摘要
赣杭带东段天姆尖地区首次识别出大面积分布的碎斑熔岩体系 ,它具有典型的喷溢相—侵出相—次火山岩相“三相一体”特征 ,在岩石化学成份上表现为富硅、碱、铁而贫镁、锰、钙 ,岩石结晶分异指数为 77～ 93,稀土元素铕亏损明显 ,放射性成因铀铅含量高 ,岩石蚀变表现为面式分布 ,具前锋带特点。这一发现对赣杭带寻找新的富大铀矿远景区有着重要的指示意义。
A large area of porphyroclastic lava at Tianmujian caldera in Ganhang belt was identified for the first time. The lava has typical characteristic of 'three facies around one caldera', and is chemically rich in Si, alkali, Fe and dilution in Mg, Mn, and Ca. The lava has also high differentiation index and lead decayed from uranium. The REE pattern has remarkable depletion of Eu. The rock alteration is widely planar distribution and has the characteristic of the margin zone. This discovery has significance for the future uranium prospecting.
出处
《地质与勘探》
CAS
CSCD
北大核心
2002年第2期55-58,共4页
Geology and Exploration
