Mineral chemistry, bulk composition and source of the ferromanganese nodules nuclei from the Central Indian Ocean Basin
Abstract
Nuclei of ferromanganses nodules from the Central Indian Ocean Basin show the presence of abundant plagioclase feldspars (1-3 mm diameter). They are indentified as calcic plagioclase (peak at 3.20 A). Plagioclase chemical composition (CaO 6.4-20.5%) shows a range of An 44-90%. The mineral chemistry, together with the bulk composition of the host nuclei, indicate that they are of bassaltic composition. A possible source could be the numerous seamounts in this basinal area
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