New discovery of uranium ore spot and prospecting discussion in north western Dayawan, Guangdong province.
广东大亚湾西北部新发现铀矿点及找矿远景讨论

A volcanic rock-type uranium ore-spot was discovered with airborne gama-ray spectrometry in north-western Dayawan, Guangdong Province in 2003.The ore grade of mineralization zone is up to 0.459% in ditch sampling analyses.Uranium minerals of the ores are uraninite and altering uranium minerals.The Uraninite has high UO_2 (maximum about 94%),low Al_2O_3(<1%) and variable P_2O_5 contents.Two groups can be subdivided according to P_2O_5 contents,one ranges between 2.23% and 2.57% ,another between 17.96% and 19.95%.The altering uranium minerals contain UO_3 about 60%,1.6% to 3.0% in Al_2O_3 and 10% to 15% in P_2O_5.Ores-host rocks for ore spot have the characteristics as follows,they are mainly rhyolites and in the TAS diagram,similar to those in"Xiangshan Uranium Ore Field".Whole rocks composition between ores and wall rocks in this area does not show great distinction.The ores and wall rocks in ore spot have similar REE and traces elements,essentially the characteristics of geochemistry similar to those of calc-alkaline volcanic rocks.They have higher LREE/HREE ratios and slightly negative Eu anomalies.Although the scale of the uranium mineralization zone is not larger enough,the content of uranium ores is higher.Moreover,the tectonic background is similar to some deposits in"Xiangshan Uranium Ore Field".Thus,the discovery of uranium prospective area is significant for further exploration and research.