【作者】 申伍军；

【导师】 王学求；

【作者基本信息】 中国地质科学院 ， 地球化学， 2011， 博士

【摘要】 内蒙古自治区区域地质条件优越,但工作程度相对较低。论文以内蒙1：20万区域化探和1：100万中蒙边界地球化学填图数据为基础,建立已知大型火山热液型多金属矿和斑岩型铜矿地球化学指标特征,并对未知区开展大型矿预测。主要取的认识和成果如下：1、利用1：20万的区域化探扫面数据和1：100万的中蒙边界填图数据,使用Geoexpl软件进行了数据的调平处理,采用指数加权的方法进行了网格化,并用累频的方法制作了1：100万和1：20万两个尺度地球化学图件312张。2、统计研究表明,几乎所有的大型矿(矿集区)都位于地球化学省内,绝大部分的大、中型矿都位于区域地球化学异常内。研究表明充分的成矿物质来源是成矿作用发生的第一要素,充足的物质供应是构成大型、超大型矿床形成的必要物质基础。3、通过对拜仁达坝-维拉斯托-银都银铅锌大型矿集区、额仁陶勒盖-查干布拉根-甲乌拉大型银铅锌矿集区、小营子-黄谷屯铅锌银矿集区的对比研究,建立了大型热液型多金属矿地球化学预测指标。(1)具有多层套合异常结构,即地球化学省、区域异常和局部异常。(2)地球化学省异常面积大于500 km2,大部分异常面积大于1000 km2；单元素Ag、Pb和Zn区域异常面积大于100km2。(3)预测区的主成矿元素NAP值(标准化面金属量=异常区元素的平均值比上背景值再乘以异常面积)一般大于1000,个别受采样介质影响的大于500。(4)异常强度(异常内元素平均含量/背景含量)大于1.5；(5)银多金属矿具有Pb, Zn, Ag,Cu特定的多金属元素套合标志,并且至少具有3个以上元素异常相套合；(6)具有热液活动有关的间接指示元素As、Sb和Hg的元素组合和与指示矿源层有关的V、Co、Fe2O3、Ti等元素组合。4、通过对乌奴格吐山大型斑岩型矿床和白乃庙大型斑岩型矿床的地球化学指标特征研究,建立了大型热液型多金属矿地球化学预测指标。(1)具有明显的Cu、Mo和Ag元素组合；(2)单元素Cu、Mo和Ag的区域异常面积大于100km2；(3)单元素富集系数大于1.8；(4)伴生有与中酸性岩浆活动有关的K2O、SiO2、Y、Th、Nb、La和U等元素组合。5、根据在已知区大型矿集区建立的地球化学指标,结合区域地质、大地构造和成矿条件,共圈定了1：100万尺度银铅锌地球化学综合异常31处；1：20万尺度银铅锌地球化学综合异常1533处,其中符合已建立的大型热液型银多金属矿床地球化学标志的异常12处。1：100万尺度大型铜金地球化学综合异常253处,1：20万尺度的铜金钼地球化学综合地球化学异常2115处,其中其中符合已建立的大型斑岩型铜金钼矿床地球化学标志的异常5处。更多还原

【Abstract】 Geologically, Inner Mongolia is great potential for mineral resources. Based on the Regional-Geochemistry National Reconnaissance project data and the Sino-Mongolian Boundary Geochemical Mapping project data, the Geochemical Indicators are established to predict large-sized Ag-Pb-Zn polymetallic deposits and porphyry copper-gold deposits. Potential resources are predicted based on the indicators. The main results are as following:1. On the GIS platform of Geoexpl,312 geochemical maps have been produced using Weighted index method grid Cumulative frequency method.2 Statistical studies show that almost all of the large ore deposits are located in the geochemical provinces, most of the large and medium-sized deposits are hosted by the regional geochemical anomalies. This fact shows that a huge amount of element acumulation is adequate sources for formation of large-sized deposits.3. Based on the known large-sized deposits of Bairendaba-weilasituo-yindou, Erentaolegai-chaganbulagen-jiawula and Xiaoyinzi-Huanggutui polymetallic ore districts, geochemical indicators for large-sized Ag-Pb-Zn pollymetallic deposits are hierarchical geochemical patterns including geochemical province, regional and local anomalies hosting a large-sized ore deposit, an area of a geochemical province and a regional anomaly larger than 500km2 and 100 km2 respectively, enrichment coeffecientindex greater than 1.5, normalized areal productivity (NAP) larger than 1000, direct indicators of associated elements of Ag, Pb and Zn to ore forming, indirect indicators of As, Sb and Hg to hydrothermal activity and V, Co, Fe2O3, Ti to source bed.4 Based on large-sized Wunugetushan and Bainaimiao porphyry copper deposits, geochemical indicators are as follows:element association of Cu, Mo and Ag, anomalous area larger than 100 km2, enrichment coefficient greater than 1.8, associated elements of K2O、SiO2、Y、Th for mineralization environments related to pophyry intrusions.5 At a scale of 1:1000000,31 anomalies promising for silver-lead-zinc polymetallic ore deposits were delineated and 253 anomalies of Cu-Au-Ag were delineated and at a scale of 1:200000,1533 Ag-Pb-Zn anomalies were delineated. Among these,12 anomalies are consistent with geochemical indicators to large-sized Ag-Pb-Zn ore depsots.2115 anomalies of Cu-Au-Ag were delineated and 5 areas consistent with geochemical indicators to large-sized porphyry ore deposits.更多还原