Figure 4.
Correlation between Ba flux in subducted sediment and Ba
enrichment of arc basalts for various arcs (Ant = Northern
Antilles, Mar = Mariana, T= Tonga, Mex = Mexico, J = Java, Al =
Aleutians, and G = Guatemala) around the world (after Plank and
Langmuir, 1993). Open circles = three different sediment flux
estimates for the Mariana, based on the three ODP Sites drilled
during Leg 129 (800-802) (Plank and Langmuir, 1998). Although
there are variations from site to site, the average sediment input
to the Mariana is fairly well constrained (± 20%). Note Izu
volcanics are lower in Ba/Na than Mariana volcanics by a factor of
two. B. Contrasting Pb isotopic composition of Mariana (open
circle) and Izu-Bonin (solid circle) arc volcanics. Mariana
volcanics form a mixing trend (arrow), almost perfectly coincident
with mixtures of ODP Hole 801C sediment (open boxes) and basalt
(solid boxes) averages.
To 185 Figure 5
To 185 Table of Contents