Composition and morphology of ferromanganese coatings on glacial erratics in Lydonia Canyon, United States East Coast

Poppe, L. J.; O'Leary, D. W.; Commeau, R. F.

Abstract:

Ferromanganese coatings have been found on glacial erratics in Lydonia Canyon, off the United States northeastern coast. The coatings, which are about 17 ??m thick, consist of an outer manganese-rich layer which covers the top of the erratic, a middle transitional layer, and an internal iron-rich layer that encircles the entire surface of the erratic. Chemical analyses of the coatings, when compared with similar data on abyssal marine ferromanganese deposits, reveal comparable Mn/Fe ratios, higher P and Ti concentrations, and an order of magnitude less of Co, Ni, Cu, and most other metals. A comparison of the Lydonia Canyon coatings with desert varnishes reveals obvious chemical, mineralogical, and morphological differences. ?? 1985 Springer-Verlag.

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Article

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70012927

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Poppe, L. J.; O'Leary, D. W.; Commeau, R. F.

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133

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English

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Geo-Marine Letters

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Composition and morphology of ferromanganese coatings on glacial erratics in Lydonia Canyon, United States East Coast; 1985; Article; Journal; Geo-Marine Letters; Poppe, L. J.; O‘Leary, D. W.; Commeau, R. F.