环渤海地区铁矿资源特征及远景分析

Geological Character and Prospective Analysis of the Iron Ore Resources in Circum-Bohai-Sea Region

环渤海地区是中国铁矿资源重要产地、铁矿石主要开采区和中国钢铁生产的重要分布区。区内铁矿查明资源储量297.15亿吨,占中国总查明资源储量48.95%。区内各省市的铁矿资源分布极不均匀,以辽宁、河北、山西等省铁矿资源最为集中,查明资源储量达235.25亿吨,占环渤海地区铁矿查明资源储量79.16%。区内矿床类型较为齐全,主要的有条带状铁建造(BIF)型铁矿床、接触交代型铁矿床、岩浆型铁矿床、复合成矿作用型铁矿床、沉积型铁矿床、热液型铁矿床、海相火山岩型铁矿床,其中以BIF型铁矿床最为重要,其资源储量占全区总资源储量84.8%,其次为接触交代型铁矿床,资源储量占全区总资源储量6.02%。本区铁矿床从太古宙到新生代都有产出,但不同地质时期矿床类型和规模不尽相同,并与地壳演化的特征紧密相关。太古宙是区内最重要的地质时期,该时期形成铁矿资源储量占总资源储量78.06%。其次为元古宙和中生代,资源储量分别占总资源储量的14.84%和6.90%。区内铁矿资源寻找的主要类型是BIF型铁矿床,其次是接触交代型铁矿床。除上述两个主要类型外,各省根据本地具体情况,对其它类型,如河北岩浆型大庙式,山东热液型朱崖式铁矿等,进行地质找矿。本区铁矿有较大的远景。

The Circum-Bohai-Sea region is a important district rich in iron ore resources, a mining area of iron ore and a significant distribution area of iron and steel industry in China. There is 29.715 Gt iron ore reserves in the Circum-Bohai-Sea region, occupied 48.95% of the total iron resources in China. The iron ore resources, which are very uneven distribution in the provinces and municipalities of this region, are mainly concentrated in the Liaoning, Shanxi and Hebei Provinces, and there is 23.525 Gt iron ore reserves, occupied 79.16% of the total iron resources in the Circum-Bohai-Sea region. The iron ore-deposit types in this area are more complete, including banded iron formation type （BIF）, contact metasomatic type, magmatic type, complex mineralization type, sedimentary type, hydrothermal type and marine volcanic type, in which the banded iron formation iron ore deposits （BIF） are the most important, occupied 84.8% of the region＇s total resource reserves, followed by the contact metasomatic iron ore deposits, occupied 6.02% of the total. The iron deposits in this area appear from Archean to Cenozoic, the types and scales of which differ from each other in the different geological period, and closely with the crustal evolution. Archean is the most important geological period, in which the iron ore resources occupy 78.06% of the total in this area, followed by Proterozoic and the third is Mesozoic, the iron ore resources are occupies 14.84% and 6.90% of the total respectively. Iron hunting in this area are maily BIF iron ore deposit and contact-metasomatic iron ore deposit. Besides these two main types, according to the local circumstances of the provinces, we should carry on the geological prospecting to other types, such as magmatic type of Hebei Damiao,hydrothermal type of Shandong Zhuya. The iron ore resources in this area have great potentiality.