Mineralogy and composition of manganese crusts and nodules and sediments from the Manihiki plateau and adjacent areas: Results of HMNZS Tui Cruises |
| |
| Authors: | P Walter G P Glasby W L Plüger H Kunzendorf M A Meylan |
| |
| Institution: | 1. Umweltgeologie , Schandeinstr. 30, Speyer‐am‐Rhein, Germany;2. Department of Earth Sciences , University of Sheffield , P. O. Box 594, Sheffield, S10 2UH, England;3. Institut für Angewandte Lagerst?ttenlehre , RWTH Aachen , Süsterfeldstr. 22, Aachen, Germany;4. Environmental Science and Technology Department , Ris? National Laboratory , Roskilde, Denmark;5. Department of Geology , University of Southern Mississippi , Hattiesburg, MS, USA |
| |
| Abstract: | Forty‐four sediment samples and 23 Mn crusts and Mn nodules have been analyzed for several elements in order to characterize their geochemical nature. Most of the Mn crusts and Mn nodules are of hydrogenous origin, although one crust (U375) from the flanks of the Rarotonga volcano is thought to be of hydrothermal origin. δ‐MnO2 is the principal Mn mineral in the crusts, whereas todorokite and birnessite occur in addition to δ‐MnO2 in the nodules. The sediments can be divided into carbonates, with calcite as the dominant phase, and deep‐sea clay, consisting mainly of illite and smectite. |
| |
| Keywords: | manganese crusts manganese nodules Manihiki Plateau sediments |
|
|
