渝南申基坪铝土矿矿区钪的分布规律及地球化学特征研究  

Regularities of Distribution and Geochemical Characteristics of Sc in Bauxite of Shenjiping Mine,Southern Chongqing

作　　者：李军敏[1] 丁俊[1] 尹福光[1] 廖朝贵[1] 陈阳[1,2] 吕涛[1] 陈莉[1] 

机构地区：[1]成都地质矿产研究所,成都610082 [2]中国地质科学院,北京100037

出　　处：《沉积学报》2012年第5期909-918,共10页Acta Sedimentologica Sinica

基　　金：西南地区矿产资源潜力评价(编号:1212010813035)成矿地质背景子课题;渝东地区地质构造演化及铁铝基地研究(编号:1212011085167);重庆市大佛岩;吴家湾;申基坪铝土矿区铝土矿伴生钪;锂;镓综合评价项目共同资助

摘　　要：通过对渝南申基坪矿区四个典型钻孔中铝土矿(岩)和稀散元素钪的研究,发现A12O3主要分布在含矿层位的中上部和中部,其矿石类型主要为土豆状、砾屑状和致密块状,Sc主要分布在含矿层位的中下部和下部,主要赋存的岩石类型为黏土岩和铝土岩。Sc和A12O3的相关系数平均值r=-0.62,即负的中等相关;Sc和A/S比值(Al2O3/SiO2)的相关系数平均值r=-0.44,即负的弱相关;四个钻孔Sc和∑REE平均值r=0.285,为正的弱相关。稀土元素分布模式表明,申基坪矿区绝大多数铝土岩具有富集LREE、Ce正异常和Eu负异常的特征。铝土矿及其伴生元素Sc可能来自下伏地层的碎屑岩和铝硅酸盐岩类,铝土矿和钪的迁移、富集和演化均受到当时的海陆交互沉积环境的制约,铝土矿中的钪很可能有两种存在方式:类质同象和离子吸附。Based on the study of the bauxite and Sc of Shenjiping mine in the southern Chongqing, The A12 03 was found distributing mainly in the middle-upper and middle place, the main type of bauxite are argillaceous, pisolitic, ruditel and tight. The Sc was found distributing mainly in the middle-under and under place, the main type of bauxite are claystone and bauxite. The average of correlation coefficient r = -0.62 between Sc and A1203 ,it is a moderate negative correlation. The average of correlation coefficient r = -0.44 between Sc and A/S（ AI203/SiO2 ） , it is a low negative correlation. The REE distribution patterns suggest that the bauxite of Shenjiping mine has some characteris- tics as follows： enriched LREE, Ce positive anomalies and Eu negative anomalies. The dependence relation between Sc and EREE of each drill hole is remarkable, and the average is a low degree of positive correlation. Bauxite and Sc may come from the aluminosilicate rocks, The migration, enrichment and evolution of bauxite and Sc have been con- fined by the environment of sedimentation, likely there are two types of Sc in bauxite ： one is isomorph, the other is ion adsorption.

关 键 词：钪 稀散元素 铝土矿 分布规律 渝南申基坪矿区 

分 类 号：P618.73[天文地球—矿床学]