Preliminary U-series data in Cape Basin sediments

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Presentation transcript:

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

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

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.

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.

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

230Thxs

(231Pa/230Th)xs

Thank you!