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Geotectonics

, Volume 41, Issue 6, pp 487–500 | Cite as

Structure and composition of the oceanic lithosphere created at different spreading rates

  • S. A. PalandzhyanEmail author
Article

Abstract

The specific features of the oceanic lithosphere (the petrography, the mineral composition, and the petrochemistry of igneous rocks and restites) that indicate its formation at different spreading rates, from the extremely slow to fast, are considered. This evidence may be used for solution of the inverse problem of estimating, at least qualitatively, the rate of paleospreading from the structure and composition of rocks pertaining to the ophiolitic association. The use of petrochemical data as the criteria of paleospreading rate is limited. The anomalous composition and structure of the oceanic crust may be due to factors unrelated to the spreading rate. The well-studied cases of ophiolites interpreted as fragments of the ancient oceanic lithosphere formed under conditions of fast, slow, and extremely slow spreading rates are discussed. It is concluded tentatively that the fast spreading is typical of the ophiolites obducted on passive margins (the Periarabian, Uralian, and Appalachian-Caledonian belts) as fragments of ensimatic suprasubduction basins formed at the final stages of the evolution of paleooceans (Tethys and Iapetus). Ophiolites as products of slow spreading are commonly localized in accretionary (subduction-related) orogens at the present-day and older active continental margins.

Keywords

Partial Melting Spreading Rate Oceanic Lithosphere Backarc Basin Spreading Center 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Pleiades Publishing, Inc. 2007

Authors and Affiliations

  1. 1.Geological InstituteRussian Academy of SciencesMoscowRussia

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