山东省龙宝山地区稀土矿成矿地质特征及找矿前景分析

Analysis on Metallogenic Geological Characteristics and Prospecting Prospects of Rare Earth Deposits in Longbaoshan Area in Shandong Province

摘要:

龙宝山地区是山东省重要的稀土矿找矿靶区,1960年，地质部地球物理探矿局航测大队902队在开展1∶10万山东省中部及东部地区航空磁法及放射性测量中，在兰陵县龙宝山一带圈定了航空放射性异常（Г1860）1处，异常中心明显，规模大，放射性强度高，异常形态好，是稀土找矿的重要靶区。区内中生代燕山期碱性岩浆岩发育，形成龙宝山杂岩体，NW向、NE向、近SN向、近EW向构造发育、放射性异常突出，圈定有La,Y,Th等地球化学异常和独居石、钍石异常，矿化蚀变标志较多，发现11个稀土矿体，综合分析区内稀土找矿前景较好。本文通过对龙宝山地区成矿地质背景、地球物理特征、矿体特征、矿石质量、围岩蚀变等分析，总结了龙宝山地区稀土找矿标志、矿床成因和成矿模式，对该区找矿前景进行分析，为今后龙宝山地区稀土矿勘查提供借鉴作用。

Abstract:

Longbaoshan area is an important rare earth ore prospecting target area in Shandong province.In 1960,during carring out the aeromagnetic method and radioactivity measurement with the scale of 1∶100000 in central and eastern region in Shandong province by No.902 team of aerial brigade of geological geophysical prospecting bureau, one aeroradioactive anomalies (Г1860) has been circled in Longbaoshan area. The anomaly center is obvious with large scale and high radioactivity. The abnormal shape is good. It is an important target area for propecting rare earth deposit. Mesozoic Yanshan epoch alkaline magmatic rocks developed well, and formed Longbaoshan miscellaneous rock mass. Structures with the trend of NW, NE, nearly SN and nearly EW developed, and radioactive anomaly is outstanding. Geochemical anomalies, such as La, Y and Th, and monazite thorium stone anomalies have been circled. Mineralization alteration marks are more, 11 rare earth ore bodies have been found. It is regarded that rare earth ore prospect in the area is good through comprehensive analysis. Through analysis on geological background of oreforming, geophysical characteristics, characteristics of ore bodies, ore quality and alteration of wall rocks in Longbaoshan area, prospecting criteria, genesis of ore deposits and metallogenic prospecting model, prospecting prospect in Longbaoshan area has been analyzed. It will provide references for rare earth ore exploration in the future.