10Be Dating of large manganese nodules from world oceans

Sharma, P. ; Somayajulu, B. L. K. (1982) 10Be Dating of large manganese nodules from world oceans Earth and Planetary Science Letters, 59 (2). pp. 235-244. ISSN 0012-821X

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0012-821X(82)90128-5


The results of 10Be and 9Be measurements in several sections of ten large manganese nodules are presented along with U and Th isotope data on five of them. The 10Be and 10Be/9Be methods yield growth rates (covering a period of 5-10 Ma) which are in excellent agreement with each other. In three cases, these rates are also in very good agreement with those derived from the 230Th methods, whereas in the other two the 230Th-based rates are faster by over a factor of two. Based on the discrepancy between the inventory of 10Be (as well as 230Th) in nodules and the overhead seawater column, it is calculated that the former scavenge their Be and Th isotopes from 2-900 m of the overhead water column. The deduced 9Be concentrations of ocean water based on its 10Be contents and the 10Be/9Be ratios of nodule surfaces are found to be in good agreement with the direct 9Be measurements of seawater implying that 9Be in nodules (like 10Be) is mostly authigenic.

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