论文部分内容阅读
根据REE含量及其分配模式 ,华中超高压变质带中榴辉岩可大体分为六种类型 ,即LREE富集型、LREE富集 +Eu正异常型、LREE富集 +Eu负异常型、REE平坦型、MREE(中稀土 )富集型和HREE富集型 ,主要为LREE富集型和LREE富集 +Eu正异常型 ,不同地区榴辉岩REE类型可进行对比 ,不同地区同REE类型榴辉岩的REE特征相似。原岩恢复结果表明榴辉岩的原岩主要为来源于相对富集地幔的大陆拉斑玄武岩及其结晶分异产物 ;LREE富集型、LREE富集 +Eu正异常型、LREE富集 +Eu负异常型榴辉岩原岩之间和REE平坦型、MREE富集型榴辉岩原岩之间具有较好的演化关系 ,前三者产于大陆环境 ,后二者相对靠近大洋环境 ;同时也可得出榴辉岩原岩的源区地幔具有不均匀性及原岩遭受过地壳物质混染等结论
According to REE content and its distribution pattern, the eclogites in the UHZ metamorphic belt can be divided into six types: LREE enriched, LREE enriched + Eu positive anomalous, LREE enriched + Eu anomalous, REE Flat, MREE (middle rare earth) enrichment and HREE enrichment, mainly LREE enrichment and LREE enrichment + Eu positive anomaly type, eclogite REE types can be compared in different areas, different regions with the REE type The REE characteristics of pyroxene are similar. The results of the original rock restoration show that the protoliths of the eclogite are mainly continental tholeiites and their crystalline differentiation products derived from relatively enriched mantle; LREE-enriched, LREE-enriched + Eu-anomaly, LREE-enriched + Eu The negative anomaly eclogite protoliths have good evolutionary relationship with the REE flat and MREE-rich eclogite protoliths. The first three are produced in the continental environment, and the latter two are relatively close to the ocean environment. It is concluded that the source mantle of the eclogite source rock is inhomogeneous and the original rock is contaminated by the crustal material.