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.
Suggested Citation
Bloch, S., 1981, Antipathetic magnesium-manganese relationship in basal metalliferous sediments: Chemical Geology, v. 33, no. 1-4, p. 101-113, https://doi.org/10.1016/0009-2541(81)90088-7.
| 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 |