RT Journal Article
T1 Residence and redistribution of REE, Y, Zr, Th and U duringgranulite-facies metamorphism: behaviour of accessory andmajor phases in peraluminous granulites of central Spain
A1 Villaseca González, Carlos
A1 Martín Romera, Cristina
A1 De la Rosa Díaz, Jesús Damián
A1 Barbero González, Luis C.
AB Accessory minerals are thought to play a key role in controlling the behaviour of certain trace elements such as REE, Y, Zr,Th and U during crustal melting processes under high-grade metamorphic conditions. Although this is probably the case atmiddle crustal levels, when a comparison is made with granulite-facies lower crustal levels, differences are seen in trace elementbehaviour between accessory minerals and some major phases. Such a comparison can be made in Central Spain where twogranulite-facies terranes have equilibrated under slightly different metamorphic conditions and where lower crustal xenoliths arealso found. Differences in texture and chemical composition between accessory phases found in leucosomes and leucogranitesand those of melanosomes and protholiths indicate that most of the accessory minerals in melt-rich migmatites are newlycrystallized. This implies that an important redistribution of trace elements occurs during the early stages of granulite-faciesmetamorphism. In addition, the textural position of the accessory minerals with respect to the major phases is crucial in theredistribution of trace elements when melting proceeds via biotite dehydration melting reactions. In granulitic xenoliths fromlower crustal levels, the situation seems to be different, as major minerals show high concentration of certain trace elements, thedistribution of which is thus controlled by reactions involving final consumption of Al-Ti-phlogopite. A marked redistributionof HREE–Y–Zr between garnet and xenotime (where present) and zircon, but also of LREE between feldspars (K-feldspar andplagioclase) and monazite, is suggested.
PB Elsevier Science B.V., Amsterdam.
SN 0009-2541
YR 2003
FD 2003
LK https://hdl.handle.net/20.500.14352/57015
UL https://hdl.handle.net/20.500.14352/57015
LA eng
DS Docta Complutense
RD 2 nov 2025