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Geochemistry and origin of the Bald Knob manganese deposit, North Carolina

Economic Geology

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Abstract

Geochemical and textural evidence for the submarine hydrothermal origin of the Bald Knob Mn deposit, North Carolina, is preserved in a mineralogically diverse suite of rocks that have experienced amphibolite facies metamorphism. Manganese- and Mn-Fe-rich lithologies have high Mn/Fe ratios and low concentrations of Ni, Cu, Zn, U, Th, and rare earth elements that are similar to concentrations reported from other ancient manganiferous deposits and from crusts and sediments which are forming in hydrothermally active regions of the present sea floor. The association of the manganiferous lithologies with chert and meta-igneous rocks is consistent with deposition of the sediments in a rifting environment, such as a back-arc basin, or possibly, a midocean ridge. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geochemistry and origin of the Bald Knob manganese deposit, North Carolina
Series title:
Economic Geology
Volume
87
Issue:
8
Year Published:
1992
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Economic Geology
First page:
2023
Last page:
2040
Number of Pages:
18