Artikel
Journal: Lithos
Band: 35
Seiten: 139-152
Anzahl der Seiten: 14
ISSN: 0024-4937
Publikationsdatum: 06.1995
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Geologie, Geochemie und Petrologie
Elektronische Version(en): https://doi.org/10.1016/0024-4937(95)00003-X (Zugang: Unbekannt)

BibTeX

@article{1adbdff8eaf64997ae2b60de9a064181,
title = "REE distribution in some layered migmatites: constraints on their petrogenesis",
abstract = "The REE distributions in mesosomes, neosomes, leucosomes and melanosomes of four layered migmatites have been investigated. In one example (Arvika migmatites) the REE patterns in adjacent paragneisses, the presumed parent rock of the migmatites, were also determined. REE patterns of neosomes and mesosomes of Arvika migmatites are similar to the finegrained layers and coarse-grained layers, respectively, observed in the adjacent paragneiss. This is in agreement with the layer-by-layer paragneiss-migmatite transformation model. The REE patterns of mesosomes and neosomes indicate that these lithologies may have been closed systems (for REE) during the formation of the migmatites. No indication of metasomatic reactions, melt segregation or injection could be detected. Within the neosomes, leucosomes are depleted and melanosomes enriched in REE contents. This is interpreted to be due to separation and concentration of accessory minerals (monazite, epidote, allanite, zircon, sphene, apatite, garnet) into the melanosomes. The behaviour of accessory minerals during migmatite formation is closely allied to that of biotite, which is also concentrated in the melanosomes.",
author = "Wilhelm Johannes and Francois Holtz and P. M{\"o}ller",
note = "Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",
year = "1995",
month = jun,
doi = "10.1016/0024-4937(95)00003-X",
language = "English",
volume = "35",
pages = "139--152",
journal = "Lithos",
issn = "0024-4937",
publisher = "Elsevier",
number = "3-4",
}