摘要:
山东省地处中国东部, 经历了漫长地质演化历史, 分为鲁西和鲁东2 个主要地块, 地质矿产具有各自鲜明的特征; 其中区内铁矿成矿地质条件优越, 成因类型多样, 矿床广泛分布, 资源储量丰富, 是全国重要的铁矿开发基地。本次研究旨在通过对全省地质矿产资料进行总结, 从地层赋矿、构造控矿、岩浆岩成矿和物探异常示矿等方面对全省铁矿成矿规律进行分析, 进一步对全省铁矿资源潜力进行研究。研究表明全省铁矿类型共分苍峄式、莱芜市、莲子汪式、朱崖式等共14 个矿床式; 铁矿成矿规律研究表明, 各铁矿类型受到地质构造演化控矿、地层控矿、岩体控矿、构造控矿等控制程度不同; 如地层控矿方面尤以沉积变质型、化学沉积型较为突出, 岩体控矿方面尤以岩浆型铁矿最为显著, 而接触交代型铁矿则是地层控矿、岩体控矿、构造控矿联合作用的结果。随着深部找矿工作的持续推进, 认真总结物探异常示矿规律是今后勘查工作的重点, 低缓磁异常区的勘查是取得重大进展的关键。通过对全区铁矿的时空分布特征对比分析和成矿规律研究, 划分了全省铁矿成矿系列, 并总结了综合找矿预测模型; 构建了研究区铁矿综合勘查技术体系。此次研究共圈定了苍峄铁矿远景区、莱芜铁矿远景区、淄河铁矿远景区和莱阳西铁矿远景区等36 处; 其中沉积变质型铁矿共15 处, 接触交代型铁矿共9 处, 岩浆热液型铁矿共4 处, 岩浆型铁矿共8 处; 在上述36 处远景区中, A 类远景区共18 处, B 类远景区共13 处, C 类远景区共5 处, 在今后各个铁矿类型勘查过程中, 沉积变质型铁矿和接触交代型铁矿是今后勘查工作的重点。本次研究为今后全省铁矿找矿工作提供了部署依据和勘查方向。
Abstract:
Shandong Province is located in the east of China and has experienced a long history of geological evolution. It is divided into two main blocks of western Shandong and eastern Shandong. The geology andmineral resources have their own distinct characteristics. Among these, the iron ore-forming geological conditions in the area are superior, the genetic types are diverse, the deposits are widely distributed, and the resources reserves are abundant. It is an important iron ore development base in China. The purpose of this study is to summarize the geological and mineral data of the province, analyze the iron metallogenic regularity of the province from the aspects of stratigraphic ore-hosting, structural ore-controlling, magmatic ore-forming and geophysical anomaly prospecting, and further study the iron ore resource potential of the province. This study found that the iron ore types in the province are divided into 14 ore deposit types, including Cangyi type, Laiwu type, Lianziwang type, and Zhuya type, etc. The study on the metallogenic regularity of iron ore showed that each type of iron ore is controlled by geological structure evolution, strata, magmatic rock and structure; For example, in terms of strata ore-controlling, sedimentary metamorphic type and chemical sedimentary type are more prominent; in terms of magmatic rock ore-controlling, magmatic type iron ore is the most prominent; while contact metasomatic type iron ore is the result of the combined ore-controlling of strata, magmatic rock and structure. With the continuous advancement of deep prospecting, the focus of future exploration work is to summarize geophysical anomalies prospecting carefully, and the exploration of low slow magnetic anomaly areas is the key to making great progress.Based on the comparative analysis of the temporal and spatial distribution characteristics of iron ore in the whole region and the study of metallogenic regularity, the metallogenic series of iron ore in the whole province are divided, and the comprehensive prospecting prediction model was summarized. The study established a comprehensive iron ore exploration technology system in the study area. The study has delineated 36 iron ore prospecting areas, including Cangyi iron ore prospecting area, Laiwu iron ore prospecting area, Zihe iron ore prospecting area and Laiyang West iron ore prospecting area; Among them, there are 15 sedimentary metamorphic type iron ores, 9 contact metasomatic type iron ores, 4 magmatic hydrothermal type iron ores and 8 magmatic type iron ores. There are 18 class A prospecting areas, 13 class B prospecting areas and 5 class C prospecting areas in the 36 iron ore prospecting area above. In the future exploration of various iron ore types, sedimentary metamorphic iron ore and contact metasomatic iron ore are the focus of future exploration. This study provides the deployment basis and exploration direction for the future iron ore prospecting work in the province.