Geology and Mineralogy of Zn-Pb Nonsulfide Deposits
A special issue of Minerals (ISSN 2075-163X).
Deadline for manuscript submissions: closed (30 September 2017) | Viewed by 24049
Special Issue Editor
Interests: Zn-Pb deposits; bauxites; nonsulphide Zn deposits; critical metals; laterites
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
“Nonsulfides” is a term, which has been used to define a special deposit type, considered as derived from the weathering of Zn(Pb) sulfide concentrations. Nonsulfide zinc deposits can be distinguished between supergene and hypogene, according to their mineralogy, geological characteristics and genetic setting. The supergene ores formed by weathering and oxidation, whereas the hypogene ores are considered hydrothermal, or associated with metamorphic processes on primary sulfide ores. The mineralogy of supergene deposits and their location relative to the precursor sulfide bodies reflect the composition of the primary assemblage and host rock, as well as the hydrologic regimes and climate.
The zinc minerals in supergene deposits are the carbonates smithsonite and hydrozincite, and the silicates hemimorphite and sauconite. Zinc can also be hosted in clay minerals other than smectite, as in chlorite-like clays. High amounts of Zn also occurin Mn-(hydr)oxides, as well as in Fe-(hydr)oxides and phosphates. The Zn-silicate willemite occurs only in few supergene deposits, on which there is always a hint of being partly hypogene.
The economic value of Zn-Pb nonsulfides is highly variable, and it resides on the mineralogy of the contained metals. Some technical problems encountered during processing can be thus mitigated by a better identification of the mineralogical assemblage. This should be a fundamental step in the exploration, because most extraction processes are highly sensitive to mineralogy.
If you are interested in contributing to this special issue, we encourage you to send the tentative title(s) and abstract(s) of your submission(s) to the Editorial Office ([email protected]) by 30 April 2017.
Prof. Dr. Maria Boni
Guest Editor
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Keywords
- Zn(Pb) nonsulfides
- Supergene
- Hypogene
- Mineralogy
- Exploration