Abstract
Abstract Marriner, N.; Pirazzoli, P.A.; Fontugne, M.; Geerout, M.; Guillaume, M.M.M., and Reyss, J.L., 2012. A geomorphological reconnaissance of Tromelin Island, Indian Ocean. Tromelin is a small coral reef island (∼1 km2) located in the Indian Ocean, approximately 440 km E of Madagascar and 580 km N of La Reunion. Despite the presence of a permanent Meteo France weather station on Tromelin since the 1950s, a detailed geomorphological study of the island has never been undertaken. In this paper, we describe the geomorphology of the atoll, detailing seven geomorphological zones from the outer reef to the atoll crown. We also discuss Holocene relative sea-level changes in the light of new radiometric datings. Uranium–thorium dating of a remnant mid-Holocene reef-flat yielded an age of 5700 ± 400 years and could be interpreted as a relative sea level approximately 1.2 m above present. Subsequent possible sea-level positions have been inferred from coral conglomerates left by high-energy waves. These conglom...
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