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Geochemistry of the Chattanooga shale, Dekalb County, central Tennessee.

Southeastern Geology

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Abstract

This Upper Devonian shale is of interest because of its unusual enrichment in trace elements, especially U; a new chemical analysis for major, minor and trace elements is presented. Stable isotopes of carbon (organic) show delta 13C approx -29per mille and for total sulphur show -21 to -27per mille delta 34S. The organic matter was found to range from dominantly marine (Dowelltown member) to dominantly terrestrial (Gassaway member) by extraction-column chromatography-GS and also by pyrolysis-GS of kerogen. Trace elements U, Mo, Co, Zn, Cu, Ni, V, As and Hg are enriched in the organic- and sulphide-rich units. This enrichment can be related to a euxinic depositional environment, to a very slow sedimentation rate (approx 2 mm/1000 years), to the type of organic matter that varied from mainly marine to terrestrial, and to the source of the metals, which shows abundance variations that originated, at least in part, from volcanic ash layers.-R.S.M.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geochemistry of the Chattanooga shale, Dekalb County, central Tennessee.
Series title:
Southeastern Geology
Volume
24
Issue:
3
Year Published:
1983
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Southeastern Geology
First page:
101
Last page:
116
Number of Pages:
16