摘要
大桥坞矿床是赣杭构造-火山岩带中典型火山岩型铀矿床之一,文章旨在研究大桥坞矿床硫同位素特征及其物源示踪意义。研究表明,大桥坞矿床铀矿石δ34 SV-CDT值介于-2.18‰～-10.43‰,蚀变围岩中的δ34SV-CDT值介于6.67‰～8.63‰,两者硫同位素组成存在明显的差异。分析认为,造成铀矿石的δ34SV-CDT值一致为负,而蚀变围岩的δ34SV-CDT值一致为正的原因,可能是成矿流体本身产生的沸腾去气作用导致硫同位素分馏效应;大桥坞矿床成矿流体中的硫具有幔源属性。
Daqiaowu deposit is one of the typical volcanic-type uranium deposits in Ganhang tectonic-vol- canic belt, sulfur isotope features of the deposit and its tracing significance was discussed in this paper. Research shows that the values of 834 SVCDT from ores ranges from -2. 18‰ to -10.43‰, and the values of δ^34-CDT from altered wall rock ranges from 6.67‰ to 8.63‰. Remarkable difference of sulfur isotope composition occurs between ore and wall rock. It is considered that the negative values of δ^34-CDTin ura- nium-ores and relatively positive in wall rock might caused by the sulfur isotopic fractionation during boil- ing-degassing of the ore-forming fluids. The sulfur source of Daqiaowu uranium ore-deposit is derived from mantle.
出处
《铀矿地质》
CAS
CSCD
2012年第2期90-94,123,共6页
Uranium Geology
基金
国家自然科学基金(编号:41040019)
东华理工大学核资源与环境教育部重点实验室开放基金资助项目
关键词
硫同位素
火山岩型铀矿
成矿流体示踪
大桥坞矿床
sulfur isotope
volcanic-typed deposit
Daqiaowu uranium ore-deposit
northwestern Zheiiang province
