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Origin of zircon-ilmenite placers of West Siberia |
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| Abstract: | Zircon-ilmenite placers in thin sandy clays of the West Siberian lowlands have been assigned ages ranging from Upper Cretaceous to Middle Oligocene. The productive beds were formed under continental conditions close to a Paleozoic sandstone source ridge. Inherited mineral composition, grain size and identical ore minerals are lines of evidence used to relate the placers to their source beds.—W. E. Yasso |
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