Masirah (Oman) ophiolite sheeted dykes and pillow lavas: geochemical evidence of the former ocean ridge environment |
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| Authors: | IL Abbotts |
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| Institution: | Department of Geological Sciences, University of Birmingham, England |
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| Abstract: | The island of Masirah is composed of a fully-developed, late-Mesozoic, ophiolite in which are exposed extensive tracts of regularly-trending, sheeted dyke complex and associated pillow lavas. These upper ocean-crust rocks have been subject to a hydrothermal constructive-margin metamorphism, which has had profound effects on their major and alkaline element geochemistry. Minor, trace and rare-earth element characteristics suggest: (1) the involvement of extensive magma-chamber fractional crystallisation in the development of their chemistry, (2) their origin at a former spreading centre, through whether mid-ocean or marginal basin cannot be constrained by their geochemistry alone. |
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