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Chemical composition of basal metalliferous sediments from DSDP Leg 9

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 Mn(2+), 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.

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Cite this as

Bloch, Salman (1981). Dataset: Chemical composition of basal metalliferous sediments from DSDP Leg 9. https://doi.org/10.1594/PANGAEA.705173

DOI retrieved: 1981

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.705173
Author Bloch, Salman
Given Name Salman
Family Name Bloch
Source Creation 1981
Publication Year 1981
Resource Type application/zip - filename: Bloch_1981
Subject Areas
Name: Chemistry

Name: Lithosphere

Related Identifiers
Title: Antipathetic magnesium-manganese relationship in basal metalliferous sediments
Identifier: https://doi.org/10.1016/0009-2541(81)90088-7
Type: DOI
Relation: IsSupplementTo
Year: 1981
Source: Chemical Geology
Authors: Bloch Salman .