山东郗山-龙宝山地区与碱性岩有关的稀土矿床地质特征及成因  

Geological Characteristics and Origin of Rare Earth Elements Deposits Related with Alkaline Rock in the Chishan-Longbaoshan Area,Shandong Province

作　　者：于学峰[1,2] 唐好生[3] 韩作振[1] 李长有[3] 

机构地区：[1]山东科技大学地质学院,山东青岛266510 [2]山东省地质博物馆,济南250013 [3]山东省鲁南地质工程勘察院,山东兖州272000

出　　处：《地质学报》2010年第3期407-417,共11页Acta Geologica Sinica

基　　金：山东省矿产资源补偿费项目"苍山县龙宝山地区金矿成矿预测"等资助成果

摘　　要：郗山和龙宝山稀土矿具有相似的成矿地质背景、控矿岩体特征及矿床地质特征。燕山早期碱性侵入岩与稀土矿关系密切,稀土矿体主要赋存于杂岩体内及其附近围岩中;稀土元素和同位素研究表明,含矿质的富碱岩浆可能属壳幔混源型,碱性岩浆及成矿物质最初可能都来源于上地幔同一部位,而在岩浆上侵过程中同化混染了地壳物质。郗山稀土矿为单一富轻稀土矿床,矿脉类型以含稀土石英重晶石碳酸盐脉为主,含稀土矿物以氟碳铈矿和氟碳钙铈矿为主,碳酸铈钠矿和菱钙锶铈矿属国内首次发现。龙宝山稀土矿为稀土、金共生矿,矿脉类型主要为石英脉和硅化角砾岩;含稀土矿物主要有氟碳铈矿、氟碳铈镧矿、氟碳钙铈矿;金矿物有自然金、银金矿等。成矿时代稍晚于岩浆岩形成时代,属中生代燕山晚期;矿床成因类型为碱性岩浆期后中-低温热液稀土矿床。Rare earth deposits in the Chishan and Longbaoshan area have similar geological mineralization background, ore-controlling characteristics and deposit geological characteristics. Alkaline intrusive rock in early Yanshan period is closely related to rare earth elements deposits. Rare earth orebodies occur mainly in complex and country rocks. Study on rare earth elements and isotope results shows that ore-bearing alkaline concentrated magma likely belongs to crust-mantle magma source mixed type, and alkaline magma and ore-forming materials may be derived from the same parts of the mantle, and crust materials were mixed and assimilated in the magma intrusion. Chishan rare earth deposit is a single light REE enriched deposit, with REE-bearing quartz carbonate veins as major ore types. Ore-bearing minerals are dominated by bastnasite and parisite, and Ce-carbonate and Ca-strontianite were firstly discovered in China. Longbaoshan rare earth deposit is characterized by a paragenetic deposit between rare earth and gold ores. Quartz veins and silicified breccia veins are its major vein types; rare-earth bearing minerals are composed mainly of bastnaesite, Ce- and La-bearing bastnasite, and parisite. Gold minerals include native gold and silver gold. Ore-forming period was later than that of the formation of igneous rocks and belongs to late Mesozoic Yanshan period. The genesis of deposit is low or medium temperature alkaline magmatic hydrothermal rare earth deposit.

关 键 词：稀土矿床 碱性岩 地质特征 壳幔混源 山东郗山 

分 类 号：P618.7[天文地球—矿床学]