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Structures of Ophiolites and Dynamics of Oceanic Lithosphere (Paperback, Softcover reprint of the original 1st ed. 1989)
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Structures of Ophiolites and Dynamics of Oceanic Lithosphere (Paperback, Softcover reprint of the original 1st ed. 1989)
Series: Petrology and Structural Geology, 4
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1.1. HISTORICAL DEVELOPMENT OF THE OPHIOLITE CONCEPT. Ophiolite,
Greek for 'the snake stone', appears to have received its first
written definition by Brongniart (1813) as a serpentine matrix
containing various minerals. Later in 1821 and 1827, Brongniart
determined that volcanic and gabbroic rocks were also present,
associated with cherts, and he ascribed an igneous origin to the
ophiolite. Amstutz (1980) gives an excellent exegesis of these
early contributions and traces the further use of the term and
concept of ophiolite. This concept had been forged in the western
Alps and Apennines where, thanks to talented Italian geologists, in
particular A. Sismonda, B. Gastaldi, V. Novarese and S. Franchi,
the study on metamorphic ophiolites (the 'pietre verdi') has
rapidly progressed. At the tum of the century the association of
radiolarite, diabase, gabbro (euphotide), and
serpentinite-peridotite was clearly identified, even through their
metamorphic transformations. In 1902, Franchi developed the
hypothesis introduced earlier by Lotti (1886), of a submarine
outflow to explain the 'pietre verdi' association, on the basis of
the attribution of the variolites and metamorphic prasinites to an
hypabyssal volcanism, also responsible for the formation of
radiolarites. Thus, before the popular work of Steinmann in 1927,
the various components constituting an ophiolite had been
identified and its hypabyssal origin proposed. As recalled by
Amstutz (1980), the so-called 'Steinmann trinity', which consists
of the association of radiolarites, diabases and serpentinites, was
more completely and better defined in these earlier works.
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