Yerila gneissic complex, Mt Babbage area (Inlier), North Flinders Ranges, Flinders Ranges, South Australia, Australia
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The Yerila gneiss (1555 Ma) is generally showing large laths of oriented microcline, large allanite patches, biotite, oligoclase and contains alkaline amphiboles. The rock has a metasomatic origin and represents the high-level plume of the nearby rapakivi Terrapinna Granite (1560 Ma). The pre-metasomatic rock was of volcanic (rhyolites, tuffs, etc.) and of sedimentary origin (sandstones, carbonates). The rock is extremely rich in rare earth elements (up to a few percents), uranium, thorium and fluorine.
The complex is crosscut by amphibolite dikes (~800 Ma) and intruded by a 3 x 6 km Palaeozoic tonalite and numerous granitic pegmatites.
24 entries listed. 22 valid minerals.
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