The influence of nodule versus crust morphology on the composition of seamount-hosted ferromanganese minerals
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Abstract
Ferromanganese mineral precipitation in the global oceans is ubiquitous, occurring in the form of both crusts and nodules at a broad range of depths and seafloor terrains. Although ferromanganese crusts and nodules are both composed of ferromanganese minerals, mineralogy and mean element concentrations compiled for regional crust versus nodule occurrences differ. Notably, most published compilations compare nodules from abyssal plain sediments to crusts forming on seamounts, and do not address the question as to whether mineral morphology may affect the composition of crusts and nodules in addition to environmental factors. To address this, we have compiled a dataset of co-located hydrogenetic (seawater sourced) open-ocean ferromanganese crusts and seamount-hosted nodules. The preliminary data presented here support our hypothesis that co-located crusts and nodules exhibit similar compositions, both in terms of their mineralogy and mean element concentrations, as well as overall variance in concentrations for any given element. These data indicate that local processes influence sample-to-sample variation in both crusts and nodules, in contrast to broader ferromanganese variation reported between open-ocean seamounts- hosted crusts and abyssal plain-hosted nodules.
Suggested Citation
Mizell, K., Piper, E., Blackburn, T., Gartman, A., 2025, The influence of nodule versus crust morphology on the composition of seamount-hosted ferromanganese minerals, 18th SGA Biennial Meeting, v. 3, Golden, CO, August 3-7, 2025, p. 1051-1054.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | The influence of nodule versus crust morphology on the composition of seamount-hosted ferromanganese minerals |
| Volume | 3 |
| Year Published | 2025 |
| Language | English |
| Publisher | Society for Geology Applied to Mineral Deposits |
| Contributing office(s) | Pacific Coastal and Marine Science Center |
| Description | 4 p. |
| First page | 1051 |
| Last page | 1054 |
| Conference Title | 18th SGA Biennial Meeting |
| Conference Location | Golden, CO |
| Conference Date | August 3-7, 2025 |