Devil's Island (Kourou) Devil's Island (Kourou) Devil's Island (French: Île du Diable) is the third-largest island of the Salvation's Islands, an island group in the Atlantic Ocean. It is located approximately 14 km (9 mi) off the coast of French Guiana in South America just north of the town of Kourou. It has an area of 14 ha (34.6 acres). The island was a part of a controversial French penal colony located in French Guiana for 101 years, from 1852 to 1953. Although it was the smallest part of the penal colony, it is notorious for being used for internal exile of French
Ocean island basalt much closer to the Earth's surface in the asthenosphere. The existence of mantle plumes and hotspots has, however, been hotly debated since they were first proposed in the 1960s and 1970s. There are various sources identified for ocean island basalt magma in Earth’s mantle. These mantle sources are inferred from differences in radiogenic isotope ratios that magmas inherit from their source rock. Sources have been defined from a combined analysis of strontium (Sr), neodymium (Nd) and lead (Pb) isotopes. The sources as defined by radiogenic isotopes are: Ocean island basalt Ocean island basalts (OIB) are basaltic rocks found on many