Angga Jati Widiatama, Happy Christin Natalia, Rinaldi Ikhram, Lauti Dwita Santy, Joko Wahyudiono, Lanang Rangga Setia Wiguna, Syifa Faranabila
Manamas volcanic rock formed due to crustal thinning in fore arc setting. This research aims to provide information and the enrichment process of rare earth elements in Manamas Formation on the Timor Island and their tectonic implication. Manamas volcanic rock exposed in Bihati River, Baun, Timor consists of two different types of basalts, namely alkaline basalt and sub alkaline basalt. Analysis using ICP-MS method shows enrichment in large ion lithophile element and high field strength element. Subalkaline basalt has N-MORB patterns and alkaline basalt have OIB patterns. The Nb element is relatively impoverished that indicates influence of subduction activities. Thorium and uranium elements also show significant enrichment, due to sedimentary rocks contamination or continental crust or directly from the asthenosphere due to magma upwelling. The two distinctive patterns interpreted due to slab tear phenomenon beneath Timor Island during Australia oceanic plate subduction and recycled oceanic crust beneath Banda Arc. © Published under licence by IOP Publishing Ltd.
Geological Engineering, Institut Teknologi Sumatera, Ryacudu Passage Road, Lampung, South Lampung, Indonesia; Center of Geoscience and Mineral Technology, Institut Teknologi Sumatera, Ryacudu Passage Road, Lampung, South Lampung, Indonesia; Centre for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources, Diponegoro Road 57, West Java, Bandung, Indonesia
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