文档介绍：Study on the Subgrade Diseases in Permafrost of Qinghai-Tibet A Dissertation Submitted for the Degree of Master Study on the Metallogenic rules and the model of the Zhaishang Gold deposit, Minxian, Gansu Province Candidate:LiaoYanfu Supervisor:Prof. YanHaiqing Chang’an University, Xi’an, China 摘要寨上金矿床位于西秦岭成矿带北亚带,处于卓落-国营牛场背斜中,分南北两个矿带,矿带赋存于二叠系、泥盆系地层中,总体表现为层间破碎带特点。断裂构造呈北西-北西西向,控制着矿(脉)体的展布方向。本文从流体包裹体特征,同位素、稀土元素地球化学特征入手示踪金成矿物质来源, 表明成矿物质主要来源于深部。分析寨上金矿赋矿地层特点出发,认为地层、岩性对成矿的贡献主要在于赋矿岩性段为砂岩与板岩互层及灰岩、钙质板岩夹泥质板岩,二者的共同特点是一软一硬,对寨上矿区矿脉容矿断裂的发育起着重要控制作用。成矿是在地层、构造、岩浆热液活动等因素的耦合作用下形成的。成矿规律总结为:①矿脉沿背斜转、折处斜列分布;②容矿断裂沿软、硬岩性界面产出,偏向炭质或泥质板岩一侧发育;③金矿化分段富集;④北矿带富矿体呈右行斜列, 南矿带富矿体呈左行斜列;⑤矿体在纵投影图上向西侧伏,或底部界线呈向西倾的波浪状;⑥容矿断裂构造成矿前为左行压扭韧韧性、成矿期转化为右行张扭脆性、成矿后为右行压扭脆性; 寨上金矿断裂构造系统为:Ⅰ级控矿断裂构造为岷县-镇安断裂带,与地幔相通, 为板块二级缝合线构造。Ⅱ级断裂构造为F9、F1断层,寨上金矿即加持于二断裂带之间,为金矿的构造格架。Ⅲ级断裂构造为F3、F5、F8断层,F3、F5控制着北矿带的南北边界,F8为寨上金矿的南边界,是深部物质上升至浅部的重要因素。Ⅳ级断裂主要是矿区内的各条矿脉。四者共同形成矿区导矿、配矿、容矿构造控矿系统。背斜和断裂与成矿的时序演化、配套关系为:卓落—国营牛场背斜隆起和F1断裂带的逆冲推覆改造,形成层间破碎带,为后期成矿流体的灌入、定位提供有利空间;Ⅱ、Ⅲ级断裂构造系统在深部连通,对深部成矿物质上升至浅部起到关键的作用。寨上金矿成矿模型为:成矿物质来源于深部,在深部形成的含矿流体,在构造动力及隐伏岩体侵入等多种地质要素耦合的作用下,沿各级构造控矿系统上升至地壳浅部促成成矿物质的就位,形成寨上金矿。指出寨上矿区的找矿方向:一是要突出深部找矿,其深部具有巨大的找矿潜力;二是要注重南、北矿带延伸部位的找矿,尤其南、北矿带的西延部位,;三是外围找矿靶区为反“S”型卓洛—国营牛场背斜构造的东南转折。关键词:寨上金矿,断裂构造系统,成矿模型,找矿方向 Abstract Zhaishang gold deposit, located in the Zhuoluo-State feedlots anticline in the northern subzone of the western Qinling mineralization belt, hosts inthe interlayered fractured zone,consists of northern and western belts which occur in Permain and Devonian strata. NW and NNW fault control the distribution of ore bodies or veins. On the basis of summing up the characteristics of fluid inclusion, isotope and REE, this paper deals with the source of gold, which indicate that the origins of metallogenic materials are mainly derived from deep. The host rock of the gold deposits are sandstones interbedded with shale and limestone or calcareous slate interrupted by argillaceous slate, which both are hard and sof