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A hydrothermal deposit from the floor of the Gulf of Aden

Published online by Cambridge University Press:  05 July 2018

J. R. Cann ,
C. K. Winter  and
R. G. Pritchard
J. R. Cann
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ
C. K. Winter
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ
R. G. Pritchard
Affiliation:
School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ
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Summary

Fragments of a hydrothermal deposit, partly moulded on pieces of basalt lava, were dredged from the edge of the median valley in the centre of the Gulf of Aden. The deposit consists of two main components, manganese oxide in the form of spongy brown to hard black lumps and coatings, and friable green massive smectite. There are smaller amounts of an iron-oxide component, and mixed manganese-oxide-smectite material. Contents of the less mobile trace elements in the smectite are too low for it to have formed by alteration of basalt glass, and it is interpreted as a direct precipitate from hydrothermal solution. None of the components is enriched in Cu or Zn, or contains appreciable amounts of sulphur. If there are sulphides in this deposit, they must lie beneath the parts sampled.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 318 , June 1977 , pp. 193 - 199
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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Footnotes

1

Present address: Dept. of Geology, The University, Newcastle-upon-Tyne, NE1 7RU.

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