Disequilibrium melting in granulite-facies metasedimentary rocks of the northern Serre (Calabria, southern Italy)

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doi: 10.1007/s007100070015
Authors:Del Moro, A.; Fornelli, A.; Piccarreta, G.
Volume Title:Mineralogy and Petrology
Source:Mineralogy and Petrology, 70(1-2), p.89-104. Publisher: Springer-Verlag, Vienna, Austria. ISSN: 0930-0708
Publication Date:2000
Note:In English with German summary; illus., incl. sect., 3 tables, geol. sketch map
Summary:Leucosomes, mesosomes and melanosomes, including 12 leucosome-host rock pairs have been studied for Sr and Nd isotopic systematics in migmatitic metapelites of the Serre which experienced granulite facies conditions in Hercynian times. The leucosomes occurring in the migmatites are mainly K-poor peraluminous leucotonalites; the host rocks are depleted in 'granitic' component. Sm/Nd ratios are generally lower in the leucosomes and Rb/Sr ratios are very low. The isotopic Sr and Nd values vary in a wide range within the various kinds of host-rocks and within the leucosomes. The isotopic Sr and Nd values of the leucosomes are less variable than the host-rocks. The leucosomes define a hyperbolic trend where most samples concentrate in the middle part. These features are interpreted as reflecting melting of several rock types generating melts having a weighted mean composition from the contributing sources. The prevailing leucotonalites and their very low Rb/Sr ratios indicate that plagioclase played a more important role than mica in the melting processes which produced the studied leucosomes. Since assemblages lacking or very poor in biotite and K-feldspar are common in metapelitic restites, potassic melts, as one should expect from melting of micas, must have been extracted before the leucosomes under study formed. [H.E.]
Sections:Geochemistry
Subsections:Metamorphic rocks
Subjects:Alkali metals; Alkaline earth metals; Chemical composition; Facies; Granulite facies; Isotopes; Leucosomes; Melting; Metals; Metamorphic rocks; Metasedimentary rocks; Migmatites; Petrography; Rubidium; Strontium; Calabria Italy; Europe; Italy; Southern Europe; Serre Italy
Abstract Numbers:01M/1883
Record ID:2003080970
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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