Geotermometria isotopica dei processi anatettici ercinici del Massiccio dell' Argentera (Alpi Marittime)  [Isotopic geothermometry of Hercynian anatexis in Argentera Massif, Alpes-Maritimes]

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Alternate Title:Isotopic geothermometry of Hercynian anatexis in Argentera Massif, Alpes-Maritimes
Authors:Fornaseri, M.; Preite Martinez, M.; Turi, B.; Malaroda, R.
Author Affiliations:Primary:
Univ. Roma, Ist. Geochim., Rome 00185, Italy
Volume Title:Atti/Convegno della Societá Italiana di Mineralogia e Petrologia
Source:Rendiconti della Società Italiana di Mineralogia e Petrologia, 38(3), p.1219-1232; Societá italiana di mineralogia e petrologia; Convegno, Rende-Cetraro, Italy, Oct. 27-31, 1982. Publisher: Editrice Succ. Fusi., Pavia, Italy. ISSN: 0037-8828
Publication Date:1982
Note:In Italian with English summary. 1 p. refs.; illus. incl. 14 anal., 2 tables, geol. sketch map
Summary:Oxygen isotope ratios were measured on coexisting minerals from nine typical rocks (embrechites, anatexites, gneisses, granites and intermediate types) from various zones of the Argentera massif, Maritime Alps. In six samples, the isotopic T calculated from the 18O fractionation between quartz and alkali feldspar range approx 450°-500°C. This is a consequence of the narrow range of 18O/16O exhibited by both quartz (delta 18O 10.92-11.72) and feldspar (delta 180 9.02-10.00). Quartz from all of these rocks is isotopically very similar to that from a Permian sandstone cropping out around the massif (delta 18O 11.44). Biotite from one sample of this group, a granite from the core zone of the massif, was also analysed. The excellent concordance between the quartz-feldspar and quartz-biotite T suggests that isotopic equilibrium was approached in the assemblage. The other three rocks studied (a granite-gneiss, a gneiss and a biotite conglomeratic embrechite) are isotopically different from one another, as well as from those of the group discussed above. [J.M.H.]
Subjects:Alkali feldspar; Anatexis; Anatexite; Biotite; Data; Feldspar group; Framework silicates; Geochemistry; Geologic thermometry; Granites; Igneous rocks; Isotopes; Magmas; Metamorphic rocks; Mica group; Migmatites; O-18/O-16; Oxygen; Petrology; Plutonic rocks; Quartz; Sheet silicates; Silica minerals; Silicates; Stable isotopes; Structural geology; Temperature; Variscan Orogeny; Alpes-Maritimes France; Alps; Argentera Massif; Europe; France; Italy; Maritime Alps; Piemonte Italy; Southern Europe; Western Alps; Western Europe
Abstract Numbers:85M/4250
Record ID:1986036941
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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