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Nkumbwa Hill Carbonatite (Nkombwa Hill Carbonatite), Isoka, Isoka District, Muchinga Mts., Northern Province, Zambia

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Latitude & Longitude (WGS84): 10° 10' South , 32° 52' East
Latitude & Longitude (decimal): -10.16667,32.86667
Köppen climate type:Cwa : Monsoon-influenced humid subtropical climate


Carbonatite plug, consisting of fairly homogeneous white, medium- to fine-grained ankeritic dolomite carbonatite (rauhaugite) which is cut by sills and dykes, 1 to 2 m wide, of medium- to coarse-grained ferrocarbonatite. The west-central part of the plug is intensely silicified. The Nkombwa Hill carbonatite is deficient in calcium, as evidenced by the absence of calcite carbonatite, but has high magnesium and fluorine contents, reflected in the abundance of dolomite and phlogopite, and the presence of fluorite, apatite, sellaite, and isokite.

Located about 15 miles east of Isoka.


Mineral List


19 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

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Alphabetical List Tree Diagram

Geochronology

Mineralization age: Cryogenian : 704 Ma to 654 Ma

Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
Precambrian
 Proterozoic
  Neoproterozoic
   Cryogenian
ⓘ Carbonatite (youngest age)654 Ma
ⓘ Phlogopite (youngest age)654 Ma
ⓘ Carbonatite (oldest age)704 Ma
ⓘ Phlogopite (oldest age)704 Ma

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Ectasian - Calymmian
1200 - 1600 Ma



ID: 3184920
Mesoproterozoic crystalline metamorphic rocks

Age: Mesoproterozoic (1200 - 1600 Ma)

Lithology: Orthogneiss/paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Appleton J.D., Bland D.J., Nancarrow P.H., Styles M.Z., Mambwe S.H., Zambezi P. (1992) The occurrence of daqinshanite-(Ce) in the Nkombwa Hill carbonatite, Zambia. - Mineralogical Magazine, 56, p. 419-422.
Hughes J M, Yunxiang N (1994) A high-precision crystal structure refinement of daqingshanite-(Ce) from Nkombwa Hill carbonatite, Zambia. Mineralogical Magazine 58, 493-496
Zambezi, P., Voncken, J.H.L., Hale, M., and Touret, J.L.R. (1997): Bastnäsite-(Ce) at the Nkombwa Hill carbonatite complex, Isoka District, northeast Zambia. Mineralogy and Petrology 59, 239-250.
Berger, V.I., Singer, D.A., and Orris, G.J. (2009): Carbonatites of the World. Explored Deposits of Nb and REE - Database and Grade and Tonnage Models. USGS Open-File Report 09-1139.

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