Lithogenous material

Where all nuclide measurements are expressed in activities. In both expressions, the first term in curly brackets corrects for Th (or Pa) supported by U in lithogenic material, and the second term in curly brackets corrects for °Th (or Pa) ingrown from authigenic U. For samples that are known to be young, such as sediment trap or core-top samples, t = 0 and this second term equals zero reflecting the lack of time for decay of authigenic U in such samples. 

The dominant clay mineral at high latitudes is chlorite. In addition to ice rafting, lithogenous materials are transported in the polar oceans by rivers and winds. Polar seas are also characterized by diatomaceous oozes due to the occurrence of upwelling supported by divergence at 60°N and 60°S. 

Chase, Z., Anderson, R. F., Fleisher, M. Q., and Kubik, P. W. (2003). Accumulation ofbiogenic and lithogenic material in the Pacific sector of the Southern Ocean during the past 40,000 years. Deep Sea Res. Part II Top. Stud. Oceanogr. 50(3-4), 799-832. 

Windom, H.L., 1976. Lithogeneous material in marine sediments. In Riley, J.P. and Chester, R. (eds). Chemical Oceanography. Academic Press, London, New York, pp 103-135. 

Windom HE (1976) Lithogenous material in marine sediments. Chemical Oceanography vo. 5, pp. 103-135. New York Academic Press. 

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