Dupré, Bernard; White, William M; Vidal, Philipp (1985): Element contents and isotope composition of sediments and basalts from DSDP Site 78-543 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.707168, Supplement to: White, William M; Dupré, Bernard; Vidal, Philipp (1985): Isotope and trace element geochemistry of sediments from the Barbados Ridge-Demerara Plain region, Atlantic Ocean. Geochimica et Cosmochimica Acta, 49(9), 1875-1886, https://doi.org/10.1016/0016-7037(85)90082-1
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Published: 1985 (exact date unknown) • DOI registered: 2008-12-08
Abstract:
Twenty-four piston core sediment samples and 13 sediments and 3 basalts from DSDP Leg 78 Site 543 were analyzed for Sr, Nd and Pb isotopic compositions. The results show sediment with highly radiogenic Pb (206Pb/204Pb up to 19.8) and rather radiogenic Sr and unradiogenic Nd has been deposited in the region since the Cretaceous. The source of this sediment is probably the Archean Guiana Highland, which is drained by the Orinoco River. Pb and Sr isotopic compositions and sediment thickness decrease and 143Nd/144Nd increases northward due to a decrease in turbiditic component. This decrease is partly due to the damming action of basement ridges. Rare earth concentrations in the sediments are somewhat low, due to the abundance of detrital and biogenic components in the sediment and rapid sedimentation rates. Both positive and negative Ce anomalies occur in the surface sediments, but only positive Ce anomalies occur in the Site 543 sediments. It is unlikely that sediment subducted to the source region of Lesser Antilles arc magmas could be the cause of negative Ce anomalies in those magmas.
Isotopic compositions of Site 543 basalts show some effect of contamination by seawater-basalt reaction products and sediments. Beyond this, however, they are typical of “normal” depleted MORB.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 15.712300 * Longitude: -58.653700
Date/Time Start: 1981-02-28T00:00:00 * Date/Time End: 1981-02-28T00:00:00
Event(s):
78-543 * Latitude: 15.712300 * Longitude: -58.653700 * Date/Time: 1981-02-28T00:00:00 * Elevation: -5633.0 m * Penetration: 324 m * Recovery: 226.8 m * Location: North Atlantic/CONT RISE * Campaign: Leg78 (Leg78AB) * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 32 cores; 305 m cored; 19 m drilled; 74.4 % recovery
78-543A * Latitude: 15.712300 * Longitude: -58.653700 * Date/Time: 1981-02-28T00:00:00 * Elevation: -5633.0 m * Penetration: 455 m * Recovery: 64.2 m * Location: North Atlantic/CONT RISE * Campaign: Leg78 (Leg78AB) * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 16 cores; 132.5 m cored; 0 m drilled; 48.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- White, WM; Dupré, B; Vidal, P (1985): (Table 3) Isotope ratios and parent and daughter concentrations in DSDP Site 78-543 sediments and basalts. https://doi.org/10.1594/PANGAEA.707167
- White, WM; Dupré, B; Vidal, P (1985): (Table 3) Isotope ratios and parent and daughter concentrations in DSDP Site 78-543 sediments and basalts. https://doi.org/10.1594/PANGAEA.707166