摘要
文章分析了庐枞北部火山-次火山成矿作用过程中稀土元素的分异特征,将该区火山-次火山气液型矿床的主要矿石矿物的稀土配分模型分为3种类型:平坦型、跳跃型和倾斜型;同时还分析了龙桥铁矿床稀土元素分异的定向性演化特征,即成矿由早阶段到晚阶段,随温度的降低,稀土元素的演化趋势是向Eu负异常增大和轻/重稀土元素比值降低的方向进行,稀土配分曲线由倾斜趋于平缓。
Based on the geochemical study of the rare earth element(REE) of four deposits in the northern area of Lujiang-Zongyang basin of Anhui Province, the differential characteristics of REE in the process of volcanic-subvolcanic metallogenesis are analyzed, the chondrite-normalized REE patterns of main ore minerals in the deposits are classified as three types—the smooth type,the jump type and the inclination type. Directional evolution features of REE differentiation of main minerals from the Longqiao deposit are also analyzed,and it is found out that from the earlier metallogenetic stage to the later stage,the overall trend is in the direction that the Eu negative anomaly enhances and the ∑Ce-∑Y ratio reduces and chondrite-normalized REE patterns change from inclination to smoothing with the lowering of ore-forming temperature.
出处
《合肥工业大学学报(自然科学版)》
CAS
CSCD
2003年第6期1222-1226,共5页
Journal of Hefei University of Technology:Natural Science
关键词
稀土元素
稀土配分曲线
庐枞盆地
分异特征
矿床
成矿预测
volcanic-subvolcanic metallogenesis
rare earth element(REE)
differentiation
northern Lujiang-Zongyang basin