Early volcanic rocks of réunion and their tectonic significance |
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| Authors: | B G J Upton W J Wadsworth |
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| Institution: | 1. Department of Geology, University of Edinburgh, UK
2. Department of Geology, University of Manchester, UK
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| Abstract: | A great sequence of hydrothermally altered and tectonically disturbed lavas and breccias is exposed in the erosional cirques of Piton des Neiges volcano, Réunion. These rocks are cut by intense swarms of minor intrusives and are overlain by a carapace of younger lavas which date back at least 2 m.y. The older lavas and breccias are believed to have been formed by submarine eruption of basalt magma during the pre-emergent growth stages of the volcano. It is suggested that their subsequent elevation to 2000 m. above sealevel is due to the thrusting of oceanic crust from the north-east, associated with movements along NE-SW fractures in the western Indian Ocean floor. |
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