辽东五龙与青城子矿集区成矿和保存条件对比及其深部找矿意义  

Comparison of mineralization and preservation conditions in the Wulong and Qingchengzi ore concentration areas,eastern Liaoning Province:implications for deep metallogenic prediction

作　　者：张拴宏[1,2] 张琪琪 胡国辉 李建锋[1,2] 肖昌浩 刘向冲[1,2] 王森 ZHANG Shuanhong;ZHANG Qiqi;HU Guohui;LI Jianfen;XIAO Changhao;LIU Xiangchong;WANG Sen(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Key Laboratory of Paleumagnetism and Tectonic Reconstruction Ministry of Natural Resources,Beijing 100081,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]自然资源部古地磁与古构造重建重点实验室,北京100081

出　　处：《地质学报》2022年第1期232-248,共17页Acta Geologica Sinica

基　　金：国家重点研发计划课题(编号2018YFC0603802);国家自然科学基金项目(编号41725011)联合资助的成果。

摘　　要：位于辽东地区的青城子与五龙矿集区尽管成矿大地构造背景相似,但其成矿时代、赋矿围岩及控矿构造却有明显的差别。根据对青城子矿集区金-多金属矿床及五龙矿集区五龙金矿床和四道沟金矿床成矿大地构造背景、赋矿围岩、岩浆活动时代及产状、控矿及容矿构造、成矿时代和剥蚀程度新数据及已有资料的综合分析,认为青城子矿集区金-多金属矿床及五龙矿集区五龙金矿床和四道沟金矿床的成矿差异主要与晚三叠世以来剥蚀程度不同有关,在此基础上提出了辽东地区"三层楼"成矿找矿模式。该"三层楼"模式底部为赋存于中侏罗世深成变形花岗岩体内陡倾断裂带中的"五龙式"石英脉型金矿床(早白垩世成矿),中部为赋存于辽河群下部变质碎屑岩内层间断裂带中的"四道沟式"蚀变岩型及石英脉型金矿床(早白垩世成矿),而上部为赋存于盖县组碎屑岩及大石桥组大理岩硅-钙面附近层间断裂带(部分为切层断裂带)的"白云式"石英脉型及蚀变岩型金-多金属矿床(三叠纪成矿为主,但有晚侏罗世及早白垩世成矿的叠加)。未来辽东深部找矿中要注意青城子金-多金属矿集区深部存在"四道沟式"及"五龙式"金矿床的可能,以及在五龙矿集区四道沟金矿深部存在"五龙式"金矿床的可能性。特别是在剥蚀程度相对较浅的青城子矿集区可能存在有较好的深部找矿潜力,在未来研究工作中需要加以重视。Although the Qingchengzi and Wulong ore concentration areas in the eastern Liaoning Province are characterized by a similar tectonic background, their mineralization ages, ore-hosting rocks and ore-controlling structures are very different. Previous researches and our new data on tectonic background, ore-hosting rocks, magmatism ages and occurrences, ore-controlling structures, mineralization ages and erosion depth of the gold and Pb-Zn-Ag polymetallic deposits in the Qingchengzi ore concentration area and the Wulong and Sidaogou gold deposits in the Wulong ore concentration area suggest that the differences between mineralization in these two ore concentration areas are most likely related to differential uplift and erosion from the late Triassic period.Therefore, we propose a “three-floor metallogenic model” for the gold-polymetallic deposits in the eastern Liaoning Province. In this metallogenic model, the early Cretaceous “Wulong type” gold-bearing quartz vein deposit within the middle Jurassic deformed granitic pluton is located in the lower part, and the early Cretaceous “Sidaogou type” structural alteration type and quartz vein type gold deposit within the Paleoproterozoic metaclastic sedimentary rocks from the lower Liaohe Group is located in the middle part. The upper part of the metallogenic model is the “Baiyun type” quartz vein-bearing and structural alteration type gold or Pb-Zn-Ag polymetallic deposit near the contacts between the Paleoproterozoic metaclastic rocks of the Gaixian Formation and marbles of the Dashiqiao Formation of the upper Liaohe Group.These gold-polymetallic deposits were mainly formed in the Triassic period with middle Jurassic and early Cretaceous mineralization overprints. It is most likely that some “Wulong type” and “Sidaogou type” ore deposits exist beneath the currently explored ore bodies in the Qingchengzi ore concentration area, and some “Wulong type” gold-bearing quartz vein deposits may exist beneath the currently explored ore bodies in the

关 键 词：五龙矿集区 青城子矿集区 深部找矿预测 差异抬升剥蚀 辽东 

分 类 号：P618.51[天文地球—矿床学]