Mineralogy of Thoriferous Bitumen Nodules, Northwest Irish Basin
Thoriferous bitumen nodules in the Northwest Irish Basin are composed of an envelope of bitumen surrounding numerous inclusions of a range of thorium-calcium phospho-silicates. One nodule exhibits physical and chemical zonation, indicating episodic influx of mineralizing fluids with changing chemistry through time. Calculated chemical ages for the inclusions show a wide range of results indicating that Pb was present at the time of nodule formation and has undergone leaching subsequent to this.
KeywordsLower Cambrian Vitrinite Reflectance Shrinkage Crack Petroleum Migration Solid Bitumen
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