Mathematics – Logic
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..163s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 2, pp.163-171
Mathematics
Logic
14
Scientific paper
Suspended matter from the surface waters of the Amazon Estuary were collected during May and June 1976 on the `R/V Alpha Helix', and their major-element compositions (Al, Si, Ti, K, Mg, Ca, P, Fe and Mn) were measured. Between salinities of 0 and 10%. the suspended material, predominantly terrigenous in derivation, decreases in load from 500 to 3 mg/l, but has a chemical composition which remains essentially constant. With the onset of a large amount of biological productivity at approximately 10%. salinity, there are large increases in the ratios of Si / Al , P / Al , Ca / Al , Mg / Al , Ti / Al and Mn / Al which are maintained at higher salinities. Calculations of "excess" concentrations of elements held in the non-terrigenous components of the suspended material further support our main conclusion that Si, P, Ca, Mg, Ti and Mn are incorporated into the skeletal and organic phases of marine phytoplankton (predominately diatoms) of the Amazon Estuary. The data suggest, but with less certainty, that Fe and K follow the above elements. This study has demonstrated that the chemical composition of river-introduced suspended matter can be significantly altered by biological activity within estuarine waters as can be the geochemical cycle of inorganic elements.
Price Brian N.
Sholkovitz Edward R.
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