Géologie, géochimie et géochronologie de l'île de Bora Bora (Société, Polynésie française)
作者： Sylvain Blais , Gérard Guille , Hervé Guillou , Catherine Chauvel , René C Maury
DOI: 10.1016/S1251-8050(00)01456-7
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摘要: Geology, geochemistry and geochronology of Bora island (Society islands, French Polynesia). island, located at the northwestern edge Society archipelago represents upper part a shield volcano made up pile meter-thick alkali basalt flows rare hawaiites. The summit caldera (4.4 km in diam- eter) is still recognisable southwestern tilting volcanic edifice led to relative uplift northern eastern parts volcano. lavas derive from low partial melting degrees an EMII mantle source composition which was influenced by continental materials. subaerial activity corresponding presently emerged portion took place between 3.45 3.10 Myr. Such ages are consistent with formation being above hot spot considered as fixed Pacific plate motion 11 cm·yr -1 . © 2000 Academie des
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