Concentrations of trace elements, 10Be, and 26Al in marine opal from sediments of ODP Hole 177-1093 ...

• Main Authors: Lal, D, Charles, Christopher D, Vacher, L, Goswami, J N, Jull, A J Timothy, McHargue, L, Finkel, R C
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2006
• Subjects: Composite Core; Leg177; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.710927; https://doi.pangaea.de/10.1594/PANGAEA.710927

Here, we provide evidence suggesting that marine (diatom) opal contains not only a high fidelity record of dissolved oceanic concentrations of cosmic ray-produced radionuclides, 10Be and 26Al, but also a record of temporal variations in a large number of trace elements such as Ti, Fe, Zn and Mn. This finding is derived from measurements in purified biogenic opal that can be separated from detrital materials using a newly developed technique based on surface charge characteristics. Initial results from a sediment core taken near the present-day position of the Antarctic Polar Front (ODP Site 1093) show dramatic changes in the intrinsic concentrations of, Be, Al, Ti, Fe, Mn and Zn in the opal assemblages during the past ~140 kyr BP. The results imply appreciable climatically controlled fluctuations in the level of bioreactive trace elements. The time series of total Be, Al, Ti, Fe and 10Be in the sediment core are all well correlated with each other and with dust records in the polar ice cores. The ... : Supplement to: Lal, D; Charles, Christopher D; Vacher, L; Goswami, J N; Jull, A J Timothy; McHargue, L; Finkel, R C (2006): Paleo-ocean chemistry records in marine opal: Implications for fluxes of trace elements, cosmogenic nuclides (10Be and 26Al), and biological productivity. Geochimica et Cosmochimica Acta, 70(13), 3275-3289 ...