Abstract
Nias Island, located in the eastern Indian Ocean, is part of the emergent, non-volcanic outer-arc ridge which marks the western margin of the Sunda Forearc Basin of northwestern Sumatra. The island is structurally divided into three main sub-basins and a basement high by three prominent SE-striking faults. Geologically it consists of three principal units; basement ophiolite complex, Oligocene to Recent sedimentary rocks and diapiric mélange. The recovery of indigenous radiolarians from a chert sample in the Mujoi Sub-basin constrains the oldest age of emplacement of the ophiolitic basement as Middle Eocene. The finding of Miocene diatomite in the Lahewa Sub-basin is interpreted as the product of upwelling effects and probably coincides with one of the cooling intervals recognized from other parts of the world.
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