444 C. Chemical Oceanography OL R (1983) 30 (6)

Bull. lnst. G~ol. Bassin Aquitaine, 31/32:311-323. Grant Inst. of Geol., Univ. of Edinburgh, West Mains Rd., Edinburgh EH9 3JW, Scotland.

C180. Geochemistry, biogeochemistry (see also D-SUBMARINE GEOLOGY AND GEO- PHYSICS)

83:3273 Elderfield, H. and J.M. Gieskes, 1982. Sr isotopes in

interstitial waters of marine sediments from Deep Sea Drilling Project cores. Nature, Lond., 300(5892):493-497.

~7Sr/S~'Sr ratios are sensitive indicators of diagenesis in dispersed volcanic matter and in carbonates; effects of basalt and continental debris alterations are minimal (except possibly for hydrothermal signals). Carbonate recrystallization has a significant effect, but diffusion of non-radiogenic Sr from interstitial waters has only a small effect on the oceanic STSr/~6Sr ratio. Dept. of Earth Sci., Univ. of Cambridge CB2 3EQ, UK.

83:3274 Emerson, Steven, Varis Grundmanis and David

Graham, 1982. Carbonate chemistry in marine pore waters: MANOP sites C and S. Earth planet. Sci. Lefts, 61(2):220-232.

Discussed are the "stoichiometry of predicted alka- linity and total CO 2 response to organic matter degradation,' calcite saturation in Pacific carbonate sediments, and sampling artifacts caused by pressure changes. The calculations of alkalinity and total CO~ indicate that traditional stoichiometric reactions differ 'from the true values by about 10% during oxygen and MnO 2 reduction and about 40% during denitrification.' Sch. of Oceanogr., Univ. of Wash- ington, Seattle, Wash. 98195, USA. (msg)

83:3275 Hattori, Akihiko, 1982. The nitrogen cycle in the sea

with special reference to biogcochemical pro- cesses. (Lecture.) J. oceanogr. Soc. Japan, 38(4): 245-265. Ocean Res. Inst., Univ. of Tokyo, Nakano-ku, Tokyo 164, Japan.

83:3276 Jahnke, Richard, David Heggie, Steven Emerson

and Varis Grundmanis, 1982. Pore waters of the central Pacific Ocean: nutrient results. Earth planet. Sci. Letts, 61(2):233-256.

Pore waters from siliceous and calcareous ooze sites were analyzed for nutrients, carbonate system

species, Mn -'+, Ca 2+, alkaline earth metals and dissolved 02 (siliceous site only). Similar results were obtained for siliceous ooze samples analyzed by shipboard techniques and in an in-situ harpoon sampler; results (ZCO 2, alkalinity, PO 4 and Ca) for calcareous samples, however, differed according to the analytical procedure. Differences appear due to respiration. A model of pore water 02 and NO 3 and sediment POC is developed and applied to the data: the supply of organic C to the sediment is the primary determinant of pore water profiles. Scripps Inst. of Oceanogr., La Jolla, Calif. 92093, USA. (mjj)

83:3277 Mangelsdorf, P.C. Jr. and F.L. Sayles, 1982. Mui-

ticomponent electrolyte diffusion corrections for North Atlantic sediment. Am. J. Sci., 282(10): ! 655-1665.

Chemical concentration data for North Atlantic sediments are analyzed using Lasaga's (1979) ion- pairing model for ion-ion interactions in multi- component diffusion. Corrections for pH and a CI adjustment are included. Not much is gained by this detailed analysis as inclusion of ion-ion interactions does not significantly change flux estimates based on simple, direct calculation ignoring all ion interac- tions. Any corrections for ion interactions could be applied to average oceanic fluxes. Dept. of Phys., Swarthmore Coll., Swarthmore, Penn. 19081, USA. (mjj)

83:3278 Martinet, J., P. Hocquellet, C. Saint Felix and O.

Sobesky, 1982. Major and minor metal concen- trations of coastal Atlantic waters of Martinique. Carib. J. Sci., 17(1/4):163-172. UER Sci., CUAG, B.P. 592, 97167 Pointe a Pitre, Gua- deloupe, French West Indies.

83:3279 Pfeiffer. Georg, Ulrich Forstner and Peter Stoffers,

1982. Speciation of reducible metal compounds in pelagic sediments by chemical extraction. Sene- kenberg, marit., 14(I/2):23-38.

Three different extractants were investigated for their usefulness (alone or in sequence) in differ- entiating reducible phases of transition metals. Optimum extraction times and solid:solution ratios were determined. Dithionite buffer is not recom- mended; oxalate buffer (pH 3) was the best. Acidified hydroxylamine hydrochloride buffer (pH 2) is useful for studying 'diagenetic remobilization and enrichment of metals in Mn/Fe concretions.' Inst. fur Sediment., Univ. Heidelberg, Im Neuen- heimer Feld 236, D-6900 Heidelberg 1, FRG. (mjj)