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Ophiolites and oceanic crust

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Abstract

OPHIOLITES consist of a pseudostratiform sequence, of harzburgite, tectonite, ultramafic and mafic cumulates sometimes including gabbro and quartz diorite (plagiogranite) intrusions, dolerite dyke swarms, pillow lava1, and deep-sea sediments2–4. This assemblage occurs in all Phanerozoic mountain systems and is interpreted as fossil oceanic crust and uppermost mantle5–10. Outstanding problems include differences between the chemical properties of Ophiolites and rocks thought to represent present-day oceanic crust11,12, the lack in some complexes of recognised dyke swarms or cumulates, and the relative thinness of ophiolite mafic rocks compared with standard oceanic crustal sections5,8,13.

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Authors and Affiliations

  1. Geology Department, University of California, Davis, California, 95616

    E. M. MOORES

  2. US Geological Survey, Menlo Park, California, 94025

    E. D. JACKSON

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  1. E. M. MOORES
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  2. E. D. JACKSON
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MOORES, E., JACKSON, E. Ophiolites and oceanic crust. Nature 250, 136–139 (1974). https://doi.org/10.1038/250136a0

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  • DOI: https://doi.org/10.1038/250136a0

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