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

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A12O3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A12O3的相关系数平均值r=-0.62，即负的中等相关；Sc和A/S比值的相关系数平均值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。

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

Based on the study of the bauxite and Sc of Shenjiping mine in the southern Chongqing,The A12O3 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 A12O3,it is a moderate negative correlation.The average of correlation coefficient r=-0.44 between Sc and A/S(Al2O3/SiO2),it is a low negative correlation.The REE distribution patterns suggest that the bauxite of Shenjiping mine has some characteristics as follows: enriched LREE,Ce positive anomalies and Eu negative anomalies.The dependence relation between Sc and ΣREE 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 confined by the environment of sedimentation,likely there are two types of Sc in bauxite: one is isomorph,the other is ion adsorption.