The Cretaceous Igneous Province of Madagascar: Geochemistry and Petrogenesis of Lavas and Dykes from the Central-Western Sector |
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| Authors: | MELLUSO L; MORRA V; BROTZU P; MAHONEY J J |
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| Institution: | 1DIPARTIMENTO DI SCIENZE DELLA TERRA, UNIVERSITÀ DI NAPOLI FEDERICO II, VIA MEZZOCANNONE 8, 80134 NAPOLI, ITALY
2SCHOOL OF OCEAN AND EARTH SCIENCE AND TECHNOLOGY, UNIVERSITY OF HAWAII AT MANOA, 1680 EAST–WEST ROAD, HONOLULU, HI 96822, USA |
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| Abstract: | The Cretaceous lava sequence and associated mafic dyke swarmin central–western Madagascar (Mailaka and Bemaraha areas)range in composition from picrite basalts to cordierite–orthopyroxene-bearingrhyodacites (MgO from 14 to 0·6 wt %). Petrographic andchemical data indicate the presence of both tholeiitic and transitionalmagma series, with variable degree of rare earth element enrichment(La/Nd)n = 1–1·4 for tholeiites vs (La/Nd)n =0·65–1 for transitional rocks]. Initial (at 88Ma) 87Sr/86Sr and |
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