期刊论文

Geochronology and geochemistry of the Zhangjia granitic pluton in the Miaoershan uranium orefield. Northeastern Guangxi Province

Fan, H.

中文

地质通报

1671-2552

2018

37

5

895-907

10.3969/j.issn.1671-2552.2018.05.012

中核集团项目《南方重点花岗岩型铀矿基地资源预测和扩大》 中国地质调查局项目《整装勘查区找矿预测与技术应用示范》（编号：12120114052401）

本校为其他机构

对张家岩体乍古田矿床及张家矿床的2件赋矿围岩样品,开展LA-ICP-MS锆石U-Pb同位素定年,获得乍古田矿床赋矿围岩形成年龄为218.0±1.4Ma,张家矿床赋矿围岩形成年龄为226.8±5.7Ma。另外,对张家岩体8件样品的主量、微量元素及Sr-Nd同位素分析测试显示,张家花岗岩富硅(SiO_2=74.35%~76.29%)、高铝(Al_2O_3=12.54%~14.03%)、高碱(Na20+K20=6.95%~9.17%)、低镁(MgO=0.34%~0.45%)、低钙(CaO=0.68%~1.03%)、低钛(TiO_2=0.106%~0.18%),属高钾钙碱性花岗岩;富集Rb,亏损Ba、Sr,Rb/Sr值高,属于低Ba-Sr花岗岩;轻稀土元素富集,负Eu异常;富U(平均21.5×l0~(-6)),Th/U值低(平均1.63),有利于铀矿化;(~(87)Sr/~(8...

Two samples were collected near the Zhagutian uranium ore deposit and Zhangjia uranium ore deposit respectively to carry out LA-ICP-MS zircon U-Pb isotopic dating. The analytical result demonstrates that the formation age of the host rock in the Zhagutian uranium ore district is 218.0±1.4Ma, whereas the formation age of the host rock in the Zhangjia uranium ore district is 226.8±5.7Ma. Furthermore, the Zhangjia granite is characterized by high SiO2 (74.35%~76.29%), Al2O3 (12.54%~14.03%) and (Na2O+K2O) (6.95%~9.17%), but low MgO (0.34%~0.45%),...