摘要
郯庐断裂带南段的皖东北地区地质构造复杂,多为厚覆盖区,找矿难度大。由于控矿条件难以调查清楚,缺乏具有区域特色的勘查理论指导,区内金矿勘查长期没有取得突破成果。笔者依托五河金矿整装勘查项目,进行了区域重磁异常特征和成矿规律分析研究,发现皖东北地区北东-北北东向重力低异常具有弧形条带特征,并以郯庐断裂带为界,大致具有旋转对称性。重磁异常保存印支期构造格架痕迹信息,反映了郯庐断裂带南段时空演化特征,显示了北东-北北东向主要断裂构造具有继承性,形成于印支期,燕山期继续活动,控制白垩纪"红层盆地"和燕山期成岩成矿作用。中低温热液型金多金属矿床和矽卡岩型铜金矿床是皖东北地区主要矿床类型,均受继承性断裂构造控制。结合郯庐断裂的演化特征,利用物探成果引领地质理论创新,提出了郯庐断裂带南段矿床的"继承性断裂构造控矿模式"。根据继承性断裂构造形成机理分析其空间分布规律,总结了矿化蚀变构造带的物探异常标志,解决了皖东北覆盖区成矿预测与找矿靶区圈定难题,在五河金矿整装勘查区应用取得了重要找矿成果,圈定6个金矿找矿靶区,得到了钻探验证,已发现中型规模金矿床2处、小型3处,估算潜在资源量可达特大型规模,实现了安徽省境内郯庐断裂带金矿找矿的重大突破。
The geological structure of the northeastern Anhui in the southern part of the Tan Lu fault zone is complex.Identifying the location of ore deposits is a challenge in this thickly covered area.For this reason,and the lack of theoretical guidance based on regional characteristics,there has been no breakthrough in the exploration of gold ores in this region for a long time.Under the aegis of the Wuhe gold mine package exploration project,the author has carried out the research and analysis on the characteristics of gravity and magnetic anomalies and metallogenic law in the northeast of Anhui Province which has resulted in the discovery of the NE-NNE gravity low anomaly in this region.It has the characteristics of arc-shaped belt,and is roughly rotationally symmetric with the Tan Lu fault zone as the boundary.There are traces of Indosinian tectonic framework preserved in the gravity and magnetic anomalies.These reflect the temporal and spatial characteristics of the southern section of the Tan Lu fault zone.This indicates that the main faults in NE to NNE direction were inherited.It was formed in Indosinian and continued to be active in Yanshanian,controlling the diagenesis and mineralization of Cretaceous"red bed basin"and Yanshanian.The middle and low temperature hydrothermal type gold polymetallic deposit and skarn type copper gold deposit,controlled by inherited fault structures,are the main deposit types in the northeast of Anhui Province.These results,together with the evolution characteristics of the Tan Lu fault,promoted the innovation of geological theory by using the results of geophysical exploration,and proposed the"inherited fault structural ore control mode"of the deposit in the south section of the Tan Lu fault zone.This research solved the problem of delimiting the target area in the integrated exploration of Wuhe gold mine,and achieved important ore prospecting results.Six gold prospecting targets have been delineated in the east of the Wuhe County and verified by drilling.Two medium-sized gold depo
作者
汪青松
张顺林
张金会
张家嘉
尤淼
WANG Qingsong;ZHANG Shunlin;ZHANG Jinhui;ZHANG Jiajia;YOU Miao(Technoloty Innovation Center of Coverage Area Deep Resource Explration Engineering,MNR,Hebei,230001;Geological Exploration Technology Institute of Anhui Province,Hefei,230031)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2020年第10期2965-2977,共13页
Acta Geologica Sinica
基金
安徽省地勘基金项目“安徽省五河县荣渡-小溪集金及多金属矿整装勘查”(编号2010-34、2011-1-28、2013-3-9、2015-2-9)资助成果。
关键词
郯庐断裂带
皖东北
金矿
控矿模式
应用
Tan-Lu fault zone
northeastern Anhui
gold deposit
ore control mode
application
