摘要
华北克拉通是我国面积最大、时代最古老的陆块,地质构造演化历史复杂,也是我国重要的铁矿资源分布区。本文在系统总结该区域成矿规律的基础上,利用GIS平台提取了多元成矿有利信息(变质建造、控矿构造、矿致磁异常、氧化铁异常、自然重砂信息)。在此基础上,建立了沉积变质型铁矿床的找矿预测模型,并采用MRAS系统中的证据权模块进行矿产资源定量预测。按照后验概率的大小划分了两级区域有利成矿远景区,分别是冀东、辽东、五台-吕梁三个A级成矿远景区和大青山-色尔能腾山、鲁山-舞阳、鲁西三个B级成矿远景区。这些远景区与已知矿床(点)重叠或比邻,显示远景区具有较好的成矿条件和较大的成矿潜力,应在今后的找矿勘查工作中予以充分重视。
The North China Craton is the largest and oldest block in China, which has complicated geological evolution history. It is the distributive province of the important iron deposits resource. Under the guidance of regional metallogenic regularity, the multisource data sets including metamorphic formations, ore-controlling structure, ore-induced magnetic anomaly, geochemical and natural heavy minerals were extracted with GIS technology. The prospecting model of sedimentary metamorphic iron deposits was built based on it. Then weights for each layer were calculated to identify the posterior probabilities for each cell of the study area under weights of evidence module. According to the posterior probabilities, six prospecting areas were delineated, which were divided into two grades. Three prospecting areas of grade A are eastern Hebei Province, eastern Liaoning Province and Wutai-Lvliang; Three prospecting areas of grade B are Daqingshan-Se＇ eruengtengshan, Lushan-Wuyang and western Shandong Province. Due to the similar metallogenic conditions with the known iron deposits, around the known deposits, these areas still have great metallogenic potential. So they deserve more attention in future mineral exploration.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第7期2606-2616,共11页
Acta Petrologica Sinica
基金
国家重点基础研究发展计划973项目(2012CB416605)资助
关键词
铁矿
沉积变质
时空分布
证据权
华北克拉通
Iron deposit
Sedimento-metamorphic
Temporal and spatial distribution
Evidence weight
North China Craton
