辽西地区温杖子金矿床地质特征与成矿系统
本文选题:温杖子金矿床 + 地质特征 ; 参考:《吉林大学》2015年硕士论文
【摘要】:本文以产于华北陆块北缘并叠加了中生代构造-岩浆带的辽西温杖子金矿床为主要研究对象,研究总结构造破碎带内的脉状金矿床地质特征,分析归纳了其成矿要素和成矿系统,为该区及其相似地区开展找矿预测提供了借鉴。 通过系统总结研究矿床地质特征并结合区域成矿地质背景,进一步明确了温杖子金矿床产出地质环境和矿床属性。温杖子金矿床处于前中生代华北陆块东段中生代建昌盆地南缘,总体上为受近东西向压扭性断裂破碎带控制的脉状蚀变岩型金矿床。矿床产出围岩为中生代安山质火山-沉积岩含金建造和花岗闪长岩侵入岩含金建造。 系统研究总结了温杖子金矿床地质特征。矿体总体表现为沿近东西向断裂破碎带产出,沿走向、倾向延伸大,但矿化极不均匀,单个矿体规模不大,,尖灭再现明显。在水平方向上,矿化强度由东向西增强,矿化元素也由金银为主变为金银铜铅锌共存;在垂直方向上,勘查结果和以往开采区位置显示出有2个矿化富集带,上部以往开采区围绕800m标高上下、550~700m标高为2个矿化富集地段。矿石质量较好,为易选矿石。 总结归纳出温杖子金矿床成矿要素。温杖子矿床矿化的主控因素为中生代含金建造、燕山早期岩浆岩系统和韧-脆性断裂系统。野外观察获得的地质资料及与成矿相关的测年结果都表明矿化主要形成在燕山期。 在上述研究基础上,提出了温杖子金矿床成矿系统。笔者认为温杖子金矿床的成矿系统模型为“中生代岩浆岩含金建造-热流体交代成矿物质聚集-构造定位定型”。按照这种成矿系统认识,区内韧-脆性断裂发育地段应当是继续找矿的重要区域,矿化类型应当以蚀变岩型为主。
[Abstract]:Taking the Wenzangzi gold deposit, which occurred in the northern margin of the North China continental block and superimposed the Mesozoic tectonic-magmatic belt, as the main object of study, the geological characteristics of the vein gold deposit in the tectonic fracture zone are studied and summarized in this paper. The ore-forming elements and ore-forming system are analyzed and summarized, which provides a reference for ore prospecting and prediction in this area and its similar areas. By systematically summarizing the geological characteristics of the deposit and combining with the regional metallogenic geological background, the occurrence geological environment and the deposit attributes of the Wenzangzi gold deposit are further clarified. The Wenzhang gold deposit is located in the southern margin of the Mesozoic Jianchang basin in the eastern segment of the North China block in the pre-Mesozoic, and is generally a vein altered rock type gold deposit controlled by the near east-west compression-torsional fracture zone. The host rock of the deposit is the gold bearing formation of Mesozoic Anshan volcanic sedimentary rock and granodiorite intrusive rock. The geological characteristics of Wenzhang gold deposit are systematically studied and summarized. The ore body generally appears to be produced along the nearly east-west fracture zone and tends to extend large along the strike, but the mineralization is extremely uneven, the scale of single ore body is not large, and the reappearance of pinnacle is obvious. In the horizontal direction, the mineralization intensity increases from east to west, and the mineralization elements change from gold, silver to gold, copper, lead and zinc, and in the vertical direction, the exploration results and the location of the previous mining areas show that there are two mineralized enrichment zones. In the upper mining area, there are two mineralized enrichment areas around the 800 m elevation and the upper and lower elevation of 550 ~ 700 m. Ore quality is good for easy ore separation. The ore-forming elements of Wenzhang gold deposit are summarized. The main controlling factors of mineralization in Wenzangzi deposit are the Mesozoic gold-bearing formation, the early Yanshanian magmatic system and the ductile-brittle fracture system. The geological data obtained from field observation and the results of metallogenic dating indicate that mineralization mainly occurred in Yanshanian period. Based on the above research, the ore-forming system of Wenzangzi gold deposit is put forward. The authors consider that the metallogenic system model of the Wenzangzi gold deposit is "metallogenic formation of Mesozoic magmatic rocks, accumulation of metasomatic ore-forming materials in thermal fluid and structural localization." According to this metallogenic system, the ductile-brittle fault development area in this area should be an important area to continue prospecting, and the main mineralization type should be altered rock type.
【学位授予单位】:吉林大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:P618.51
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