Distribution of dissolved and particulate 230Th and 232Th in seawater from the Gulf of Mexico and off Cape Hatteras as measured by SIMS

Details Distribution of dissolved and particulate 230Th and 232Th in seawater from the Gulf of Mexico and off Cape Hatteras as measured by SIMS Distribution of dissolved and particulate 230Th and 232Th in seawater from the Gulf of Mexico and off Cape Hatteras as measured by SIMS

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.133..117g&link_type=abstract

Earth and Planetary Science Letters, vol. 133, Issue 1-2, pp.117-128

Computer Science

11

Scientific paper

We present vertical and horizontal profiles of dissolved and particulate 230 Th and 232 Th concentrations in seawater from shelf and slope areas of the Gulf of Mexico and off Cape Hatteras in the Middle Atlantic Bight, as measured by secondary ion mass spectrometry (SIMS), and compare the partitioning of long-lived 230 Th between particles and seawater with that of short-lived 234 Th. Concentrations of dissolved and particulate 230 Th and 232 Th in surface seawater decreased from near-shore to off-shore in the Gulf of Mexico, demonstrating terrestrial input to the surface waters. Vertical profiles indicate that lateral transport, as well as surface inputs (e.g., fluvial and aeolian) and bottom sediment resuspension, could be an important source of 230 Th and 232 Th in ocean margin regions. Sea water samples collected off Cape Hatteras contained significantly higher dissolved and particulate 230 Th and 232 Th concentrations than those found in the open Gulf of Mexico. Likely, the distributions of 230 Th and 232 Th in seawater off Cape Hatteras are, to a large extent, controlled by terrestrial particles. In contrast, in-situ production (for 230 Th) and scavenging are the major processes regulating the concentrations of dissolved 230 Th and 232 Th in the open Gulf of Mexico. The observed negative correlation between log K d (particle-solution distribution coefficient) and log C p (concentration of suspended particulate matter) for 234 Th and 230 Th xs in both study areas, demonstrated a "particle-concentration effect" down to very low C p concentrations (~ 20 g/l). Based on the 230 Th inventory, in-situ production, and the small estimated surface input, the overall residence time of 230 Th in the water column at a slope station in the Gulf of Mexico is calculated to be about 5 yr.

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