How did the Seychelles granite microcontinent form?

The Seychelles islands are primarily formed of ancient felsic granite that broke away from the supercontinent Gondwana over millions of years. These granite outcrops are unique as some of the world's oldest oceanic islands and served as early evidence for continental drift. Successive stages of rifting and tectonic shifts separated the landmass from Madagascar and India before isolating it in the Indian Ocean.

What we know

• The geology of Seychelles consists of a felsic granite microcontinent that broke off from Gondwana and became isolated in the Indian Ocean. [2]
• The granites of the Seychelles Microcontinent were emplaced approximately 750 million years ago during the late Precambrian. [3]
• Alfred Wegener used the granite outcrops of the Seychelles Islands as among the earliest evidence for his continental drift theory. [3]
• The Seychelles landmass underwent multiple stages of rifting, separating first from Madagascar and later from India around 66 million years ago. [3]

Where to go next

• the bigger pictureHow did Gondwana break apart?
• whoWhat role did Alfred Wegener play in continental drift?
• compared withHow do the coralline outer islands differ from the granitic core?
• what caused itWhat is the Reunion plume?
• whenWhat are the Deccan Traps?
• an unexpected connectionHow did Alfred Wegener use these remote islands for his theory?Alfred Wegener cited the isolated granite outcrops of the Seychelles as early evidence for continental drift long before modern plate tectonics mapped out the ancient breakup of Gondwana.

Sources

• [1]Geology of the Seychelles (Wikidata Q54859441) · CC0 1.0
• [2]Geology of Seychelles · CC BY-SA 4.0
• [3]Seychelles microcontinent · CC BY-SA 4.0
• [4]Seychelles · CC BY-SA 4.0
• [5]Geography of Seychelles · CC BY-SA 4.0