Sentences with phrase «framboidal pyrites»
Framboidal pyrites may also serve as long - term sources of contaminant uranium under conditions of slow oxidation.
https://www.pnnl.gov/
«The results were really exciting,» said Qafoku, «because this was the first time that uranium was found to be associated with naturally occurring framboidal pyrites in alluvial sediments.»
The results initially showed that the iron sulfide in the form of framboidal pyrite is abundant in the fine - grained fraction of this sediment.
«Uranium in framboidal pyrite from a naturally bioreduced alluvial sediment.»
X-ray spectroscopic analyses conducted at the Advanced Photon Source at Argonne National Laboratory confirmed that framboidal pyrite uranium occurred in both oxidized and reduced forms.
Electron microprobe analysis produced elemental mappings showing that uranium was associated with framboidal pyrite.
The % TS were high in all the examined intervals and the sedimentary sulfur occurred mainly as framboidal pyrite, indicating that sufficient sulfate, indicative of seawater, was present in the deep layer of the paleo - Arctic basin and that the pyrite was formed in the sediments under sufficient iron input.
Not exact matches
Clearly not all pyrites, framboidal or otherwise, contain high uranium, so understanding what controls uranium uptake in pyrite is a crucial next step.