Henderson, Gideon M.; Rendle, Rebecca H.; Slowey, Niall C.; Reijmer, John J. G. (2000): U-Th dating and diagenesis of Pleistocene highstand sediments from the Bahamas slope. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Swart, Peter K., Eberli, Gregor P., Malone, Mitchell J., Anselmetti, Flavio S., Arai, Kohsaku, Bernet, Karin H., Betzler, Christian, Christensen, Beth A., De Carlo, Eric Heinen, Dejardin, Pascale M., Emmanuel, Laurent, Frank, Tracy D., Haddad, Geoffrey A., Isern, Alexandra R., Katz, Miriam E., Kenter, Jeroen A. M., Kramer, Philip A., Kroon, Dick, McKenzie, Judith A., McNeill, Donald F., Montgomery, Paul, Nagihara, Seiichi, Pirmez, Carlos, Reijmer, John J. G., Sato, Tokiyuki, Schovsbo, Niels H., Williams, Trevor, Wright, James D., Lowe, Ginny (editor), Proceedings of the Ocean Drilling Program, scientific results, Bahamas Transect; covering Leg 166 of the cruises of the drilling vessel JOIDES Resolution, San Juan, Puerto Rico, to Balboa Harbor, Panama, sites 1003-1009, 17 February-10 April 1996, 166, 23-31, georefid:2001-002882

Abstract:
We have performed U-Th isotope analyses on pure aragonite samples from the upper sections of Leg 166 cores to assign each aragonite-rich sediment package to the correct sea-level highstand. The uppermost sediment package from each of the four sites investigated (Sites 1003, 1005, 1006, and 1007) yielded a Holocene U-Th age. Sediment packages from deeper in the cores have suffered diagenesis. This diagenesis consists of significant U loss (up to 40%) in the site nearest the platform (Site 1005), slight U gain in sites further from the platform, and continuous loss of pure (super 234) U caused by alpha recoil at all sites. The difference in diagenesis between the sites can be explained by the different fluid-flow histories they have experienced. Site 1005 is sufficiently close to the platform to have probably experienced a change in flow direction whenever the banks have flooded or become exposed. Other sites have probably experienced continuous flow into the sediment. Although diagenesis prevents assignment of accurate ages, it is sufficiently systematic that it can be corrected for and each aragonite-rich package assigned to a unique highstand interval. Site 1005 has sediment packages from highstands associated with marine isotope Stages 1, 5, 7, 9, and 11. Site 1006 is similar, except that the Stage 7 highstand is missing, at least in Hole 1006A. Site 1003 has sediment only from Stage 1 and 11 highstands within the U-Th age range. And Site 1007 has sediment only from the stage 1 highstand. This information will allow the construction of better age models for these sites. No high-aragonite sediments are seen for Stage 3 or Substages 5a and 5c. Unless rather unusual erosion has occurred, this indicates that the banks did not flood during these periods. If true, this would require the sea level for Substages 5a and 5c to have remained at least nearly equal 10 m lower than today.
Coverage:
West: -79.2733 East: -79.1408 North: 24.3346 South: 24.2359
Relations:
Expedition: 166
Site: 166-1003
Site: 166-1005
Site: 166-1006
Site: 166-1007
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.166.106.2000 (c.f. for more detailed metadata)
Data download: application/pdf
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