Geochemical and tectonic implications of igneous rocks from ODP Leg 114, sub-antarctic South Atlantic


P.A. Mueller, M.R. Perfit, A.L. Heatherington, P.D. Kirk, and E. Schandl (1992) Geo-Marine Letters, 12, 214-222

Abstract


Igneous rocks recovered from three major tectonic features of the sub-antarctic South Atlantic Ocean during ODP Leg 114 have a range of compositions: Northeast Georgia Rise, basalt to andesite; Meteor Rise, basalt to trachyte; spreading center in the West South Atlantic Basin, MORB-like basalt. Major and trace element as well as Sr and Nd isotopic data clearly indicate that all rocks share the enriched elemental and isotopic signatures typical of both hotspot and mid-ocean ridge volcanism in the southern ocean basins. Data for the Northeast Georgia and Meteor Rises also suggest the influence of older, continental lithosphere.


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