Cassiterite mineralization in vein-type deposits of the Kibara …
Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa) S. Dewaele F. Henjes‐Kunst +7 authors B. Lehmann Geology
Sustainability | Free Full-Text | Potential Uses of …
Few investigations have focused on the potential uses of artisanal gold (Au) mine tailings, despite the fact that artisanal gold mining activity contributes to environmental issues such as greenhouse gas. …
Columbite SN3: A New Potential Reference Material for …
Coltan 139 and these three columbite-tantalite samples with variable compositions yielded internally consistent LA-ICP-MS U-Pb ages when using each other for calibration and the weighted mean 206 Pb/ 238 U ages are comparable to respective ID-TIMS ages. Composition-dependent U-Pb fractionation seems to be insignificant under …
U-Pb columbite age of Neoproterozoic Ta-Nb …
Tin granites and associated Ta-Nb pegmatites in the Kibaran belt of central Africa have been dated earlier only by highly scattered Rb-Sr data that were interpreted to reflect events at 1000 to 900 and 650 to 550 Ma. New U-Pb dating of columbite from the Kivuvu and Ruhembe pegmatites in Burundi precisely determines the age of the mineralization and …
Geological setting and timing of the cassiterite vein type
The Central African Mesoproterozoic Karagwe-Ankole belt in the Great Lakes area (DRCongo, Rwanda, Burundi, Uganda and Tanzania) forms a metallogenic province that hosts a variety of granite-related mineralization, which contains cassiterite, columbite-tantalite, wolframite/ferberite, spodumene and beryl.The Kalima area in the Maniema …
GEOCHEMISTRY AND SECONDARY ALTERATIONS OF …
Microlite and U-enriched microlite were found in eluvium close to highly weathered granitic pegmatites actively mined as a source of tantalum ore and situated within the ~1000–900 Ma old Kibara belt unit, Numbi mining area, South Kivu province of the Democratic Republic of the Congo. Two examined pegmatites differ in their mineral assemblages and in the …
Mineralogy of columbite-group minerals from the …
Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa) J. Afr. Earth …
Geology and mineralization of the Gatumba area, Rwanda …
The pegmatites are mineralised with columbite-tantalite and cassiterite. Recent investigation by Dewaele et al. (2007a Dewaele et al. (, 2008 indicates that the columbite-tantalite mineralisation ...
Petrographic and mineralogical characterisation of fractionated
Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa ravi chandra The Mesoproterozoic Kibara belt in Central Africa has recently been redefined and subdivided into the Karagwe–Ankole belt (KAB) and the Kibara belt (KIB), separated by Palaeoproterozoic ...
Neoproterozoic pre- and post-deformational …
Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa) J. African Earth Sci. ... These metasedimentary rocks have been overprinted by Pan-African deformation and greenschist facies metamorphism in the late Neoproterozoic (e.g., Van Daele et al., …
Petrogenesis and evolution of the Nuweibi rare-metal …
The Nuweibi rare-metal granite in the Central Eastern Desert of Egypt is highly evolved fine- to medium-grained leucogranite affected by pervasive albitization and greisenization. The intrusion holds an important tin–tantalum resource in the Egyptian Eastern Desert. Columbite–tantalite and cassiterite disseminations occur within the …
(PDF) Mineralogical characterization of cassiterite …
Cassiterite and columbite-tantalite mineralization can be found in the more evolved pegmatites, pegmatites of the LCT-type (Lithium Caesium Tantalum)-type according the paragenetic-geochemical classification scheme of Cerny (1991). ... & Lehmann, B., 2011. Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing ...
SHRIMP U-Pb dating of cassiterite: Insights into the
Secondary Ionisation Mass Spectrometry (SIMS) U-Th-Pb dating of cassiterite with very low to sub-ppm U contents, zircon and monazite has provided direct measurements of the ages of Mesoproterozoic–Neoproterozoic pegmatite and quartz vein Sn mineralisation in the Karagwe–Ankole Belt (KAB), Rwanda, and through dates on …
Late Neoproterozoic over of the cassiterite …
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Late Neoproterozoic over of the cassiterite …
VDOMDHTMLtml>. Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa) The …
Late Neoproterozoic over of the cassiterite and columbite
The pegmatites of the Gatumba area (western Rwanda) have historically been mined for their columbite-tantalite and cassiterite mineralisation, but contain also beryl, apatite, spodumene, amblygonite, and rare phosphates. Columbite-tantalite formed during the crystallisation of the pegmatites, followed by intense alkali metasomatism, i.e ...
Late Neoproterozoic over of the cassiterite …
The 40 Ar- 39 Ar spectra of muscovite samples associated with different steps in the paragenesis of the pegmatites show a spread of apparent ages between ∼940 Ma …
Geology of the cassiterite mineralisation in the Rutongo …
The Mesoproterozoic Kibara orogen in Central Africa hosts different granite-related rare element deposits that contain cassiterite, columbite-tantalite ( coltan ), wolframite, beryl, spodumene, etc. as typical minerals. The primary deposits of these minerals are formed by pegmatites and quartz veins that have historically been related to the youngest, most …
Geochemistry of feldspar and muscovite from pegmatite of …
Dewaele S, Henjes-Kunst F, Melcher F, Sitnikova M, Burgess R, Gerdes A, Fernandez MA, De Clercq F, Muchez P, Lehmann B (2011) Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa). J Afr Earth Sci 61:10–26. Article Google Scholar
Implications of UPb ages of columbite-tantalites from …
Semantic Scholar extracted view of "Implications of UPb ages of columbite-tantalites from granitic pegmatites for the Palaeoproterozoic accretion of 1.90–1.85 Ga magmatic arcs to the Baltic Shield" by R. Romer et al. ... Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the …
late neoproterozoic over of the cassiterite and …
what can we use columbite for. The U-Pb dating of columbite and monazite of the Mayo Salah leucogranite indicates a late-Neoproterozoic magmatic-hydrothermal mineralization event from 603.2 ± 5.3 to 581.6 ± 7.2 Ma, as consistent with both late D2 to D3 events that were recorded in the CAFB in Cameroon, and the associated continental collision …
Late Neoproterozoic over of the cassiterite and …
Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa) Journal Contribution - Journal …
Age of the Dahongliutan rare metal pegmatite deposit, West …
The similar columbite-(Fe) and cassiterite ages demonstrate that these minerals can be precisely dated and could provide useful alternatives to accurately constrain the timing and evolution of rare metal mineralization. ... Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the …
Late Neoproterozoic over of the cassiterite …
Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa) August …
In situ U–Pb isotopic dating of columbite–tantalite by …
Columbite–tantalite (Coltan) is the most important niobium (Nb)- and tantalum (Ta)-bearing economic mineral, commonly occurring in rare metal granite and pegmatite, alkaline granite, syenite and carbonatite. ... Late Neoproterozoic over of the cassiterite and columbite–tantalite bearing pegmatites of the Gatumba area, …
Late Neoproterozoic over of the cassiterite …
Dewaele S, Henjes-Kunst F, Melcher F, Sitnikova M, Burgess R, Gerdes A et al. Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing …
Sci-Hub | Late Neoproterozoic over of the cassiterite …
Dewaele, S., Henjes-Kunst, F., Melcher, F., Sitnikova, M., Burgess, R., Gerdes, A., … Lehmann, B. (2011). Late Neoproterozoic over of the cassiterite and ...
Nb‐Ta‐Sn‐W Distribution in Granite‐related Ore Systems
Tantalum, niobium, tin, and tungsten mineralization typically occurs worldwide in close proximity to fractionated peraluminous leucogranites. These granite-related ore deposits show a diversity of mineralization modes, ranging from plutonic-hosted breccia and hydrothermal vein-stockwork systems to (peri)batholitic greisens, skarns, …
A review of origins and occurrences of Niobium-Tantalum, Tin …
Geology of the cassiterite mineralisation in the Rutongo area, Rwanda (Central Africa): Current state of knowledge. Geol. Belgica. 13, 91-112 Dewaele, S., et al., 2011. Late Neoproterozoic over of the cassiterite and columbite-tantalite bearing pegmatites of the Gatumba area, Rwanda (Central Africa). J. Afr. Earth.
(PDF) Columbite-tantalite and cassiterite as indicator …
The chemical and textural features of columbite-tantalite and cassiterite in the Leinster albite-spodumene pegmatites are seen in similar rare element pegmatites and rare metal granites elsewhere ...