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Île Saint-Paul

Island in the southern Indian Ocean

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  • 3 chapters
L' île Saint-Paul (au premier plan la roche Quille)
B.navez · CC BY-SA 3.0

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Through Island, Indian Ocean and Portugal

It is an important breeding site for seabirds. A scientific research cabin on the island is used for scientific or ecological short campaigns, but there is no permanent population. It is under the authority of a senior administrator on Réunion.

Geography

Île Saint-Paul is a volcanic island with a triangular shape that measures no more than 5 km (3.1 mi) at its widest point. It is the top of an active volcano; the volcano last erupted in 1793 (from its SW flank), and is rocky with steep cliffs on the east side. The thin stretch of rock that used to close off the crater collapsed in 1780, admitting the sea through a 100 m (330 ft) channel; the entrance is only a few meters deep, thus allowing only very small ships or boats to enter the crater. The interior basin, 1 km (0.62 mi) wide and 50 m (160 ft) deep, is surrounded by steep walls up to 270 m (890 ft) high. There are active thermal springs.

The island is antipodal of Cheyenne County, Colorado, one of the few places in the continental United States with a non-oceanic antipode.

Geology

The island is located on the mainly under sea Amsterdam-Saint Paul Plateau which is of volcanic hotspot origin, with the currently active Amsterdam-Saint Paul hotspot believed to be located close to the island. The aphyric (no phenocrysts) basalts found on Saint Paul are distinct from other basalts found to date on the Amsterdam-Saint Paul Plateau, being mildly alkalic, incompatible element-enriched and highly fractionated. The island is no more than 400,000 years old and was formed by magma that was a simple binary mixture between upper mantle and the Amsterdam-Saint Paul hotspot plume.

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