辽宁岫岩中沟地区不整合关联型铀矿地质特征及成因探讨
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摘要
辽宁岫岩中沟地区位于华北克拉通北缘东段,辽吉古元古代裂谷带的南段,处于营口-凤城-长甸铀矿构造成矿亚带内.中沟地区古生界挫草沟组与古元古界里尔峪组间古风化壳发育,铀矿化分布于古生界与古元古界不整合接触面附近,与切割不整合面的断裂构造关系密切.矿化与黏土化、硅化等低温热液蚀变关系密切.古风化壳及其附近岩石含U较高,特征元素组合相关性较好,发现有高品位的铀及多金属矿体存在.其主要成矿期有:不整合面发育期、主要造陆期及断块运动期.在初步总结分析中沟地区铀矿地质特征的基础上,认为中沟地区具有形成不整合关联型铀及多金属矿良好的成矿条件和找矿前景.
The Zhonggou area in Xiuyan County of Liaoning Province is located in the south of Liaoning-Jilin Paleoproterozoic rift zone,east of the northern margin of North China Craton,and in the Yingkou-Fengcheng-Changdian uranium metallogenic subzone. The paleo-weathering crust between the Paleozoic Cuocaogou Formation and Paleoproterozoic Lieryu Formation is developed with the uranium mineralization distributed near the unconformity interface,which bears a close relation to the fault structures that cut the unconformable surface. The mineralization is closely related to epithermal alterations such as clayization and silicification. The paleo-weathering crust and nearby rocks are rich in U with good correlation of characteristic element association,where high grade uranium and polymetallic orebodies are found. The main metallogenic period include development of unconformable surface,major epeirogenic stage,and fault-block movement stage. Based on the preliminary analysis of the geological characteristics of uranium deposits in Zhonggou area,it is thought that the area has good metallogenic conditions and prospecting potential for unconformity-related uranium and polymetallic deposits.
The Zhonggou area in Xiuyan County of Liaoning Province is located in the south of Liaoning-Jilin Paleoproterozoic rift zone,east of the northern margin of North China Craton,and in the Yingkou-Fengcheng-Changdian uranium metallogenic subzone. The paleo-weathering crust between the Paleozoic Cuocaogou Formation and Paleoproterozoic Lieryu Formation is developed with the uranium mineralization distributed near the unconformity interface,which bears a close relation to the fault structures that cut the unconformable surface. The mineralization is closely related to epithermal alterations such as clayization and silicification. The paleo-weathering crust and nearby rocks are rich in U with good correlation of characteristic element association,where high grade uranium and polymetallic orebodies are found. The main metallogenic period include development of unconformable surface,major epeirogenic stage,and fault-block movement stage. Based on the preliminary analysis of the geological characteristics of uranium deposits in Zhonggou area,it is thought that the area has good metallogenic conditions and prospecting potential for unconformity-related uranium and polymetallic deposits.
引文
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[3]吉才,丛卫克.不整合面型铀矿床的多阶段形成过程[J].世界核地质科学,2009,26(3):153-156.
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(2)董春林,等.辽东半岛地区中日共同研究报告,1993.
(1)李宏宇.辽宁省庄河市步云山-岫岩县老虎山地区铀矿资源调查评价2016年年报.