浙江衢州大洲火山断陷盆地构造应力场特征及其与铀成矿关系

Tectonic Stress Field's Characteristic and Its Relationship of Uranium Mineralization at Dazhou Volcanic Faulted Basin in Quzhou, Zhejiang Province

在构造变形研究的基础上,通过野外露头共轭剪节理的产状测量,采用数学统计方法进行分期配套,并结合前人的研究成果,开展了大洲火山断陷盆地古构造应力场及其与铀成矿关系的研究。总结了主要经历的四期构造应力:前晚侏罗世构造期、磨石山期、衢江期、始新世—渐新世构造期,分别讨论了各个期次对铀成矿的控制作用,指出后三个构造期与铀成矿关系密切,即磨石山期构造应力场为成矿准备了储矿空间,衢江期构造应力场为成矿准备了导矿空间,而始新世—渐新世构造期构造应力场对已形成矿体进行了破坏或改造。

Based on the study of the structural deformation, the occurrence measurement of outcropped conjugate shear joints, and previous research results, the paleo-tectonic stress field of the Dazhou volcanic faulting basin and its relationship to uranium mineralization was studied using mathematical statistics. Four stages of tectonic stress undergone are summarized： pre-Late Jurassic tectonic stage, Moshishan stage, Qujiang stage, and Eocene-Oligocene tectonic stage. And controlling of each stage over uranium mineralization is also discussed. Finally, this study suggests that late three tectonic stages have close relation to the uranium mineralization, i.e. the Moshishan tectonic stress field provided space for mineralization, the Qujiang stage provided conduits, and Eocene-Oligocene tectonic stress destroyed or reformed previously-formed orebodies.