Amino acid racemization for several DSDP samples (Table 1), supplement to: Katz, Barry J; Harrison, Christopher G A; Man, Eugene H (1983): Geothermal and other effects on amino acid racemization in selected Deep-Sea Drilling Project cores. Organic Geochemistry, 5(3), 151-156


Kinetic parameters for the epimerization of isoleucine in multispecific foraminiferal asemblages were used to establish the effects of burial depth and the geothermal gradient on the extent of reaction. It was observed that with a little as thirty meters of burial in a normal thermal regime there were differences between the extent of epimerization measured and that which would have been predicted for thermal equilibrium with bottom water temperatures. As would be expected, these differences are greatest when the heat flow (the geothermal gradient) and/or the sedimentation rates are highest. These effects were observed in most of the DSDP samples studied, and have been used to estimate the average heat flux since the time of sample deposition. Occasional anomalous effects were observed which could not be related to past or present heat flux. These were determined to be due to such geologic occurrences as slumping and reworking or to recent sample contamination. Other problems emerged related to bottom water temperatures including changes over geologic time which are unknown and could not be deduced. Thus, the presence of epimerization anomalies in DSDP cores as noted above limits the effectiveness of amino acid geochronology in such cores, unless these anomalies can be recognized as ab initio.

Related Identifier
Metadata Access
Creator Katz, Barry J; Harrison, Christopher G A; Man, Eugene H
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1983
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 67 data points
Discipline Earth System Research
Spatial Coverage (-95.737W, -30.890S, 123.846E, 59.933N); North Atlantic/RIDGE; Indian Ocean/Red Sea/TROUGH; Indian Ocean//FRACTURE ZONE; Indian Ocean//TROUGH; South Atlantic/HILL; Mediterranean Sea/BASIN; North Pacific
Temporal Coverage Begin 1968-12-24T00:00:00Z
Temporal Coverage End 1975-05-11T00:00:00Z