Geochemistry of tephra layers in ODP Site 121-758, supplement to: Dehn, Jonathan; Farrell, John W; Schmincke, Hans-Ulrich (1991): Neogene tephrochronology from Site 758 of the northern Ninetyeast Ridge: Indonesian Arc volcanism of the past 5 Ma. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 273-295

Jonathan Dehn, John W Farrell & Hans-Ulrich Schmincke
A tephrochronology of the past 5 Ma is constructed with ash layers recovered from Neogene sediments during drilling at ODP Leg 121 Site 758 on northern Ninetyeast Ridge. The several hundred tephra layers observed in the first 80 m of cores range in thickness from a few millimeters to 34 cm. Seventeen tephra layers, at least 1 cm thick, were sampled and analyzed for major elements. Relative ages for the ash layers are estimated from...
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