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 Ocean island basalt Ocean island basalts (OIB) are basaltic rocks found on many volcanic islands away from tectonic plate boundaries, typically associated with hot spots. Ocean island basalts are found on islands and volcanoes located on oceanic crust. The chemical composition of these basalts can vary from tholeiite to alkali basalt within the same island group, but it is never calc-alkaline. During the shield volcano stage of many hotspot islands, tholeiitic OIBs build up most of the volcano's structure. Following the post-erosional stage this is usually accompanied by violent eruptions of alkali basalt and other more evolved volcanic rocks with