(Table 2) U and Th isotopic compositions of authigenic carbonates, bottom- and pore water and 230Th/234U ages of authigenic carbonates


Notes: All given statistical errors are two standard deviations of the mean (2Sigma). The used decay constants are: Lamda234U = 2.8262 x 10-6 a-1 (Cheng et al., 2000b); Lamda238U = 1.55125 x 10-10 a-1 (Jaffey et al., 1971); Lamda230Th = 9.158 x 10-6 a-1 (Cheng et al., 2000b). Corrections for U and Th chemistry blanks are negligible. Column 2: Subsamples of one carbonate sample are represented by numbers following letters. Samples labeled 'a' and 'b' are different aliquots of the same sample before dissolution. Column 11: The measured 234U/238U activity ratios (delta234U(0)) are presented as deviation permil from the equilibrium value, delta234U(0) = {(234U/238U) x (lamda234/lamda238) - 1} x 1000 (Edwards et al., 1987). Column 13: The decay-corrected 234U/238U activity ratios (delta234U(T)) are calculated from the Th corrected ages (column 10) delta234U(T) = delta234U(0) x e(lamda234*t) (Edwards et al., 1987). Column 17: Maximum ages are calculated using the equation: (230Th/238U) = 1 - e(lamda230t) + [delta234U(0)] - 0.001 x [lamda230/(230Th - lamda234)] x [1 - e((lamda234 - lamda230)t)]. Column 19: Best age estimate corrected for the effect of detrital Th. The uncertainty on the age correction is deduced from an uncertainty of +-50% on the 230Th/232Th activity ratio of 1.92.

DOI https://doi.org/10.1594/PANGAEA.769895
Related Identifier IsPartOf https://doi.org/10.1594/PANGAEA.769953
Related Identifier References https://doi.org/10.1016/S0016-7037(03)00128-5
Related Identifier References https://doi.org/10.1016/j.gca.2004.01.001
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.769895
Creator Teichert, Barbara M A ORCID logo; Eisenhauer, Anton ORCID logo; Bohrmann, Gerhard ORCID logo; Haase-Schramm, Alexandra; Bock, Barbara; Linke, Peter ORCID logo
Publisher PANGAEA
Publication Year 2003
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 534 data points
Discipline Earth System Research
Spatial Coverage (-125.153W, 44.448S, -125.030E, 44.674N); Oregon Vent
Temporal Coverage Begin 1996-06-01T21:58:00Z
Temporal Coverage End 2000-08-09T00:00:00Z