齐河—禹城地区矽卡岩型铁矿找矿预测地质模型

Geological Model for Prospecting and Prediction of Skarn Type Iron Deposits in Qihe—Yucheng Area

摘要:

近年来，山东省齐河—禹城地区矽卡岩型铁矿找矿预测和科学研究工作取得了重大进展。山东省相关地勘单位在对该区地质—地球物理场和成矿规律研究的基础上，对李屯次级磁异常、大张次级磁异常、潘店次级磁异常成矿有利部位进行了异常查证工作；相继发现了“厚度较大、品位较高、分布集中”的矽卡岩型铁矿床，为系统研究该区地质特征、地球物理异常、铁矿成矿规律等提供了资料基础和勘查经验。该文通过对区域地质特征、矿区地质—地球物理特征及铁矿床特征分析，探讨了该区矽卡岩型铁矿的控矿要素及成矿后期构造运动对该区铁矿床的改造作用。在“三位一体”勘查区找矿预测理论的基础上，该次研究工作建立了包括成矿地质背景、成矿地质体、成矿构造、成矿作用特征标志、物探特征等方面的找矿预测地质模型；同时提出了研究区今后铁矿勘查工作中需重点解决的地质问题，以期促进今后相关地区矽卡岩型铁矿勘查工作。

Abstract:

In recent years, great progresses have been made in prospecting prediction and scientific research of skarn type iron deposits in Qihe—Yucheng area in Shandong province. Based on the study of geology, geophysical field and metallogenic regularity in study area, anomaly verification work have been carried out on the favorable metallogenic positions of Litun secondary magnetic anomaly, Dazhang secondary magnetic anomaly and Pandian secondary magnetic anomaly. The skarn type iron deposits with large thickness, high grade and concentrated distribution have been discovered successively. It will provide the data basis and exploration experience for studying geological characteristics, geophysical anomalies and iron ore metallogenic regularities of the area systematically. Through analyzing regional geological characteristics, geological and geophysical characteristics of the mine and characteristics of iron deposits, the ore-controlling factors of skarn type iron deposits and the transformation of iron deposits by tectonic movements in the late metallogenic period in this area have been studied. On the basis of prospecting and prediction theory in "metallogenic geological body, metallogenic structure, characteristics of metallogenesis ", a prospecting and prediction geological model has been established, including metallogenic geological background, metallogenic geological body, metallogenic structure, characteristics of metallogenesis and geophysical characteristics. Key geological problems which need to be solved in iron ore prospecting work in the study area have been put forward in order to promote the prospecting of skarn type iron deposit in relevant areas in the future.