赣南足洞特大离子吸附型重稀土矿床地球化学特征及成矿意义  

Geochemical Characteristics and Metallogenic Implications of Extra Large-scale Ion Adsorption Type Heavy Rare Earth Deposit in Zudong, Southern Jiangxi

作　　者：王运 赵碧波 杨兰 胡宝群[1] 高海东 邱林飞[1,3] 何中波 WANG Yun;ZHAO Bi-bo;YANG Lan;HU Bao-qun;GAO Hai-dong;QIU Lin-fei;HE Zhong-bo(School of Earth Science,East China University of Technology,Nanchang 330013,China;College of Energy Industry,Shanxi College of Technology,Shuozhou 036000,China;Beijing Research Institute of Uranium Geology,Bejing 100029,China)

机构地区：[1]东华理工大学地球科学学院,江西南昌330013 [2]山西工学院能源产业学院,山西朔州036000 [3]核工业北京地质研究院,北京100029

出　　处：《稀土》2023年第6期51-63,I0004,共14页Chinese Rare Earths

基　　金：东华理工大学江西省数字国土重点实验室开放研究基金项目(DLLJ202205);东华理工大学博士启动基金(DHBK2019051);江西省重点研发计划项目(20203BBG72W011);江西省地质局科技项目(2021AA07);江西省研究生创新专项资金项目(YC2022-S600)。

摘　　要：对赣南足洞矿床热液蚀变带和风化壳分别进行剖面采样,开展主微量和稀土元素测试分析,研究其地球化学特征。结果发现,热液蚀变和风化作用均能导致花岗岩REE富集,且多为HREE富集。不同类型花岗岩的HREE富集程度从高到低为:热液蚀变花岗岩(LREE/HREE值为0.26~0.40)>风化花岗岩(LREE/HREE值为0.54~0.95)>正常花岗岩(LREE/HREE值为1.30)。HREE含量与其他元素含量相关性分析表明,HREE与MgO呈显著正相关,与U呈弱正相关关系,与Hf呈弱负相关关系,与Th等其他微量元素相关性不明显。本矿床成因可能为广泛发育的热液蚀变形成了HREE富集的蚀变花岗岩,之后经风化作用,长石、云母等矿物形成大量黏土矿物,同时通过黏土矿物吸附作用进一步富集HREE,从而形成了富HREE矿床。The hydrothermal alteration zone and weathering crust of Zudong deposit in southern Jiangxi were sampled respectively, and the geochemical characteristics of the deposit were studied by testing and analyzing the major elements, trace elements and rare earth elements. The results show that both hydrothermal alteration and weathering can lead to REE enrichment in granite, and most of them are HREE enrichment. The HREE enrichment degree of different types of granite from high to low is as follows: hydrothermal altered granite(LREE/HREE value is 0.26~0.40)>weathering granite(LREE/HREE value is 0.54~0.95)>normal granite(LREE/HREE value is 1.30). The correlation analysis of HREE content with other elements shows that HREE has a significant positive correlation with MgO, a weak positive correlation with U, a weak negative correlation with Hf, and no obvious correlation with Th and other trace elements. The deposit may be genesis of altered granites enriched with HREE due to extensive hydrothermal alteration, after weathering, feldspar, mica and other minerals form a large number of clay minerals, and at the same time, the adsorption of clay minerals forms the HREE rich deposit.

关 键 词：重稀土 热液蚀变 地球化学特征 离子吸附型 足洞矿床 

分 类 号：P618.7[天文地球—矿床学]