Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2873m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 11, pp.2873-2882
Physics
2
Scientific paper
Concentrations of Ge(OH) 4 (denoted as Ge i , or inorganic germanium) and Si(OH) 4 were measured in water column and pore water samples from San Pedro and San Nicolas Basins in the Southern California Borderlands. There is a characteristic linear relationship between Ge i and Si in the water column which implies that the distributions of germanium and silica are controlled by similar processes. In contrast, the pore water chemistry of germanium appears to differ from that of silica, particularly in the reducing, organic-rich sediments of San Pedro Basin. Silica concentrations in San Pedro Basin pore water asymptotically increase to 480 M at 35-40 cm depth. Ge i concentrations in the topmost 2 cm of pore water from San Pedro Basin are an order of magnitude greater than bottom water concentrations. Below 2 cm, Ge i concentrations decrease exponentially with a half-distance of about 8 cm. Cycling of ferric oxyhydroxides at a redox boundary is the most likely cause of the Ge i enrichment in San Pedro Basin pore water, while authigenic pyrite formation with the concomitant inclusion of germanium is a probable, but undocumented, cause of the downcore decrease in Ge i . Pore water Ge i and silica concentrations in sediments of San Nicolas Basin are generally greater than bottom water concentrations but vary irregularly with depth, probably due to irrigation.
Hammond Douglas E.
Leslie B.
Murnane R. J.
Stallard Robert F.
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