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Distribution of amorphous, diatom frustule, and dissolved silica in a lead- 210 dated core from Southern Lake Michigan

John A. Robbins, D.N. Edgington, J. I. Parker

Abstract

Measurements were made of $sup 210$Pb and amorphous, diatom, and dissolved silica in the same sediment core in order to assess the effect and significance of dissolution of frustule silica and to compare regeneration of interstitial silica from biogenic phases with contributions from solution of clay minerals. Methods for obtaining cores and analyzing samples for silica are described. Graphs are presented to show distribution of porosity, total $sup 210$Pb, and amorphous, diatom frustules, and dissolved silica in cores, and other data. (HLW)

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Key concepts: Frustule, Diatom, Biogenic silica, Amorphous silica, Dissolution, Dissolved silica, Amorphous solid, Geology