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Geochemistry of Buried MiocenePleistocene Ferromanganese Nodules from the Antarctic Ocean
| Content Provider | Semantic Scholar |
|---|---|
| Author | Aumento, Fabrizio Macgillivray, John |
| Copyright Year | 1975 |
| Abstract | Five nodules collected on Leg 28 of the Deep Sea Drilling Project are unique in that they provide an opportunity of studying older, buried nodules. Paleontological evidence from the cores suggests they may be from Miocene to Pliocene in age. The thinness of the ferromanganese coatings on the nuclei suggests that rapid burial took place. They differ from the few analyzed surface nodules from the South Pacific in that the Mn and Ni concentrations of the buried nodules are lower, and the Co concentrations are slightly higher. The Fe and Cu concentrations are similar. There is no evidence that either leaching or remobilization of any of these elements has taken place subsequent to burial. INTRODUCTION Five ferromanganese nodules were found in the cores collected on Leg 28 of the Deep Sea Drilling Project (Table 1). The nodules are all buried, four of them from different horizons of the same hole. The locations of the cores and the nodules within them are shown in Figure 1. Four surface nodule occurrences are also shown and are included for subsequent comparison purposes. Table 2 describes the physical characteristics of the nodules under investigation. An electron microprobe was used to determine the relative distributions of the major elements within the nodules, to compare their distribution with that known of Recent nodules, and to detect geochemical changes these nodules may have undergone during burial. EXPERIMENTAL TECHNIQUES The nodules were cut to expose their concentric layering and then mounted in epoxy. The flat surfaces so exposed were impregnated with hot, diluted epoxy under vacuum, and when this had set, they were polished. Due to the porosity and friability of the specimens the 7̂ ° 0 o Msn 85G EH -16 7 Figure 1. Locations of coring Sites 267 and 274 and sample locations for four Pacific nodules. Crosses indicate probable position of nodules on surface at time of formation. TABLE 1 Locations of Nodules from Leg 28, DSDP |
| File Format | PDF HTM / HTML |
| DOI | 10.2973/dsdp.proc.28.126.1975 |
| Alternate Webpage(s) | http://deepseadrilling.org/28/volume/dsdp28_26.pdf |
| Alternate Webpage(s) | https://doi.org/10.2973/dsdp.proc.28.126.1975 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
