Proposed Title 1: - Queen's University

The uranium deposits in various provinces shown in Fig. 5.4 have been interpreted as
epigenetic in origin with fluid probably originated from the Archean granitoids and
associated Paleoproterozoic rocks (Äikä and Sarikkola, 1987). The U mineralization occurs
as: (1) lenses and disseminations in the quartz-pebble conglomerate in quartzite and
arkosite members, (2) near the contact between the Jatulian diabase dikes and the basal
conglomerate where they cut the uraniferous quartzite-conglomerate horizon, and (3) at the
unconformity between the Sariolian basement rocks and the basal conglomerate of the
lower Jatulian unit (Fig.5.5).
Recent geochronological studies suggest that the age of the Jatulian U mineralization
is close to ca. 2273 Ma (K. Kyser, pers. Comm.2012) with extensive late alteration related
to subsequent tectonic events such as the dominant 1.95-1.82 Ga Svecofennian Orogen
(Pharaoh and Brewer, 1990). The age of the U mineralization in this successor basin is
therefore older than the overlying late Mesoproterozoic Satakunta sandstones deposited at
1.4-1.3 Ma (Fig. 5.4). Aikas and Sarikkola (1987) suggested that mineralogical and
geochemical evidence indicate multistage epigenetic U mineralization in these deposits.
Äikä and Sarikkola (1987) and Saltikoff et al (2006) suggested some similarities with
known economically important, unconformity, vein, breccia, and sandstone deposit styles.
The styles of U mineralization spatially associated with Jatulian successor basins in
the Koli area, the occurrence of U at the basal Jatulian unconformity, the close association
between the U mineralization and the 2.1–1.97 Ma mafic dikes, and U occurrences as
disseminations in metamorphosed conglomerate of the Jatulian quartzite and arkosite
members (Fig. 5.5), suggest many similarities between these deposits and U deposits
204