山东莱芜—淄博地区稀土矿成矿规律及找矿前景

Analysis on Metallogenic Regularity and Prospecting Prospects of Rare Earth Deposits in Laiwu—Zibo Area in Shandong Province

摘要:

山东莱芜—淄博地区位于华北克拉通东缘，构造活动强烈，岩浆作用频繁，具有良好的成矿地质背景，是我国近年来稀土找矿的重要潜在区域之一。然而，关于该区稀土矿化的物质来源、成矿机制及成矿时代仍存在较大不确定性。本研究在全面收集分析以往各类地质资料基础上，采用地质测量、物探、槽探和采样分析测试等综合勘查手段，大致确定矿(化)体的分布与产出特征、矿石质量特征，分析总结了研究区碳酸岩型稀土矿成矿条件、成矿规律，研究认为本区稀土矿均为与中生代燕山晚期碳酸岩有关的岩浆热液型轻稀土矿床，与稀土矿成矿关系较密切的侵入岩主要为中生代腰关单元斑状蛭石化含磷灰石云母岩、鹿野单元碳酸岩，并圈定胡家庄东南峪、北岭子南双王以及栾宫南王庄等3处稀土矿找矿靶区。

Abstract:

Laiwu—Zibo area in Shandong province is located at the eastern margin of the North China Craton. Tectonic activities are strong, magmatic activities are frequent, and geological background for mineralization is favorable. It is one of the critical potential zones for rare earth element exploration in China in recent years. However, there is still significant uncertainty regarding the material sources, mineralization mechanisms, and mineralization ages of rare earth mineralization in this area. On the basis of comprehensive collection and analysis of various geological data in the past, by using geological surveying, geophysical exploration, trenching and sampling analysis testing, distribution and output characteristics of mineral (mineralized) bodies, as well as the quality characteristics of ores have been roughly determined, and the mineralization conditions and laws of carbonate rock type rare earth deposits in the research area have been analyzed and summarized. It is believed that rare earth deposits in this area are all magmatic hydrothermal light rare earth deposits related to carbonate rocks of late Yanshan period in Mesozoic era. The intrusive rocks closely related to rare earth mineralization are mainly porphyritic vermiculite containing apatite mica rock in Mesozoic Yaoguan unit and carbonate rock in Luye unit. Three rare earth mineral exploration target areas have been circled, they are HujiazhuangDong'nanyu exploration target area, BeilingziNanshuangwang exploration target area and LuangongNanwangzhuang exploration target area.