1. Preliminary U-series data in Cape Basin sediments
Feifei Deng
Supervisors: Prof. Gideon M. Henderson,
Dr. Alex L. Thomas

2. Oceanic behavior of the daughters
238U -> 234Th
235U -> 231Th -> 231Pa
234Pa -> 234U -> 230Th
particle scavenging

3. 230Th as a constant flux proxy
230Th flux reaching the seafloor (F) = 230Th production in the overlying water column (P):
FTh = PTh = Z . (234U) . λ230
234U -> 230Th z
230Thxs = (230Th)measure – (230Th)detrital – (230Th)authigenic
Flux of any component, i, to sediment:
Fi = Z . (234U) . λ230 . fi / 230Thxs
fi : the weight fraction of component i in the sediment.

4. Aims of study To access the accuracy of constant 230Thxs flux model
To access the seafloor processes that might have an impact on the preservation of sedimentary (231Pa/230Th)xs record.

5. Sampling locations- D357 13 8 3 ss 11 6 ss First leg Second leg
test 1 2
3ss 4 5
6ss 7
8 (0.5)
9 (1.5)
10 (2.5)
12 (3.5)
11ss (4.5)
13 (0.75)
First leg
Second leg
3 ss 8
6 ss 11 13

6. 230Thxs

8. (231Pa/230Th)xs

9. Thank you!