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plasma mass spectrometry (LA-HR-ICP-MS; Chipley et al., 2007) yielded 207 Pb/ 206 Pb dates
between 1855 Ma and 820 Ma at the El Sherana deposit and between 964 Ma and 634 Ma
at the Palette deposit (Chipley et al., 2007). Uraninite from the Adelaide River deposit
gives 207 Pb/ 206 Pb ages ranging between 1069 Ma and 735 Ma (Chipley et al., 2007). Ages
for the unconformity-related U deposits in the overlying Kombolgie Basin are 1675 to 1650
Ma (Polito et al., 2004; 2005).
4.3. Characteristics of selected uranium deposits
4.3.1. Coronation Hill uranium deposit
The oldest rocks in the Coronation Hill deposit area consist of interbedded
ferruginous slate, carbonate and quartzite of the Koolpin Formation and green
volcanoclastic sedimentary rocks (Fig. 4.2; Wyborn et al., 1991). Quartz-feldspar porphyry
and mafic intrusive rocks are correlated with the Gerowie Tuff (Carville et al., 1991) and
the Zamu Dolerite (Warren and Kamprad, 1990), respectively. The mafic intrusive rocks
consist of quartz diorite and minor granophyre, which are overlain by a sedimentary breccia
that is part of the Coronation sandstone (Mernagh et al. 1994). All of these rocks are
uncomformably overlain by a quartz sandstone unit of the Kombolgie Formation (Fig. 4.2,
Carville et al., 1991).
Valenta (1991) described three events of faulting. East-striking normal faults separate
quartz-feldspar porphyry and conglomerate and are overprinted by a north-striking dip-slip
fault that separates conglomerate and green volcanoclastic sedimentary rocks. North
northwest-striking, subvertical, strike-slip shear zones offset earlier faults and control the
mineralization (Mernagh and Wyborn, 1994; Eupene, 2003).
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