Paleozoic age of the Capo Spartivento Orthogneiss, Sardinia, Italy

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Authors:Ludwig, K. R.; Turi, Bruno
Author Affiliations:Primary:
U. S. Geol. Surv., Denver, CO, United States
Univ. Rome, Italy
Volume Title:Chemical Geology; Isotope Geoscience Section
Source:Chemical Geology; Isotope Geoscience Section, 79(2), p.147-153. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0168-9622
Publication Date:1989
Note:In English. 15 refs.; illus. incl. 2 tables
Summary:Zircon U/Pb isotope dating of this orthogneiss, proposed as a possible Precambrian basement of S Sardinia, shows that this rock is Caledonian in age. Conventional multi-grain analyses yield an imprecise age of roughly 480 m.y., and ion-microprobe analyses of cores of single grains yield a consistent age of 449 m.y. Though some inherited grains of Proterozoic age are present in the zircon population, they are neither abundant nor consistent with Caledonian growth of new zircons within an older protolith. [Authors' abstract] [P.Br.]
Subjects:Absolute age; Dates; Geochronology; Gneisses; Metamorphic rocks; Nesosilicates; Ordovician; Orthogneiss; Orthosilicates; Paleozoic; Silicates; U/Pb; Zircon; Zircon group; Europe; Italy; Sardinia Italy; Southern Europe; Capo Spartivento Orthogneiss; Southern Sardinia
Abstract Numbers:90M/1263
Record ID:1989064392
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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