鲁中隆起区中北部矽卡岩型铁矿成矿预测

Metallogenic prediction of skarn iron deposits in the central and northern Luzhong uplift,East China

鲁中隆起区中北部地区矽卡岩型铁矿成矿地质条件优越,其含矿建造分布于济南、莱芜、淄博及其周邻地区。简要介绍了研究区的区域地质背景、地球物理特征;详细阐述了区内控矿地质条件,发现该区矽卡岩型铁矿具有地层、岩浆岩和构造联合控矿的特点,其中奥陶纪碳酸盐地层、燕山晚期中基性侵入岩体是区内主要控矿要素,在背斜的转折端和构造交汇处易于形成规模较大的矿体。区内铁矿的预测依据主要为地层、构造、岩浆岩、物探异常和代表性矿床。在此基础上,对该类型铁矿进行了成矿预测,共划分了济南、莱芜等5个成矿区,同时划分出除济南地区之外的9个铁矿找矿靶区,为研究区未来的铁矿勘查工作提供了依据。

The central and northern areas of Luzhong uplift were of superior metallogenic geological conditions for the formation of skarn iron deposits, and their ore-bearing formation is mainly distributed in Ji＇nan, Laiwu, Zibo and the adjacent areas. On the basis of a brief introduction of the regional geological setting and geophysical characteristics, the work elaborated the ore-controlling conditions. It is suggested that these skarn type iron deposits show a joint control by strata, magmatic rocks and structures, of which the Ordovician carbonate formation and the Late Yanshanian intermediate-basic intrusive rocks are the main ore-controlling factors. Large ore bodies tend to form at the turning point of anticlines and the intersection of structures. This type of iron deposits was formed in the Late Yanshanian period. The prediction evidence of iron deposits in this area is mainly strata, structure, magmatic rocks, geophysical anomaly and typical deposits. Above all, this study conducted metallogenic prediction of this type of iron deposits. A total of five metallogenic areas were delineated including Ji＇nan and Laiwu, and nine prospecting target areas except Ji＇nan area were also determined. This work may provide important basis for the future iron ore exploration in this region.