同位素2017，Vol.30Issue(4)：225-231,7.DOI:10.7538/tws.2016.youxian.050
粤北棉花坑铀矿床深部矿体矿化剂CO2来源探讨
Discuss on Origin of Mineralizer CO2 from the Deep Seated Orebodies of Mianhuakeng Uranium Deposit in Northern Guangdong ,China
摘要
Abstract
The Mianhuakeng uranium deposit is a large granite-type uranium deposit in Southern China .The carbonatization is closely correlated with the uranium mineraliza-tion in this deposit .The calcite of different stages of deep seated orebodies in the Mian-huakeng uranium deposit were sampled and the carbon and oxygen isotopes were investi-gated .The calcite veins in the Mianhuakeng uranium deposit were divided into three stages ,namely pre-mineralization stage , the principal mineralization stage and post-mineralization stage .The values of δ13 CPDB of calcites decreased from the pre-mineraliza-tion to the principal mineralization to the post-mineralization stages . The value ofδ18 OSMOW was the smallest in the pre-mineralization stage ,and was similar with the aver-age value in the principal and post-mineralization stages . The δ13 CPDB of calcites was from -4.9‰ to -6.0‰ with -5.5‰ in average in the pre-mineralization stage ,which were consistent with CO2 in the mantle .The δ13CPDB decreased in the principal minerali-zation stage and post-mineralization stage ,because of the isotope fractionation during the degassing of CO2 ,indicating that the carbon of ore-forming fluid of Mianhuakeng uranium deposits was mainly from mantle .Theδ13CPDB performed the negative correla-tion with the δ18 OSMOW ,suggesting that the mineralizer in ore-forming fluids of Mian-huakeng uranium deposit was formed by the mantle degassing .关键词
碳同位素组成/氧同位素组成/矿化剂/深部矿体/棉花坑铀矿床Key words
carbon isotopic composition/oxygen isotopic composition/mineralizer/deep seated orebodies/Mianhuakeng uranium deposit分类
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潘春蓉,杨海林,潘家永..粤北棉花坑铀矿床深部矿体矿化剂CO2来源探讨[J].同位素,2017,30(4):225-231,7.基金项目
国家自然科学基金项目(U1403292) （U1403292）
