摘要
通过望儿山断裂带构造控矿规律总结和成矿构造演化分析,建立区域构造成矿模式。望儿山断裂带构造控矿规律为:矿床在断裂带走向上呈似等间距分布;断裂带的上下盘均可成矿,矿体在断裂带中分布具有多层性;断裂带倾斜延深度大,控制矿体深度亦大;矿床在剖面上均呈"S"型产出,显示断裂成矿期具正向滑移性质;断裂带上各矿床矿体普遍向南西侧伏;矿体在延深方向上具分段富集规律。断裂带构造演化经历了成矿前NWW向挤压,成矿期NWW向拉伸,成矿后NNW挤压三个阶段。区域构造成矿模式可以概括为:成矿期区域NWW向的拉伸和岩浆-流体成矿系统的热驱动力联合作用,使早期NE向压扭性断裂张开,含金热液在断裂带引张的泵吸作用下沿断裂带呈脉动式上升,在断裂带不同的构造环境中分别形成蚀变岩型金矿和石英脉型金矿。在上述工作的基础上,提出断裂带下一步找矿方向。
The ore-forming model of the regional structure has been established by summarizing structural ore-controlling regularities of Wangershan fault and analyzing metallotectonic evolution.The regularities in Wangershan fault are as followings: The distribution of deposit is isometric in the trend of the fault.The orebodies have multi-layer controlled by the main fault plane,the hanging wall and footwall.The orebodies have great extension and are controlled by the extension of the fault in dip and depth.The form of orebody shows S-type in the profile and there is positive slip in the fault belt in the mineralization period.The orebodies have obvious regularity of lateral trending of SW in the longitudinal profile.The mineralization has obviously sub-enrichment regularity.The tectonic evolution of fault belt experienced NWW-compression before mineralization,NWW-tension in mineralization period,and NNW-compression after mineralization.The regional structural ore-forming model is summarized as that the early NE compression and scissor fault opening because of the coupling of the regional stretching force of NWW and driving force of thermal magma-fluid system,the gold-bearing hydrothermal rising in pulse in the pump-absorb action of the fault belt,and the altered rock type gold deposits and quartz vein type gold deposit were formed in different tectonic environments.Base on above analysis,the new prospecting direction have been proposed.
出处
《矿产与地质》
2011年第3期177-184,共8页
Mineral Resources and Geology
基金
山东黄金矿业股份有限公司焦家金矿项目
中国科学院地球化学研究所矿床地球化学国家重点实验室开放基金(200913)
有色及贵金属隐伏矿床勘查教育部工程研究中心和广西地质工程中心重点实验室主任基金项目(桂科能0710911-Z007)资助
关键词
金矿床
成矿构造
构造控矿规律
找矿方向
望儿山断裂
胶东
Gold
Ore-forming structure
Structural ore-controlling regularity
Prospecting direction
Wangershan fault
Jiaodong
