page_title: Tahiti
section_title: Geology
hierarchical_section_title: Tahiti / Geography / Geology
context_page_description: Tahiti is the largest island of the Windward group of the Society Islands in French Polynesia, located in the central part of the Pacific Ocean. Divided into two parts, Tahiti Nui and Tahiti Iti, the island was formed from volcanic activity; it is high and mountainous with surrounding coral reefs. Its population is 133,627 inhabitants, making it the most populous island of French Polynesia and accounting for 68.7% of its total population.
  Tahiti is the economic, cultural, and political centre of French Polynesia, an overseas collectivity of the French Republic. The capital of French Polynesia, Papeete, is located on the northwest coast of Tahiti. The only international airport in the region, Faa'a International Airport, is on Tahiti near Papeete. Tahiti was originally settled by Polynesians between 300 and 800 AD. They represent about 70% of the island's population, with the rest made up of Europeans, Chinese, and those of mixed heritage. The island was part of the Kingdom of Tahiti until its annexation by France in 1880, when it was proclaimed a colony of France, and the inhabitants became French citizens.
context_section_description: The Society archipelago is a hotspot volcanic chain consisting of ten islands and atolls. The chain is oriented along the N. 65° W. direction, parallel to the movement of the Pacific Plate. Due to the plate movement over the Society hotspot, the age of the islands decreases from 5 Ma at Maupiti to 0 Ma at Mehetia, where Mehetia is the inferred current location of the hotspot as evidenced by recent seismic activity. Maupiti, the oldest island in the chain, is a highly eroded shield volcano with at least 12 thin aa flows, which accumulated fairly rapidly between 4.79 and 4.05 Ma. Bora Bora is another highly eroded shield volcano consisting of basaltic lavas accumulated between 3.83 and 3.1 Ma. The lavas are intersected by post-shield dikes. Tahaa consists of shield-stage basalt with an age of 3.39 Ma, followed by additional eruptions 1.2 Ma later. Raiatea consists of shield-stage basalt followed by post-shield trachytic lava flows, all occurring from 2.75 to 2.29 Ma. Huahine consists of two coalesced basalt shield volcanoes, Huahine Nui and Huahine Iti, with several flows followed by post-shield trachyphonolitic lava domes from 3.08 to 2.06 Ma. Moorea consists of at least 16 flows of shield-stage basalt and post-shield lavas from 2.15 to 1.36 Ma. Tahiti consists of two basalt shield volcanoes, Tahiti Nui and Tahiti Iti, with an age range of 1.67 to 0.25 Ma.
caption: Diadem Mountain at Sunset, Tahiti, John LaFarge, c. 1891, Brooklyn Museum
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