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Geochronology and geochemistry of Ferrar rocks from North Victoria Land, Antarctica

Pietro Brotzu, Giuseppe Capaldi, Lucia Civetta, Giovanni Orsi, Gabriella Gallo and Leone Melluso
Geochronology and geochemistry of Ferrar rocks from North Victoria Land, Antarctica
European Journal of Mineralogy (June 1992) 4 (3): 605-617

Abstract

K-Ar determinations on two igneous units from north Victoria Land, representative of the Ferrar Dolerite and Kirkpatrick Basalt, yield dates ranging from 144 to 180 Ma. The oldest date is in agreement with a Rb-Sr isochron age of 182 Ma provided by most of the analyzed samples. It is considered to represent the age of the magmatic activity which produced the two suites; younger dates are attributed to argon loss subsequent to cooling. The chemical compositions of the rocks range from basaltic andesite to dacite. Major-element mass balance, trace element modelling, isotopic and geothermometric data, all imply a closed-system differentiation history from basaltic andesite to dacite. The normalized trace element contents of the least evolved basaltic andesite studied are intermediate between those of low-TiO2 and high-TiO2 lavas from the Mesa Range to the south. Major and trace element modelling show that the studied basaltic andesites can be derived by crystal fractionation processes from the least differentiated low-TiO2 rocks, and in turn may generate high-TiO2 rocks by crystal fractionation. (Auth. mod.)


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 4
Serial Issue: 3
Title: Geochronology and geochemistry of Ferrar rocks from North Victoria Land, Antarctica
Affiliation: Universita di Napoli, Dipartimento di Scienze della Terra, Naples, Italy
Pages: 605-617
Published: 199206
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 40
Accession Number: 1995-056320
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
Secondary Affiliation: CNR, ITA, ItalyUniversita di Ferrara, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States
Update Code: 199520
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