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| 冀北赤城退变榴辉岩的岩石地球化学及原岩恢复 | |
| 引用本文： | 周兵,张成江,倪志耀.冀北赤城退变榴辉岩的岩石地球化学及原岩恢复[J].四川地质学报,2008,28(4):339-341. |
| 作者姓名： | 周兵 张成江 倪志耀 |
| 作者单位： | 1. 成都理工大学地球化学系,成都,610059;四川省核工业地质调查院,成都,610061 2. 成都理工大学地球化学系,成都,610059;成都理工大学地球科学学院,成都,610059 3. 成都理工大学地球科学学院,成都,610059 |
| 基金项目： | 国家自然科学基金 |
| 摘 要： | 冀北赤城退变榴辉岩主元素特征显示所有样品均属拉斑玄武岩系列，可分出三种不同的REE配分型式。在MORB标准化微量元素配分图中，LREE亏损型与REE平坦型样品的HFSE与MORB相似，LREE富集型样品则具有较高的Zr、Hf和Y值，Nb和Ta明显富集，显示出陆壳物质混染的特征。这些特征表明，冀北赤城退变榴辉岩的原岩可能为兼具洋中脊和岛孤地球化学属性的洋壳拉斑玄武岩类，在后期俯冲消减过程中，发生榴辉岩相高压变质作用，并混入了部分陆壳物质。 |
| 关 键 词： | 退变榴辉岩 洋壳拉斑玄武岩 陆壳混染 岩石地球化学 冀北赤城 |
Geochemistry and Protolith of the Retrograded Eclogite in Chicheng, North Hebei |
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| ZHOU Bing,ZHANG Cheng-jiang,NI Zhi-yao.Geochemistry and Protolith of the Retrograded Eclogite in Chicheng, North Hebei[J].Acta Geologica Sichuan,2008,28(4):339-341. | |
| Authors: | ZHOU Bing ZHANG Cheng-jiang NI Zhi-yao |
| Institution: | ZHOU Bing, ZHANG Cheng-jiang, NI Zhi-yao (1.Department of Geochemistry, Chengdu University of Technology, Chengdu 610059; 2.College of Earth Sciences, Chengdu University of Technology, Chengdu 610059; 3. Sichuan Institute of Geological Survey for Nuclear Industry, Chengdu 610061) |
| Abstract: | The retrograded eclogite from Chicheng, north Hebei is associated with biotite plagiogneiss in the Paleoproterozoic Hongqiyingzi Group. The major element geochemistry for the eclogite is characterized by oceanic tholeiite. REE geochemistry of the eclogite is characterized by 3 REE distribution patterns. HSFE for the eclogite with depletion in LREE and normal REE are similar to those for MORB, while the eclogite with enrichment in LREE is characterized by rich in Zr, Hf, Y, Hb and Ta, indicating continental crust contamination. These suggest that the protolith of the eclogite might be oceanic tholeiite contaminated with continental crust. |
| Keywords: | retrograded eclogite oceanic tholeiite continental crust contamination lithogeochemistry Chicheng north Hebei |
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