Cassiterites showed U values of 0-6 p.p.m., with the higher amounts corresponding with the darker-colour bands. Sulphides contained no detectable U by fission-track methods, the high concentrations being related to micro-veining. Wolframite showed a wide range of U (0.4-22 p.p.m.) with sharp zonation and several generations of U deposition within one crystal; the U was not, however, associated with either the Fe- or the Mn-rich phases.R.A.H.
|Original language||English (US)|
|Number of pages||5|
|State||Published - Jan 1 1982|
ASJC Scopus subject areas
- Geochemistry and Petrology