| Reference Type | Journal (article/letter/editorial) |
|---|
| Title | The chemical composition of uraninite in Variscan granites of the Erzgebirge, Germany |
|---|
| Journal | Mineralogical Magazine | ISSN | 0026-461X |
|---|
| Authors | Förster, H.-J. | Author |
|---|
| Year | 1999 (April) | Volume | 63 |
|---|
| Issue | 2 |
|---|
| Publisher | Mineralogical Society |
|---|
| Download URL | https://rruff.info/doclib/MinMag/Volume_63/63-2-239.pdf+ |
|---|
| DOI | doi:10.1180/002646199548466Search in ResearchGate |
|---|
| Generate Citation Formats |
|---|
| Mindat Ref. ID | 1277 | Long-form Identifier | mindat:1:5:1277:9 |
|---|
|
| GUID | 0 |
|---|
| Full Reference | Förster, H.-J. (1999) The chemical composition of uraninite in Variscan granites of the Erzgebirge, Germany. Mineralogical Magazine, 63 (2) 239-252 doi:10.1180/002646199548466 |
|---|
| Plain Text | Förster, H.-J. (1999) The chemical composition of uraninite in Variscan granites of the Erzgebirge, Germany. Mineralogical Magazine, 63 (2) 239-252 doi:10.1180/002646199548466 |
|---|
| In | (1999) Mineralogical Magazine Vol. 63 (2) Mineralogical Society |
|---|
| Abstract/Notes | AbstractUraninite is widespread as an accessory mineral in the Erzgebirge granites. It occurs throughout the entire comagmatic series of strongly peraluminous S-type Li-mica granites and has been discovered in more evolved transitional I-S type biotite and two-mica granites, but is rare in those of A-type affinity. Textural relationships and chemical ages imply that uraninite is of magmatic origin. Its composition is variable with a proportion of U plus radiogenic Pb between 71 and 99 mol.%. Uraninite has incorporated Th, Y, and the REE in total amounts between 1 and 29 mol.%. Elements such as P, Si, Al, Ca, and Fe are subordinate. Uraninite from two-mica and Li-mica granites is low in ThO2 (0.8–6.5 wt.%), Y2O3 (0–0.8 wt.%) and REE2O3 (0.1–0.6 wt.%). In contrast, biotite granites from the Kirchberg pluton contain uraninite which is enriched in these components (in wt.%) (ThO2 = 5.6–11.0, Y2O3 = 0.6–5.5, Ce2O3 = 0.1–0.6, Dy2O3 = 0.2–1.1). Commonly, the lanthanide and actinide contents in uraninite correlate poorly with those in the host granite. In S-type Li-mica granites as well as fractionated two-mica and biotite granites, uraninite is the dominant contributor to the bulk-rock U content. Here the proportion of U approaches 80–90%. |
|---|
These are possibly similar items as determined by title/reference text matching only.
