Reply to Comment on ``On the importance of opal, carbonate, and lithogenic clays in scavenging and fractionating 230Th, 231Pa and 10Be in the ocean''

Details Reply to Comment on ``On the importance of opal, carbonate, and lithogenic clays in scavenging and fractionating 230Th, 231Pa and 10Be in the ocean'' Reply to Comment on ``On the importance of opal, carbonate, and lithogenic clays in scavenging and fractionating 230Th, 231Pa and 10Be in the ocean''

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.220..223l&link_type=abstract

Earth and Planetary Science Letters, Volume 220, Issue 1-2, p. 223-229.

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230Th, Distribution Coefficient, Scavenging, Sediment Remobilization

Scientific paper

We extend our analysis of the Chase et al. data [Earth and Planetary Science Letters 204 (2002) 215-229] to those other than from the equatorial Pacific and the Southern Ocean. The analysis offers support to our previous conclusion that Kd(Th) for carbonate is on the order of ~1.0×106 g/g, or about two orders of magnitude smaller than that for open-ocean lithogenics. There is a lowering of Kd(Th) of lithogenics at high-lithogenic sites attributable to factors including the sediment remobilization from ocean-margin deposits. But the lowered Kd(Th) of lithogenics is still about one order of magnitude greater than that of carbonate at those high-lithogenic sites. Using an independent method, we estimate that Kd,l(Th) is >(2.2+/-0.9)×108 g/g at stations adjacent to our EqPac sites, reinforcing our conclusion that the major scavenger for 230Th is lithogenic, not carbonate particles, even in the low-lithogenic open ocean.

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