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Partition geochemistry of sediments from DSDP 424 in the Galapagos Hydrothermal Mounds Field

Published online by Cambridge University Press:  05 July 2018

S. P. Varnavas  and
D. S. Cronan
S. P. Varnavas
Affiliation:
Applied Geochemistry Research Group, Department of Geology, Imperial College, London
D. S. Cronan
Affiliation:
Applied Geochemistry Research Group, Department of Geology, Imperial College, London
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Abstract

Sediments from DSDP 424, a core taken in a hydrothermal mound in the Galapagos Mounds Field, comprise biogenic oozes, siliceous ash-rich layers and two varieties of hydrothermal precipitates, an Fe-rich clay (nontronite), and Mn oxides. Compositionally, these sediments differ considerably from one another and vary in proportion down the core to basement. Geochemical partition studies on the sediments have indicated a variable fractionation of the elements that they contain between clays, carbonate, and Mn oxides with the hydrothermal phases being strongly depleted in trace elements. The hydrothermal sediments are thought to have been formed as a result of the fractional precipitation of Fe silicates and Mn oxides from ascending hydrothermal solutions which are depleted in trace elements due to subsurface precipitation of sulphides, and have had insufficient time to scavenge trace metals from sea water due to their rapid precipitation.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 335 , September 1981 , pp. 325 - 331
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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Footnotes

*

Present address: Department of Geology, University of Patras, Patras, Greece.

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