Antipathetic magnesium-manganese relationship in basal metalliferous sediments
Chemical Geology
By: S. Bloch
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Abstract
Basal metalliferous sediments from sites 77B, 80 and 81 of the Deep Sea Drilling Project represent mixtures of pelagic clay, biogenic ooze, and a metalliferous component of hydrothermal origin. The metalliferous end-member of the sediments displays a strong inverse relationship (r = -0.88) between Mg and Mn. Mg is most likely tied up in an X-ray amorphous Mg-silicate ("sepiolite"), whereas Mn occurs almost exclusively in an oxide phase. Precipitation of the Mg-rich phase is favored by high flow rates and limited mixing of the hydrothermal end-member (source of silica) with seawater (source of Mg). Under those conditions much of the hydrothermal Mn2+, with its slow oxidation kinetics, may escape to the free water column. In contrast, in highly-diluted hydrothermal fluids, which provide a source solution for Mn-rich sediments, dissolved silica is diluted below saturation with respect to "sepiolite". The separation of the Mn and Mg phases may be further compounded by hydraulic fractionation. ?? 1981.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Antipathetic magnesium-manganese relationship in basal metalliferous sediments |
| Series title | Chemical Geology |
| DOI | 10.1016/0009-2541(81)90088-7 |
| Volume | 33 |
| Issue | 1-4 |
| Year Published | 1981 |
| Language | English |
| Publisher | Elsevier |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Chemical Geology |
| First page | 101 |
| Last page | 113 |
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